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Transition Metal Chemistry - published by
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... is an international journal dealing with all aspects of the preparation of transition metal-based compounds of all kinds, their structural, physical, kinetic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems and more.
Aktuelle wissenschaftliche Fachartikel der
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Six Cu(II) complexes of Schiff base ligands of arylidene-2-(4-(4-bromo/methoxy-phenyl)thiazol-2-yl) hydrazines have been synthesized,
characterized and screened for DNA cleavage and antimicrobial activities. The chemical structures of the complexes were deduced
by physicochemical and spectroscopic methods. Elemental analyses indicated that the stoichiometry of the complexes is CuL2 (L = Schiff base ligand). The DNA cleavage activities of the complexes were evaluated by agarose gel electrophoresis in the
presence and absence of oxidant (H2O2) and free radical scavenger (DMSO). All the six complexes showed significant nuclease activity in the presence of H2O2, and two of the complexes showed moderate nuclease activity even in the absence of oxidant. The complexes did not show nuclease
activity in the presence of free radical scavenger. The compounds were tested for activity against selected bacteria and fungi.
Content Type Journal Article
DOI 10.1007/s11243-010-9412-8
Authors
Sanjay K. Bharti, Department of Pharmaceutics, Institute of Technology, Banaras Hindu University (BHU), Varanasi, 221005 India
Saurabh K. Patel, Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University (BHU), Varanasi, 221005 India
Gopal Nath, Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University (BHU), Varanasi, 221005 India
Ragini Tilak, Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University (BHU), Varanasi, 221005 India
Sushil K. Singh, Department of Pharmaceutics, Institute of Technology, Banaras Hindu University (BHU), Varanasi, 221005 India
The kinetics of the interaction of glycine-l-leucine (Glyleu) with cis-[Pt(cis-dach)(OH2)2]2+ (dach = 1,2-diaminocyclohexane) has been studied spectrophotometrically as a function of [cis-[Pt(cis-dach)(OH2)2]2+], [Glyleu] and temperature at pH 4.0, where the complex exists predominantly as the diaqua species and Glyleu as a zwitterion.
The substitution reaction shows two consecutive steps: the first is the ligand-assisted anation and the second is the chelation
step. The activation parameters for both the steps were evaluated using Eyringās equation. The low ∆H1ā (51.9 Ā± 2.8 kJmolā1) and large negative value of ∆S1ā (ā152 Ā± 8 JKā1molā1) as well as ∆H2ā (54.4 Ā± 1.7 kJmolā1) and ∆S2ā (ā162 Ā± 5 JKā1molā1) indicate an associative mode of activation for both the aqua ligand substitution processes.
Content Type Journal Article
DOI 10.1007/s11243-010-9411-9
Authors
Parnajyoti Karmakar, Department of Chemistry, The University of Burdwan, Burdwan, 713104 India
Subhasis Mallick, Department of Chemistry, The University of Burdwan, Burdwan, 713104 India
Biplab K. Bera, Department of Chemistry, The University of Burdwan, Burdwan, 713104 India
Arup Mandal, Department of Chemistry, The University of Burdwan, Burdwan, 713104 India
Subala Mondal, Department of Chemistry, The University of Burdwan, Burdwan, 713104 India
Sudip K. Mukhopadhyay, Department of Chemistry, Asansol B.B.College, Asansol, 713303 India
Alak K. Ghosh, Department of Chemistry, The University of Burdwan, Burdwan, 713104 India
The polymer-anchored Schiff base complexes of Cu(II), Co(II), Ni(II), Mn(II) and Fe(III) were prepared by reacting polystyrene
amine with 2-pyridinecarbaldehyde followed by loading of metal atom in methanol. These complexes were characterized by using
different physico-chemical and spectroscopic methods. The catalytic activity of these polymer-supported metal catalysts was
tested for the oxidation of various olefins and alcohols. Influence of various reaction parameters, such as reaction temperature,
reaction time, oxidant, substrate-to-oxidant mole ratio and nature of solvent, was studied for the oxidation of cyclohexene
with these catalysts. Among the catalysts studied, Cu-Cat showed higher catalytic activity toward oxidation reactions than
the other catalysts. Moreover, hot filtration experiments proved that these catalysts are truly heterogeneous and can be reused
a number of times without significant loss of activity.
Content Type Journal Article
DOI 10.1007/s11243-010-9409-3
Authors
S. M. Islam, Department of Chemistry, University of Kalyani, Kalyani, Nadia, WB 741235, India
Paramita Mondal, Department of Chemistry, University of Kalyani, Kalyani, Nadia, WB 741235, India
Kazi Tuhina, Department of Chemistry, B.S. College, S-24 P.G.S., Canning, WB 743329, India
Anupam Singha Roy, Department of Chemistry, University of Kalyani, Kalyani, Nadia, WB 741235, India
Dilder Hossain, Department of Chemistry, University of Kalyani, Kalyani, Nadia, WB 741235, India
Sanchita Mondal, Department of Chemistry, University of Kalyani, Kalyani, Nadia, WB 741235, India
The Ni(II) complexes [Ni(L)2](ClO4)2 (1) and [Ni(L)2(NO3)2] (2), where L is the Schiff base ligand of 4,5,9,13,14-pentaaza-benzo[b] triphenylene, were synthesized and characterized by
physico-chemical and spectroscopic methods. Nano-sized particles of (1) were prepared both by sonochemistry (3) and solvothermal (4) methods. NiO nanoparticles were obtained by calcination of the nano-structure complexes at 500 Ā°C. The structures of the
nano-sized compounds were characterized by X-ray powder diffraction and scanning electron microscopy. The thermal stabilities
of the bulk complexes (1ā2) and nano-sized particles (3ā4) were studied by thermogravimetric and differential scanning calorimetry. The catalytic activities of complexes of (1ā4) are reported. The free Schiff base and its Ni(II) complexes have been screened for antibacterial activities against three
Gram-positive bacteria. The metal complexes are more active than the free Schiff base. Electrochemical studies show that the
Ni complexes undergo irreversible reduction in MeCN solution.
Content Type Journal Article
DOI 10.1007/s11243-010-9410-x
Authors
Lotf Ali Saghatforoush, Department of Chemistry, Faculty of Sciences, Payame Noor University (PNU), P.O. Box. 58168-45164, Khoy, Iran
Robabeh Mehdizadeh, Department of Chemistry, Faculty of Sciences, Payame Noor University (PNU), P.O. Box. 58168-45164, Khoy, Iran
Firoozeh Chalabian, Department of Biology, Islamic Azad University, Tehran North Campus, Tehran, Iran
The interaction of thiosemicarbazide with the title complex has been studied spectrophotometrically in aqueous medium as a
function of [complex], [thiosemicarbazide], pH and temperature at constant ionic strength. At pH 7.4, the reaction shows two
distinct paths; both of which are [thiosemicarbazide] dependent. A parallel reaction scheme fits well with the experimental
findings. An associative interchange mechanism is proposed for both the paths; the activation parameters calculated from Eyring
plots are ĪH1ā = 14.2 Ā± 0.8 kJ molā1, ĪS1ā = ā241 Ā± 2 JKā1 molā1, ĪH2ā = 30.8 Ā± 1.4 kJ molā1 and ĪS2ā = ā236 Ā± 4 JKā1 molā1. From the temperature dependence of the outer sphere association complex equilibrium constants, the thermodynamic parameters
calculated are ĪH1Ā° = 34.25 Ā± 1.9 kJ molā1, ĪS1Ā° = 146 Ā± 6 J Kā1 molā1 and ĪH2Ā° = 9.4 Ā± 1.1 kJ molā1, ĪS2Ā° = 71 Ā± 3 JKā1 molā1, which gives a negative ĪGĀ° at all temperatures studied, supporting the spontaneous formation of an outer sphere association
complex.
Content Type Journal Article
DOI 10.1007/s11243-010-9408-4
Authors
Tandra Das(Karfa), Department of Chemistry, University of Burdwan, Burdwan, West Bengal 713104, India
Biplab K. Bera, Department of Chemistry, University of Burdwan, Burdwan, West Bengal 713104, India
Subhasis Mallick, Department of Chemistry, University of Burdwan, Burdwan, West Bengal 713104, India
Parnajyoti Karmakar, Department of Chemistry, University of Burdwan, Burdwan, West Bengal 713104, India
Arup Mandal, Department of Chemistry, University of Burdwan, Burdwan, West Bengal 713104, India
Subala Mondal, Department of Chemistry, University of Burdwan, Burdwan, West Bengal 713104, India
Gauri S. De, Department of Chemistry, University of Burdwan, Burdwan, West Bengal 713104, India
Alak K. Ghosh, Department of Chemistry, University of Burdwan, Burdwan, West Bengal 713104, India
Five ruthenium complexes bearing phenylazo-(2-(phenylthio))phenylmethine ligands of the general type trans-[RuII(bpy)(L)(Cl)2] (C1āC5) {L = YC6H4N=NC(COCH3)=NC6H4(2-SC6H5), H (L1), Cl (L2), OCH3 (L3), Br (L4), or NO2 (L5)} have been synthesized. The crystal structure of trans-[Ru(bpy)(L1)(Cl)2] (C1) is reported and shows no direct metalāS interaction. The complexes have been characterized through spectroscopic (IR, UV/vis
and NMR) and electrochemical (CV) techniques. The electrochemical parameters (EL(L)) of the azoimine ligands are reported.
Graphical Abstract
Five ruthenium complexes bearing phenylazo-(2-(phenylthio))phenylmethine ligands of the general type trans-[RuII(bpy)(L)(Cl)2] {L = YC6H4N=NC(COCH3)=NC6H4(2-SC6H5), Y = H (L1), Cl (L2), OCH3 (L3), Br (L4), and NO2 (L5)} has been synthesized. The crystal structure of the complex trans-[Ru(bpy)(L1)(Cl)2] is reported and show no direct metalāS interactions. This family has been characterized through spectroscopic and electrochemical
techniques. The electrochemical parameters (EL(L)) of these new ligands (L) are reported.
Content Type Journal Article
DOI 10.1007/s11243-010-9407-5
Authors
Mousa Al-Noaimi, Chemistry Department, Faculty of Science, The Hashemite University, Zarqa, Jordan
Mohammad El-khateeb, Chemistry Department, Jordan University of Science and Technology, Irbid, 22110 Jordan
Salim F. Haddad, Chemistry Department, Faculty of Science, University of Jordan, Amman, Jordan
Haytham Saadeh, Chemistry Department, Faculty of Science, University of Jordan, Amman, Jordan
The ester-based vanadium complexes, bis(methylacetoacetato) oxovanadium (IV), bis(ethylacetoacetato) oxovanadium(IV) and bis(ethylbenzoylacetato)
oxovanadium(IV), have been prepared and characterized by physicochemical and spectroscopic methods. The biological efficacies
of the complexes were investigated. These complexes possess substantial glucose lowering ability and also show improved glucose
tolerance effect.
Content Type Journal Article
DOI 10.1007/s11243-010-9405-7
Authors
Angappan Sheela, Materials Division, School of Advanced Sciences, VIT University, Vellore, 632 014 Tamil Nadu India
Rajagopalan Vijayaraghavan, Materials Division, School of Advanced Sciences, VIT University, Vellore, 632 014 Tamil Nadu India
A tridentate nitrogen-sulfur Schiff base, 3-methylbenzyl 2-(6-methylpyridin-2-ylmethylene)hydrazine carbodithioate (6mpyS3M),
was synthesized by condensation of 6-methylpyridine-2-aldehyde with S-3-methylbenzyldithiocarbazate. It crystallized in space
group P 21/n. It displayed intermolecular NāHĀ·Ā·Ā·N hydrogen bonding between the Ī±-nitrogen and the pyridyl nitrogen. The thione sulfur is in a trans position with respect to the 6-methylpyridine fragment across the CāN bond but adopts a cis position with the 3-methylbenzyl fragment through the CāS bond. Octahedral complexes containing two 6mpyS3M ligands were
prepared with Cu(II), Ni(II), Zn(II) and Cd(II). 6mpyS3M and its metal complexes were assayed against selected microbes and
two breast cancer cell lines. 6mpyS3M was strongly active against both cancer cell lines. Its metal complexes showed high
selectivity with Cu(II), Ni(II) and Zn(II) complexes strongly active against only one of the cancer cell lines, whereas the
Cd(II) complex was strongly active only against the other. Only Cu(II) and Cd(II) complexes were active against some of the
bacteria.
Content Type Journal Article
DOI 10.1007/s11243-010-9406-6
Authors
Thahira B. S. A. Ravoof, Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia
Karen A. Crouse, Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia
M. Ibrahim M. Tahir, Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia
Fiona N. F. How, Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia
Rozita Rosli, Department of Obstetrics and Gynaecology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia
David J. Watkins, Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, OX1 3TA Oxford, UK
Tridentate Schiff base ligands L1 and L2, derived from the condensation of 2-hydroxy-3-methoxybenzaldehyde (L) with 2-aminoethanol or 2-aminobutan-1-ol, react with
nickel chloride, azide, or thiocyanate to give rise to two dinuclear complexes of formulas [Ni2(L)(L1)2N3]Ā·H2O (1), [Ni2(L2)3(Ī¼1,1-N3)]Ā·2H2O (2), and one tretranuclear complex [Ni2(L2)2(NCS)]2(C2H5OH)2 (3), where L1 = HOCH2CH(C2H5)NCHC6H3(Oā)(OCH3) and L2 = HO(CH2)2NCHC6H3(Oā)(OCH3). We have characterized these complexes by analytical, crystal structures, and variable temperature magnetic susceptibility
measurements. The magnetic properties of the complexes are studied by magnetic susceptibility (ĻM) vs. temperature measurements. The ĻMT vs. T plots reveal that compounds 1, 2 and 3 are ferromagnetically coupled.
Graphical Abstract
Crystal of two dimers and one tetranuclear nickel (II) complexes were determined. Two dimers are azide/phenolate double bridged,
and the tetranuclear is Ni4O4 cubane complex. And magnetic properties show that these compounds are ferromagnetically coupled.
Content Type Journal Article
DOI 10.1007/s11243-010-9403-9
Authors
Yan Zhang, Beijing Institute of Technology Department of Chemistry & Key Laboratory of Cluster Science of Ministry of Education 100081 Beijing Peopleās Republic of China
Xiao-Man Zhang, Beijing Institute of Technology Department of Chemistry & Key Laboratory of Cluster Science of Ministry of Education 100081 Beijing Peopleās Republic of China
Tian-Fu Liu, Beijing Institute of Technology Department of Chemistry & Key Laboratory of Cluster Science of Ministry of Education 100081 Beijing Peopleās Republic of China
Wen-Guo Xu, Beijing Institute of Technology Department of Chemistry & Key Laboratory of Cluster Science of Ministry of Education 100081 Beijing Peopleās Republic of China
An oxovanadium complex [VO(satsc)(bipy)] (1) (satsc = salicylaldehyde thiosemicarbazone, bipy = 2,2ā²-bipyridine) and its dibromo derivative [VO(3,5-dibrsatsc)(bipy)]
(2) (3,5-dibrsatsc = 3,5-dibromosalicylaldehyde thiosemicarbazone) have been synthesized and characterized by elemental analysis,
IR, ES-MS and 1H NMR. The interaction of these two complexes with calf-thymus DNA (CT-DNA) was studied using UV/Vis, fluorescence spectroscopic
titration, viscosity measurements and thermal denaturation. The results suggest that complexes 1 and 2 interact with CT-DNA by intercalative modes. The DNA-binding affinity of complex 1 is larger than that of complex 2. In addition, their photocleavage reactions with pBR322 supercoiled plasmid DNA were investigated by gel electrophoresis
experiments. Both complexes exhibit significant DNA cleavage activity, and complex 1 showed greater cleaving efficiency than complex 2.
Content Type Journal Article
DOI 10.1007/s11243-010-9404-8
Authors
Yi-fan Du, Guangdong Pharmaceutical University Chemistry Department of the School of Pharmacy Guangzhou 510006 Peopleās Republic of China
Jia-Zheng Lu, Guangdong Pharmaceutical University Chemistry Department of the School of Pharmacy Guangzhou 510006 Peopleās Republic of China
Hai-wei Guo, Guangdong Pharmaceutical University Chemistry Department of the School of Pharmacy Guangzhou 510006 Peopleās Republic of China
Jing Jiang, Guangdong Pharmaceutical University Chemistry Department of the School of Pharmacy Guangzhou 510006 Peopleās Republic of China
Ping Chao, Guangdong Pharmaceutical University Chemistry Department of the School of Pharmacy Guangzhou 510006 Peopleās Republic of China
Fei Chen, Guangdong Pharmaceutical University Chemistry Department of the School of Pharmacy Guangzhou 510006 Peopleās Republic of China
Jie-Ming Pan, Guangdong Pharmaceutical University Chemistry Department of the School of Pharmacy Guangzhou 510006 Peopleās Republic of China
An all-electron scalar relativistic calculation on CunH (n = 1ā13) clusters has been performed by using density functional theory with the generalized gradient approximation at the
PW91 level. Our results reveal that the hydrogen atom prefers to occupy the two fold coordination site for CunH (n = 2, 4ā6, 8, 10ā13) clusters, the single fold coordination site for CunH (n = 1, 3, 7) and the three fold coordination site for Cu9H cluster. For all CunH clusters, only the Cu11 structure in Cu11H is distorted obviously. After adsorption, the CuāCu bond is strengthened and the CuāH bond of odd-numbered CunH clusters is relatively stronger than that of adjacent even-numbered CunH clusters. The CuāCu bond-length and CuāH bond-length for all CunH clusters of our work are significantly shorter than those of previous work. This discrepancy can be explained in terms of
the scalar relativistic effect. The most favorable adsorption between small copper clusters and hydrogen atom takes place
in the case that hydrogen atom is adsorbed onto an odd-numbered pure Cun cluster and becomes CunH cluster with even number of valence electrons. The oddāeven alteration of magnetic moments is observed in CunH clusters and may provide the material with tunable code capacity of ā0ā and ā1ā by adsorbing a hydrogen atom onto odd- or
even-numbered copper clusters.
Content Type Journal Article
DOI 10.1007/s11243-010-9402-x
Authors
Xiang-jun Kuang, Chongqing University College of Mathematics and Physics 400044 Chongqing China
Xin-qiang Wang, Chongqing University College of Mathematics and Physics 400044 Chongqing China
Gao-bin Liu, Chongqing University College of Mathematics and Physics 400044 Chongqing China
Cu(II) polymers of Hbidc (1H-benzimidazole-5,6-dicarboxylate), namely [Cu2(Hbidc)2(H2O)4Ā·3H2O]n (1) and [Cu(Hbidc)]n (2), were synthesized under hydrothermal conditions by variation of the reaction temperature and characterized by physico-chemical,
spectroscopic and single-crystal X-ray diffraction studies. At temperatures from 100 to 170 Ā°C, we only obtained the 2-D structure
compounds 1 and 2, in which the bridging mode of the Hbidc ligand increases from Ī¼3 to Ī¼5 and the number of water ligands decreases to 0. Both compounds have 3-D supramolecular architectures extended by hydrogen
bonding and ĻāĻ interactions between the adjacent layers. Magnetic studies revealed that compound 1 shows weak antiferromagnetic properties and compound 2 exhibits ferromagnetic coupling between the two Cu(II) ions in the dimeric units.
Content Type Journal Article
DOI 10.1007/s11243-010-9400-z
Authors
Kunmiao Wang, Yunnan University Department of Chemistry, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education 650091 Kunming China
Lin Du, Yunnan University Department of Chemistry, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education 650091 Kunming China
Jinmei Han, Yunnan University Department of Chemistry, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education 650091 Kunming China
Zongze Li, Yunnan University Department of Chemistry, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education 650091 Kunming China
Mingjin Xie, Yunnan University Department of Chemistry, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education 650091 Kunming China
Qihua Zhao, Yunnan University Department of Chemistry, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education 650091 Kunming China
The reaction of methyl anthranilate, sodium nitrite, and 2-aminopyridine produces a triazenide, namely, 1-[(2-carboxymethyl)benzene]-3-[2-pyridine]triazene
(HL). In the presence of Et3N, the reaction of HL and CuCl2Ā·2H2O gives a Ī¼4-oxo-bridged tetranuclear copper(II) complex [Cu4OL3Cl3]Ā·1.5THF (1Ā·1.5THF), which has been characterized by X-ray crystallography and magnetic susceptibility measurements.
Content Type Journal Article
DOI 10.1007/s11243-010-9401-y
Authors
Wei Li, South China University of Technology College of Chemistry and Chemical Engineering Guangzhou 510640 China
Xing-Wu Tan, South China University of Technology College of Chemistry and Chemical Engineering Guangzhou 510640 China
Wen-Jun Lei, South China University of Technology College of Chemistry and Chemical Engineering Guangzhou 510640 China
Shu-Zhong Zhan, South China University of Technology College of Chemistry and Chemical Engineering Guangzhou 510640 China
De-Rong Cao, South China University of Technology College of Chemistry and Chemical Engineering Guangzhou 510640 China
Cobalt(II) tri-tert-butoxysilanethiolates with 2,5-dimethylpyridine, 3,4-dimethylpyridine and 3,5- dimethylpyridine co-ligands have been synthesized
by reaction of bimetallic [Co{Ī¼-SSi(OtBu)3}{SSi(OtBu)3}(NH3)]2 with the appropriate pyridines. The complexes were characterized by elemental analysis, single-crystal X-ray structure determination,
IR and UVāVis spectroscopy. These complexes are tetra- or penta-coordinated with CoN2S2 and CoNO2S2 cores, respectively.
Content Type Journal Article
DOI 10.1007/s11243-010-9399-1
Authors
Agnieszka Pladzyk, University of Technology Department of Inorganic Chemistry G. Narutowicz St. 11/12 80-233 GdaÅsk Poland
Joanna Olszewska, University of Technology Department of Inorganic Chemistry G. Narutowicz St. 11/12 80-233 GdaÅsk Poland
Katarzyna Baranowska, University of Technology Department of Inorganic Chemistry G. Narutowicz St. 11/12 80-233 GdaÅsk Poland
Anna Maria DziurzyÅska, University of Technology Department of Inorganic Chemistry G. Narutowicz St. 11/12 80-233 GdaÅsk Poland
We report a facile chemical approach for the synthesis of one-dimensional V2O5/TiO2 coreāshell nanobelts. The coated V2O5 nanobelts are synthesized by a hydrothermal method which is feasible for large-scale production. V2O5 nanobelts coated with a thin layer of TiO2 sol are formed before sintering, and after sintering one-dimensional V2O5/TiO2 coreāshell nanobelts, composed of single-crystalline V2O5 nanobelts cores uniformly coated with anatase TiO2 nanoparticle shells are obtained. The influences of the synthetic parameters, such as sintering temperature and titanium/vanadium
mole ratios, on the morphology of the resulting products are investigated. Interestingly, the shape of single-crystalline
of V2O5 nanobelts is totally preserved after sintering; the morphology can be readily controlled to be smooth or rough by altering
the sintering temperature of the shells and titanium/vanadium mole ratio.
Content Type Journal Article
DOI 10.1007/s11243-010-9397-3
Authors
Shasha Lv, Qingdao University of Science and Technology Key Laboratory of Nanostructured Materials, College of Materials Science and Engineering 266042 Qingdao Peopleās Republic of China
Jie Ding, Qingdao University of Science and Technology Key Laboratory of Nanostructured Materials, College of Materials Science and Engineering 266042 Qingdao Peopleās Republic of China
Hongrui Peng, Qingdao University of Science and Technology Key Laboratory of Nanostructured Materials, College of Materials Science and Engineering 266042 Qingdao Peopleās Republic of China
Guicun Li, Qingdao University of Science and Technology Key Laboratory of Nanostructured Materials, College of Materials Science and Engineering 266042 Qingdao Peopleās Republic of China
Treatment of 3-pyridylphosphonic acid with Cu(OAc)2Ā·H2O under hydrothermal conditions afforded the complex [Cu(Ī·4,Ī¼4:3-C5H4NPO3)] (1), whereas the analogous reaction with Co(OAc)2Ā·4H2O gave [Co(3-C5H4NPO3)(H2O)5] (2) in good yield. Compounds 1 and 2 have been characterized by IR, elemental analyses and X-ray crystallography. Compound 1 shows a two-dimensional layer structure, in which each Cu center bridges to another Cu center via two pyridylphosphonato
oxygen atoms of bridging ligands to form a one-dimensional ladder of {CuO3N}{CPO3} units. The pyridyl N atom further coordinates to the Cu center in the neighboring chain, thus forming a two-dimensional
layer. Compound 2 contains molecules of [Co(3-C5H4NPO3)(H2O)5] which link each other via hydrogen bonds to form a three-dimensional super-molecular framework. Complex 1 shows weak antiferromagnetic interactions between the closest copper centers.
Content Type Journal Article
DOI 10.1007/s11243-010-9395-5
Authors
Jian-Liang Zhou, Central South University School of Chemistry and Chemical Engineering 410083 Changsha Peopleās Republic of China
Xue-Qin He, Central South University School of Chemistry and Chemical Engineering 410083 Changsha Peopleās Republic of China
Bin Liu, Northwest University Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry, Shaanxi Key Laboratory of Physico-Inorganic Chemistry 710069 Xiāan Peopleās Republic of China
Yan Huo, Central South University School of Chemistry and Chemical Engineering 410083 Changsha Peopleās Republic of China
Shou-Chun Zhang, Central South University School of Chemistry and Chemical Engineering 410083 Changsha Peopleās Republic of China
Xiao-Gai Chun, Central South University School of Chemistry and Chemical Engineering 410083 Changsha Peopleās Republic of China
Three complexes of a dithiocarbamate ligand (dbpdtc = benzyl(4-(benzylamino)phenyl)dithiocarbamate), namely [Ni(dbpdtc)2] (1), [Ni(dbpdtc)(NCS)(PPh3)] (2) and [Ni(dbpdtc)(PPh3)2]ClO4 (3) have been prepared. The complexes were characterized by IR, electronic spectroscopy and cyclic voltammetry. A single-crystal
X-ray structural analysis was carried out for complex 1 and showed that the nickel is in a distorted square planar environment with a NiS4 chromophore. For the two mixed ligand complexes, the thioureide Ī½CāN values were shifted to higher wavenumbers compared to [Ni(dbpdtc)2], suggesting increased strength of the thioureide bond due to the presence of the Ļ-accepting phosphine. Electronic spectral studies suggest square planar geometries for the complexes. Cyclic voltammetry showed
easier reduction of nickel(II) to nickel(I) in the mixed ligand complexes compared to [Ni(dbpdtc)2].
Content Type Journal Article
DOI 10.1007/s11243-010-9398-2
Authors
Narayanaswamy Srinivasan, Annamalai University Department of Chemistry Annamalainagar Chidambaram 608 002 India
Panneerselvam Valarmathi, Annamalai University Department of Chemistry Annamalainagar Chidambaram 608 002 India
Subbiah Thirumaran, Annamalai University Department of Chemistry Annamalainagar Chidambaram 608 002 India
Samuele Ciattini, Polo Scientifio di Sesto Fiorentino Centro di Cristallografia Strutturale Via della Lastruccia No. 3 50019 Sesto Fiorentino, Firenze Italy
The complexes [(C6H6)RuCl2(Hmtp)] and [(C6H6)RuCl2(C4H4N2)] have been prepared and studied by IR, 1H NMR, UVāVIS spectroscopy and X-ray crystallography. The complexes were prepared by reactions of [(C6H6)RuCl2]2 with 7-hydroxy-5-methyl[1,2,4]triazolo[1,5-a]pyrimidine (Hmtp) and pyrimidine, respectively, in methanol. The electronic structures and UVāVis spectra of the complexes
have been calculated using the TDāDFT method.
Content Type Journal Article
DOI 10.1007/s11243-010-9396-4
Authors
J. G. MaÅecki, Institute of Chemistry, University of Silesia Department of Crystallography 9th Szkolna St. 40-006 Katowice Poland
Two CoII complexes, namely {[CoL(MeOH)(Ī¼-OAc)]2Co}Ā·2MeCNĀ·2MeOH (1) and {[CoL(EtOH)(Ī¼-OAc)]2Co}Ā·3EtOH (2) (H2L=3,3ā²-dimethoxy-2,2ā²-[(1,3-propylene)dioxybis(nitrilomethylidyne)]diphenol), have been synthesized and characterized by X-ray
crystallography. Both complexes contain octahedral coordination geometries, comprising three CoII atoms, two deprotonated bisoxime L2ā units in which four Ī¼-phenoxo oxygen atoms form two [CoL(X)] (X = MeOH or EtOH) units, two acetate ligands coordinated to
three CoII centers through CoāOāCāOāCo bridges, and coordinated and non-coordinated solvent. Both complexes exhibit 2D supramolecular
networks through different intermolecular hydrogen-bonding interactions.
Content Type Journal Article
DOI 10.1007/s11243-010-9394-6
Authors
Wen-Kui Dong, Lanzhou Jiaotong University School of Chemical and Biological Engineering 730070 Lanzhou Gansu China
Li Li, Lanzhou Jiaotong University School of Chemical and Biological Engineering 730070 Lanzhou Gansu China
Yin-Xia Sun, Lanzhou Jiaotong University School of Chemical and Biological Engineering 730070 Lanzhou Gansu China
Jun-Feng Tong, Lanzhou Jiaotong University School of Chemical and Biological Engineering 730070 Lanzhou Gansu China
Jian-Chao Wu, Lanzhou Jiaotong University School of Chemical and Biological Engineering 730070 Lanzhou Gansu China
Two new Mn(II) coordination polymers formed with molecular formula [Mn(H2O)2(HBTC)Ā·(H2O)] 1 and [Mn(H2O)2(4,4ā²bipy)(HBTC)2]Ā·(H4,4ā²bipy)22, where BTC = 1,2,4-benzenetricarboxylate and 4,4ā²bipy = 4,4ā²bipydine, have been synthesized via hydrothermal approach and
characterized by single crystal X-ray diffraction techniques. 1 is composed of MnāH2OāMn 1D chains and further the chains are linked by HBTC ligands to form a 2D network in the ab plane; 2 is constructed by Mnā4,4ā²bipyāMn 1D chains along the b direction with Mn2+ ions coordinated to H2BTC and water as terminal ligands to form a 2D network. We also prepared a third compound with the molecular formula of [Mn(H2O)(HBTC)Ā·(H2O)] which has been recently structurally reported elsewhere. The magnetic properties of the three compounds have been studied
in detail under variable temperatures.
Content Type Journal Article
DOI 10.1007/s11243-010-9393-7
Authors
Fa-Nian Shi, University of Aveiro Department of Chemistry, CICECO 3810-193 Aveiro Portugal
MĆ”rio S. Reis, Universidade Federal Fluminense Instituto de FĆsica Niteroi RJ 24210-346 Brazil
Paula BrandĆ£o, University of Aveiro Department of Chemistry, CICECO 3810-193 Aveiro Portugal
A. M. Souza, Centro Brasileiro De Pesquisas FĆsicas, Rua Dr. Xavier Sigaud 150 Urca Rio de Janeiro RJ 22290-180 Brazil
Two coordination complexes, namely [Co(phen)(H2O)L]Ā·H2O and [Ni2(phen)2(H2O)2L2]Ā·4H2O (phen = 1,10-phenanthroline, H2L = 1,3-adamantanedicarboxylic acid) have been hydrothermally synthesized and structurally characterized by single crystal
X-ray diffraction. [Co(phen)(H2O)L]Ā·H2O consists of 1D chains of the complex plus lattice H2O molecules. Interchain hydrogen bonds and ĻāĻ stacking interactions assemble the 1D chains into 2D layers. [Ni2(phen)2(H2O)2L2]Ā·4H2O is a binuclear complex which is assembled into a 3D supramolecular structure by strong hydrogen bonds and ĻāĻ stacking interactions.
Both complexes were characterized by physico-chemical and spectroscopic methods.
Content Type Journal Article
DOI 10.1007/s11243-010-9392-8
Authors
Hong-Zhen Xie, Ningbo University Faculty of Materials Science and Chemical Engineering, State Key Laboratory Base of Novel Functional Materials and Preparation Science Ningbo Zhejiang 315211 Peopleās Republic of China
Shi-Jie Huang, Ningbo University Faculty of Materials Science and Chemical Engineering, State Key Laboratory Base of Novel Functional Materials and Preparation Science Ningbo Zhejiang 315211 Peopleās Republic of China
Jin Zhou, Ningbo University Faculty of Materials Science and Chemical Engineering, State Key Laboratory Base of Novel Functional Materials and Preparation Science Ningbo Zhejiang 315211 Peopleās Republic of China
Shu-Ping Yu, Ningbo University Faculty of Materials Science and Chemical Engineering, State Key Laboratory Base of Novel Functional Materials and Preparation Science Ningbo Zhejiang 315211 Peopleās Republic of China
Dan-Yi Wei, Ningbo University Faculty of Materials Science and Chemical Engineering, State Key Laboratory Base of Novel Functional Materials and Preparation Science Ningbo Zhejiang 315211 Peopleās Republic of China
