Chemie der Uebergngsmetalle - Aktuelle Forschungsartikel renommierter Fachzeitschriften
Aktuelle Fachartikel zur Chemie der bergangelemente der Periodensystems, sortiert nach Erscheinungsdatum.
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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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Abstract Tetrakis(selenodiazole)porphyrazine and its vanadyl (VO2+) complex have been prepared and characterized by FT-IR, UV–vis, and MALDI-MS. The magnetic properties of the complex have
been investigated by EPR spectroscopy.
Content Type Journal Article
DOI 10.1007/s11243-008-9172-x
Authors
Hilal Onay, Fatih University Department of Chemistry Istanbul Turkey
Yusuf Yerli, Gebze Institute of Technology Department of Physics Gebze-Kocaeli Turkey
Ramazan Öztürk, Fatih University Department of Chemistry Istanbul Turkey
Abstract Tricyclohexylphosphine-cyclopalladated ferrocenylimine complexes were found to be very efficient catalysts for the one-pot
borylation/Suzuki cross-coupling reactions of aryl chlorides with bis(pinacolato)diboron. Typically, using 0.5–1.0 mol% of
catalyst in the presence of 3.0 equivalents of K2CO3 as base in dioxane at 100 °C provided the corresponding symmetrical biaryls in good to excellent yields.
Content Type Journal Article
DOI 10.1007/s11243-008-9174-8
Authors
Chen Xu, Zhengzhou University Department of Chemistry, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities Zhengzhou 450052 People’s Republic of China
Jun-Fang Gong, Zhengzhou University Department of Chemistry, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities Zhengzhou 450052 People’s Republic of China
Mao-Ping Song, Zhengzhou University Department of Chemistry, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities Zhengzhou 450052 People’s Republic of China
Yang-Jie Wu, Zhengzhou University Department of Chemistry, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities Zhengzhou 450052 People’s Republic of China
Abstract Azo compounds were prepared by coupling of benzenediazonium chloride ions with 1-amino-2-hydroxy-4-naphthalene sulfonic acid
under alkaline conditions, and Schiff bases, L1–3 were then obtained by the condensation of 1-amino-2-hydroxy-3-(phenylazo)-4-naphthalene sulfonic acid, 1-amino-2-hydroxy-3-(4-ethylphenylazo)-4-naphthalene sulfonic acid, and 1-amino-2-hydroxy-3-(4-nitrophenylazo)-4-naphthalene sulfonic acid with salicylaldehyde. New copper(II), nickel(II), and zinc(II) complexes of the
Schiff base ligands were also prepared and characterized by spectroscopic methods, magnetic measurements, elemental, and thermogravimetric
analysis.
Content Type Journal Article
DOI 10.1007/s11243-008-9173-9
Authors
Emin Erdem, Pamukkale University Department of Chemistry Kinikli Campus 20017 Denizli Turkey
Eylem Yildirim Sari, Pamukkale University Department of Chemistry Kinikli Campus 20017 Denizli Turkey
Rafet Kilinçarslan, Pamukkale University Department of Chemistry Kinikli Campus 20017 Denizli Turkey
Nilgün Kabay, Pamukkale University Department of Chemistry Kinikli Campus 20017 Denizli Turkey
Abstract Some furanyl-derived sulfonamides and their cobalt(II), copper(II), nickel(II), and zinc(II) complexes have been synthesized.
The structural formulae of the complexes have been inferred by using physico-chemical and spectroscopic methods. The new sulfonamides
behave as bidentate ligands in complexation with the metals and an octahedral geometry has been suggested for all these complexes.
Both the free sulfonamides and their complexes have been screened for their in vitro antibacterial and antifungal activities
against a number of bacteria and fungi. In vitro cytotoxic properties of all the compounds were also studied using brine shrimp
bioassay.
Content Type Journal Article
DOI 10.1007/s11243-008-9171-y
Authors
Zahid H. Chohan, Bahauddin Zakariya University Department of Chemistry Multan 60800 Pakistan
Abstract An EPR method involving measurement of half-field transitions was applied to determine the intermolecular Cu–Cu distances
in copper(II)-carboxylate complexes with biologically important ligands. The experimental powder EPR spectra are composed
of allowed (ΔMS = ±1) transitions centered at ~3,200 Gauss and of weak intensity, nominally forbidden, half-field (ΔMS = ±2) peaks observable at ~1,600 Gauss. Values of the average interspin distance for each complex were determined from the
ratios of integrated allowed and forbidden peak areas using each of several methods. The calculated interspin distances were
correlated with the copper–copper distances experimentally obtained by X-ray crystallography. The distances determined from
the EPR spectra agree well with the X-ray determined values when the crystallographic value for one member of a series is
used to calibrate the series. Less satisfactory agreement is found when methods based on Cu-spin-label systems are used.
Content Type Journal Article
DOI 10.1007/s11243-008-9168-6
Authors
J. Svorec, Slovak Technical University Faculty of Chemical and Food Technology Radlinského 9 812 37 Bratislava Slovakia
M. Valko, Slovak Technical University Faculty of Chemical and Food Technology Radlinského 9 812 37 Bratislava Slovakia
J. Moncol, Slovak Technical University Faculty of Chemical and Food Technology Radlinského 9 812 37 Bratislava Slovakia
M. Mazúr, Slovak Technical University Faculty of Chemical and Food Technology Radlinského 9 812 37 Bratislava Slovakia
M. Melník, Slovak Technical University Faculty of Chemical and Food Technology Radlinského 9 812 37 Bratislava Slovakia
J. Telser, Roosevelt University Department of Biological, Chemical and Physical Sciences Chicago IL 60605 USA
Abstract Irradiation (λ > 320 nm) of ferrocene in chloroform causes decomposition of chloroform and the accumulation of HCl, CCl3OOH, and C2Cl6. This appears to occur initially through a cycle in which (a) ferrocene is oxidized to ferrocenium and tetrachloroferrate
ions, (b) FeCl4− undergoes photodissociation, and (c) ferrocenium reoxidizes the chloroferrate(II) species. On extended photolysis, the concentrations
of CCl3OOH and FeCl4− build up and a competing cycle in which FeCl4− is restored through oxidation of the chloroferrate(II) species by CCl3OOH accelerates the decomposition rate.
Content Type Journal Article
DOI 10.1007/s11243-008-9169-5
Authors
Laura A. Peña, Santa Clara University Department of Chemistry Santa Clara CA 95053 USA
Anton J. Seidl, Santa Clara University Department of Chemistry Santa Clara CA 95053 USA
Larissa R. Cohen, Santa Clara University Department of Chemistry Santa Clara CA 95053 USA
Patrick E. Hoggard, Santa Clara University Department of Chemistry Santa Clara CA 95053 USA
Abstract Two mononuclear complexes with the Schiff base ligand 2-((2-(dimethylamino)ethylimino)methyl)phenol (HL), namely ZnL2 and CoL2(N3), have been synthesized and characterized using single-crystal X-ray diffraction and spectroscopy (IR, 1H NMR, UV–Vis, MS and EA). Both complexes are mononuclear. The coordination geometry in the Zn(II) complex is distorted square-pyramidal
with a weak Zn···N interaction. The Co(III) complex is distorted octahedral, and the neutral molecule unit [CoIIIL2(N3)] is connected by C–H···N hydrogen bonds to form a one-dimensional infinite chain. The luminescence of the zinc compound
has been investigated.
Content Type Journal Article
DOI 10.1007/s11243-008-9166-8
Authors
Sheng-Feng Hong, South China Normal University Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment Guangzhou 510006 People’s Republic of China
Xiao-Huan Liang, South China Normal University Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment Guangzhou 510006 People’s Republic of China
Hua-Cai Fang, South China Normal University Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment Guangzhou 510006 People’s Republic of China
Xu-Lin Zhan, South China Normal University Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment Guangzhou 510006 People’s Republic of China
Zheng-Yuan Zhou, South China Normal University Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment Guangzhou 510006 People’s Republic of China
Li Chen, South China Normal University Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment Guangzhou 510006 People’s Republic of China
Yue-Peng Cai, South China Normal University Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment Guangzhou 510006 People’s Republic of China
Abstract The reaction of [(η5-R2PC5H4)2Co][PF6] with (Me2S)AuCl (1:2) resulted in {[(η5-R2PC5H4)2Co](AuCl)2}[PF6] (R = Ph, Cy, or iPr). With a 1:1 ratio of [(η5-R2PC5H4)Co(η5-C5H5)][PF6] to (Me2S)AuCl, yellow crystalline {[(η5-R2PC5H4)Co(η5-C5H5)](AuCl)}[PF6] was produced. The reaction of {[(η5-Cy2PC5H4)Co(η5-C5H5)](AuCl)}[PF6] with phenyl acetylene gave {[(η5-Cy2PC5H4)Co(η5-C5H5)][Au(C≡C–Ph)]}[PF6], while the reaction of {[(η5-Cy2PC5H4)2Co](AuCl)2}[PF6] with phenyl acetylene produced the unusual ionic complex {[(η5-Cy2PC5H4)2Co][Au(C≡C–Ph)]2}[Au(C≡C–Ph)2]. The structure of this complex has been characterized by X-ray crystallography, and a possible pathway for its formation
is suggested.
Content Type Journal Article
DOI 10.1007/s11243-008-9164-x
Authors
Yan Chen, Central China Normal University Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry Wuhan 430079 People’s Republic of China
Xiang-Hua Wu, Central China Normal University Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry Wuhan 430079 People’s Republic of China
Guang-Ao Yu, Central China Normal University Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry Wuhan 430079 People’s Republic of China
Shan Jin, Central China Normal University Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry Wuhan 430079 People’s Republic of China
Xiang-Gao Meng, Central China Normal University Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry Wuhan 430079 People’s Republic of China
Sheng-Hua Liu, Central China Normal University Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry Wuhan 430079 People’s Republic of China
Abstract The kinetics of the oxidation of 2-methyl cyclohexanone and cycloheptanone with Fe(CN)63− catalyzed by RhCl3 in alkaline medium was investigated at four temperatures. The rate follows direct proportionality with respect to lower concentrations
of hexacyanoferrate(III) ion, but tends to become zero order at higher concentrations of the oxidant, while the reaction shows
first-order kinetics with respect to hydroxide ion and cyclic ketone concentrations. The rate shows a peculiar nature with
respect to RhCl3 concentrations in that it increases with increase in catalyst at low catalyst concentrations but after reaching a maximum,
further increase in concentration retards the rate. An increase in the ionic strength of the medium increases the rate, while
increase in the Fe(CN)64− concentration decreases the rate.
Content Type Journal Article
DOI 10.1007/s11243-008-9167-7
Authors
Praveen K. Tandon, University of Allahabad Department of Chemistry Allahabad 211002 India
Mamta Dhusia, University of Allahabad Department of Chemistry Allahabad 211002 India
Abstract The Schiff base N-crotonyl-2-hydroxyphenylazomethine HL, derived from the reaction of acrylamide and salicylaldehyde, was synthesised. Polymeric
complexes were obtained from the reaction of polymeric HL with divalent metals. The mode of bonding and overall geometry of
the complexes were determined through physico-chemical and spectroscopic methods and compared with that previously reported
for the analogous monomeric ligand. These studies revealed tetrahedral geometries around the metal centres for Mn(II), Co(II),
Zn(II), Cd(II) and Hg(II) complexes of general formula [M(L)Cl], octahedral for Ni(II) and Cu(II) complexes of general formula
[M′(L)Cl(H2O)2], and square planar for Pd(II) complex of general formula [Pd(L)Cl].
Content Type Journal Article
DOI 10.1007/s11243-008-9165-9
Authors
Mohamad Jaber Al-Jeboori, University of Baghdad Department of Chemistry, College of Education, Ibn Al-Haitham P.O. Box 4150 Adhamiyah, Baghdad Iraq
Amar H. Al-Dujaili, University of Baghdad Department of Chemistry, College of Education, Ibn Al-Haitham P.O. Box 4150 Adhamiyah, Baghdad Iraq
Alyaa E. Al-Janabi, University of Baghdad Department of Chemistry, College of Education, Ibn Al-Haitham P.O. Box 4150 Adhamiyah, Baghdad Iraq
Abstract Condensation between 4′-aminobenzo-15-crown-5- and 4-antipyrinecarboxaldehyde yielded the functionalized crown ether (L = 1,5-dimethyl-4-[(2,3,5,6,8,9,11,12-octahydro-1,4,7,10,13-benzopentaoxacyclopentadecin-15-ylimino)methyl]-2-phenyl-1,2-dihydro-3H-pyrazol-3-one). A 1:1 (Na+:L) complex has been prepared. The reaction of Fe(II) and Cu(II) salts with L gave complexes of composition [Fe(L)Cl2] and [Cu(L)2Cl2]. Heteronuclear complexes [Fe(L)Cl2Na]ClO4 and [Cu(L)2Cl2Na]ClO4 have also been synthesized from the reactions of [Fe(L)Cl2] and [Cu(L)2Cl2] with NaClO4. The compounds have been characterized by microanalyses and spectroscopic methods.
Content Type Journal Article
DOI 10.1007/s11243-008-9163-y
Authors
Zeliha Hayvali, University of Ankara Department of Chemistry, Faculty of Science 06100 Tandogan, Ankara Turkey
Abstract Oxidation of 3-(4-methoxyphenoxy)-1,2-propanediol (MPPD) by bis(hydrogenperiodato) argentate(III) complex anion, [Ag(HIO6)2]5− has been studied in aqueous alkaline medium by use of conventional spectrophotometry. The major oxidation product of MPPD
has been identified as 3-(4-methoxyphenoxy)-2-ketone-1-propanol by mass spectrometry. The reaction shows overall second-order
kinetics, being first-order in both [Ag(III)] and [MPPD]. The effects of [OH−] and periodate concentration on the observed second-order rate constants k′ have been analyzed, and accordingly an empirical expression has been deduced:
where [IO4−]tot denotes the total concentration of periodate and ka = (0.19 ± 0.04) M−1 s−1, kb = (10.5 ± 0.3) M−2 s−1, and K1 = (5.0 ± 0.8) × 10−4 M at 25.0 °C and ionic strength of 0.30 M. Activation parameters associated with ka and kb have been calculated. A mechanism is proposed, involving two pre-equilibria, leading to formation of a periodato–Ag(III)–MPPD
complex. In the subsequent rate-determining steps, this complex undergoes inner-sphere electron-transfer from the coordinated
MPPD molecule to the metal center by two paths: one path is independent of OH−, while the other is facilitated by a hydroxide ion.
Content Type Journal Article
DOI 10.1007/s11243-008-9162-z
Authors
Hongmei Shi, Hebei Medical University School of Public Health Shijiazhuang 050017 Hebei Province People’s Republic of China
Weijun Kang, Hebei Medical University School of Public Health Shijiazhuang 050017 Hebei Province People’s Republic of China
Shigang Shen, Hebei University College of Chemistry and Environmental Science Baoding 071002 Hebei Province People’s Republic of China
Hanwen Sun, Hebei University College of Chemistry and Environmental Science Baoding 071002 Hebei Province People’s Republic of China
Abstract Chromium(III)-lutidinato complexes of general formula [Cr(lutH)n(H2O)6−2n]3−n (where lutH− is N,O-bonded lutidinic acid anion) were obtained and characterized in solution. Acid-catalysed aquation of [Cr(lutH)3]0 leads to only one ligand dissociation, whereas base hydrolysis produces chromates(III) as a result of subsequent ligand liberation
steps. The kinetics of the first ligand dissociation were studied spectrophotometrically, within the 0.1–1.0 M HClO4 and 0.4–1.0 M NaOH range. In acidic media, two reaction stages, the chelate-ring opening and the ligand dissociation, were
characterized. The dependencies of pseudo-first-order rate constants on [H+] are as follows: kobs1 = k1 + k−1/K1[H+] and kobs2 = k2K2[H+]/(1 + K2[H+]), where k1 and k2 are the rate constants for the chelate-ring opening and the ligand dissociation, respectively, k−1 is the rate constant for the chelate-ring closure, and K1 and K2 are the protonation constants of the pyridine nitrogen atom and coordinated 2-carboxylate group in the one-end bonded intermediate,
respectively. In alkaline media, the rate constant for the first ligand dissociation depends on [OH−]: kobs1 = kOH(1) + kO[OH−], where kOH(1) and kO are rate constants of the first ligand liberation from the hydroxo- and oxo-forms of the intermediate, respectively, and
K2 is an equilibrium constant between these two protolytic forms. Kinetic parameters were determined and a mechanism for the
first ligand dissociation is proposed. The kinetics of the ligand liberation from [Cr(lut)(OH)4]3− were also studied and the values of the pseudo-first-order rate constants are [OH−] independent.
Content Type Journal Article
DOI 10.1007/s11243-008-9160-1
Authors
Ewa Kita, Nicolaus Copernicus University Department of Chemistry 87-100 Toruń Poland
Hasan Marai, Nicolaus Copernicus University Department of Chemistry 87-100 Toruń Poland
Łukasz Iglewski, Nicolaus Copernicus University Department of Chemistry 87-100 Toruń Poland
Abstract Two complexes [CuII(pbt)(dmf)Cl2] and [FeIII(pbt)Cl3], where pbt is 2-(2-pyridyl)benzothiazole, and dmf is dimethylformamide, were prepared by the reaction of metal chlorides
with pbt solutions. The structures of the products were identified by elemental analysis, usual spectroscopic methods and
X-ray diffraction analysis. The crystal data revealed penta-coordination around both metal ions, with trigonal bipyramidal
geometries. 2-(2-pyridyl)benzothiazole binds to both CuII and FeIII in the N,N-chelation manner and leaves the S atom uncoordinated.
Content Type Journal Article
DOI 10.1007/s11243-008-9161-0
Authors
Katayoun Marjani, Tarbiat Moalem University Faculty of Chemistry 49 Dr. Mofateh Ave. Tehran 15614 Iran
Mohsen Mousavi, Islamic Azad University Department of Chemistry Saveh Branch Saveh Iran
David L. Hughes, University of East Anglia School of Chemical Sciences and Pharmacy Norwich NR4 7TJ UK
Abstract The synthesis and characterization of six new 2-methylthionicotinate (2-MeSnic) copper(II) monomeric complexes [Cu(2-MeSnic)2L2] (L is furo[3,2-c]pyridine—fpy, 2-methylfuro[3,2-c]pyridine—Mefpy, 2,3-dimethylfuro[3,2-c]pyridine—Me2fpy or benzo[4,5]furo[3,2-c]pyridine—Bfp), [Cu(2-MeSnic)2(fpy)2(H2O)], as well as [Cu(2-MeSnic)2(CF3Phfpy)2(H2O)2] (CF3Phfpy is 2-(3-trifluoromethylphenyl)furo[3,2-c]pyridine) are reported. The characterizations were based on elemental analysis,
infrared, electronic and EPR spectra. The crystal structure of one of the complexes has been determined. The CuII atoms of [Cu(2-MeSnic)2(fpy)2(H2O)] are six-coordinated in a highly distorted tetragonal–bipyramidal arrangement by two nitrogen atoms, one from each fpy,
in trans-positions, by three oxygen atoms of the carboxyl groups of 2-MeSnic ligands (one monodentate, one asymmetrically bidentate),
one axial position being occupied by the oxygen of a water molecule. The antimicrobial effects have been tested on various
strains of bacteria, yeasts and filamentous fungi. A comparison of the IC50 and MIC values has shown a decrease of inhibition activities of tested compounds in the order: [Cu(2-MeSnic)2(Bfp)2] > Bfp > [Cu(2-MeSnic)2(CF3Phfpy)2(H2O)2] > [Cu(2-MeSnic)2(Me2fpy)2] > CF3Phfpy > [Cu(2-MeSnic)2(Mefpy)2] > Me2fpy > [Cu(2-MeSnic)2(fpy)2(H2O)] > [Cu(2-MeSnic)2(H2O)]2 > Mefpy > fpy = 2-MeSnicH = CuSO4.
Content Type Journal Article
DOI 10.1007/s11243-008-9151-2
Authors
Peter Segl’a, Slovak Technical University Department of Inorganic Chemistry Radlinského 9 812 37 Bratislava Slovakia
Jozef Miklovič, University of St. Cyril and Methodius Department of Inorganic Chemistry, Faculty of Natural Sciences 917 01 Trnava Slovakia
Dušan Mikloš, Slovak Technical University Department of Inorganic Chemistry Radlinského 9 812 37 Bratislava Slovakia
Viera Mrázová, University of St. Cyril and Methodius Department of Inorganic Chemistry, Faculty of Natural Sciences 917 01 Trnava Slovakia
Lenka Krupková, Slovak Technical University Department of Biochemistry and Microbiology Radlinského 9 812 37 Bratislava Slovakia
Daniela Hudecová, Slovak Technical University Department of Biochemistry and Microbiology Radlinského 9 812 37 Bratislava Slovakia
Zuzana Ondrušová, Slovak Technical University Department of Biochemistry and Microbiology Radlinského 9 812 37 Bratislava Slovakia
Jozef Švorec, Slovak Technical University Department of Inorganic Chemistry Radlinského 9 812 37 Bratislava Slovakia
Ján Moncol, Slovak Technical University Department of Inorganic Chemistry Radlinského 9 812 37 Bratislava Slovakia
Milan Melník, Slovak Technical University Department of Inorganic Chemistry Radlinského 9 812 37 Bratislava Slovakia
Abstract Diacetylplatinum(II) complexes [Pt(COMe)2(N^N)] (N^N = bpy, 3a; 4,4′-t-Bu2-bpy, 3b) were found to undergo oxidative addition reactions with organyl halides. The reaction of 3a with methyl iodide and propargyl bromide led to the formation of the cis addition products (OC-6-34)-[Pt(COMe)2(R)X(bpy)] (R = Me, X = I, 4a; CH2C≡CH, X = Br, 4k). Analogous reactions of 3a with ethyl iodide, benzyl bromide, and substituted benzyl bromides, 3-(bromomethyl)pyridine, 2-(bromomethyl)thiophene, allyl
bromide, and cyclohex-2-enyl bromide led to exclusive formation of the trans addition products (OC-6-43)-[Pt(COMe)2(R)X(bpy)] (X = I, R = Et, 4b; X = Br, R = CH2C6H5, 4c; CH2C6H4(o-Br), 4d; CH2C6H4(p-COOH), 4e; CH2-3-py (3-pyridylmethyl), 4f; CH2-2-tp (2-thiophenylmethyl), 4g; CH2CH=CH2, 4h; c-hex-2-enyl (cyclohex-2-enyl), 4i). All complexes 4 were characterized by microanalysis, 1H and 13C NMR and IR spectroscopy. Additionally, complexes 4a, 4f, and 4g were characterized by single-crystal X-ray diffraction analyses. Reactions of 3a and 3b with o-, m- and p-bis(bromomethyl)benzene, respectively, led to the formation of dinuclear platinum(IV) complexes [{Pt(COMe)2Br(N^N)}2-{μ-(CH2)2C6H4}] (5). These complexes were characterized by microanalysis, IR spectroscopy, and depending on their solubility by 1H and 13C NMR spectroscopy, too. A single-crystal X-ray diffraction analysis of complex [{Pt(COMe)2Br(bpy)}2{μ-m-(CH2)2C6H4}] (5b) confirmed its dinuclear composition. The solid-state structures of 4a, 4f, 4g, and 5b are discussed in terms of C–H···O and O–H···O hydrogen bonds as well as π–π stacking between aromatic rings.
Content Type Journal Article
DOI 10.1007/s11243-008-9159-7
Authors
Michael Werner, Martin-Luther-Universität Halle-Wittenberg Institut für Chemie – Anorganische Chemie Kurt-Mothes-Str. 2 06120 Halle Germany
Clemens Bruhn, Martin-Luther-Universität Halle-Wittenberg Institut für Chemie – Anorganische Chemie Kurt-Mothes-Str. 2 06120 Halle Germany
Abstract Reaction of the potassium salts of N-(thio)phosphorylated thioureas of common formula AdNHC(S)N(H)P(X)(OiPr)2 (Ad = adamantyl; X = O, HLI; X = S, HLII) with Co(II), Zn(II), and Cd(II) cations in aqueous EtOH leads to M(LI,II-X, S)2 chelate complexes. The Cd(II) complex Cd(LI)2 could not be isolated under analogous conditions because of its hydrolytic lability. The structure of the resulting compounds
was studied by means of spectroscopy and microanalysis; in addition, the molecular structure of the complex Co(LII)2 was elucidated by single crystal X-ray diffraction analysis. The cobalt atom is in a tetrahedral S4 environment formed by the C=S and P=S sulfur atoms of two deprotonated ligands LII. The magnetic properties of Co(LI,II)2 were investigated and the photoluminescent properties of the complexes are also reported.
Content Type Journal Article
DOI 10.1007/s11243-008-9157-9
Authors
Damir A. Safin, Kazan State University A. M. Butlerov Chemistry Institute Kremlevskaya St. 18 420008 Kazan Russian Federation
Michael Bolte, Institut für Anorganische Chemie, J.-W.-Goethe-Universität Frankfurt/Main Germany
Maria G. Babashkina, Kazan State University A. M. Butlerov Chemistry Institute Kremlevskaya St. 18 420008 Kazan Russian Federation
Abstract A series of trinuclear Cu(II) complexes have been prepared by Schiff base condensation of 1,8-[bis(3-formyl-2-hydroxy-5-methyl)benzyl]-l,4,8,11-tetraazacyclotetradecane
and 1,8-[bis(3-formyl-2-hydroxy-5-bromo)benzyl]-l,4,8,11-tetraazacyclotetradecane with aromatic and aliphatic diamines, Cu(II)
perchlorate and triethylamine. The complexes were characterized by elemental and spectroscopic analysis. Electrochemical studies
of the complexes in DMF solution show three irreversible one-electron reduction processes around Epc1 = −0.73 to −0.98 V, Epc2 = −0.91 to −1.20 V and Epc3 = −1.21 to −1.33 V. ESR spectra and magnetic moments of the trinuclear Cu(II) complexes show the presence of antiferromagnetic
coupling. The rate constants for hydrolysis of 4-nitrophenylphosphate by the Cu(II) complexes are in the range of 3.33 × 10−2 to 7.58 × 10−2 min−1. The rate constants for the catecholase activity of the complexes fall in the range of 2.67 × 10−2 to 7.56 × 10−2 min−1. All the complexes were screened for antifungal and antibacterial activity.
Content Type Journal Article
DOI 10.1007/s11243-008-9155-y
Authors
Shanmugam Sreedaran, University of Madras Department of Inorganic Chemistry, School of Chemical Sciences Guindy Campus Chennai 600 025 India
Kuppannan Shanmuga Bharathi, University of Madras Department of Inorganic Chemistry, School of Chemical Sciences Guindy Campus Chennai 600 025 India
Aziz Kalilur Rahiman, University of Madras Department of Inorganic Chemistry, School of Chemical Sciences Guindy Campus Chennai 600 025 India
Raju Prabu, University of Madras Department of Inorganic Chemistry, School of Chemical Sciences Guindy Campus Chennai 600 025 India
Raman Jagadesh, University of Madras Centre for Advanced Studies in Botany Guindy Campus Chennai 600 025 India
Nanjian Raaman, University of Madras Centre for Advanced Studies in Botany Guindy Campus Chennai 600 025 India
Vengidusamy Narayanan, University of Madras Department of Inorganic Chemistry, School of Chemical Sciences Guindy Campus Chennai 600 025 India
Abstract Near-infrared and mid-infrared spectra of three tellurite minerals have been investigated. The structures and spectral properties
of copper bearing xocomecatlite and tlapallite are compared with an iron bearing rodalquilarite mineral. Two prominent bands
observed at 9,855 and 9,015 cm−1 are assigned to 2B1g → 2B2g and 2B1g → 2A1g transitions of Cu2+ ion in xocomecatlite. The cause of spectral distortion is the result of many cations of Ca, Pb, Cu and Zn in the tlapallite
mineral structure. Rodalquilarite is characterised by ferric ion absorption in the range 12,300–8,800 cm−1. Three water vibrational overtones are observed in xocomecatlite at 7,140, 7,075 and 6,935 cm−1 whereas in tlapallite bands are shifted to lower wavenumbers at 7,135, 7,080 and 6,830 cm−1. The complexity of rodalquilarite spectrum increases with the number of overlapping bands in the near-infrared. The observation
of intense absorption feature near 7,200 cm−1 confirms hydrogen bonding water molecules in xocomecatlite. Weak bands observed near 6,375 and 6,130 cm−1 in tellurites are attributed to the hydrogen bonding between (TeO3)2− and H2O. A number of overlapping bands at low wave numbers 4,800–4,000 cm−1 are caused by combinational modes of tellurite ion. (TeO3)2− stretching vibrations are characterised by three main absorptions at ~1,070, 780 and 665 cm−1.
Content Type Journal Article
DOI 10.1007/s11243-008-9153-0
Authors
Ray L. Frost, Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences GPO Box 2434 Brisbane QLD 4001 Australia
B. Jagannadha Reddy, Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences GPO Box 2434 Brisbane QLD 4001 Australia
Eloise C. Keeffe, Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences GPO Box 2434 Brisbane QLD 4001 Australia
Abstract Blue [{Cu(2,2′-bipy)2}2{α-SiW12O40}] (bipy = bipyridyl) (1) and pale yellow [Mn(2,2′-bipy)3]2[α-SiW12O40] (2) have been synthesized hydrothermally and characterized by IR spectroscopy and single crystal X-ray structure analysis. In
1, the [α-SiW12O40]4− ion acts as a bridge between the two [{Cu(2,2′-bipy)2]2+ moieties via coordination through the terminal oxygen atoms, while in 2, the [Mn(2,2′-bipy)3]2+ ion balances the charge on the polyoxo anion without forming any covalent bond. To the best of our knowledge, this is the
first example of transition metal-mediated transformation of [α-SiW9O34]10− to [α-SiW12O40]4−.
Content Type Journal Article
DOI 10.1007/s11243-008-9139-y
Authors
Rajarshi Chatterjee, Jadavpur University Department of Chemistry Kolkata 700-032 India
Mahammad Ali, Jadavpur University Department of Chemistry Kolkata 700-032 India
Michael G. B. Drew, University of Reading, White knights Department of Chemistry Reading RG6 6AD UK
M. Nethaji, Indian Institute of Science Department of Inorganic and Physical Chemistry Bangalore 560012 India
Swastik Mondal, Indian Association for the Cultivation of Science, Jadavpur University Solid State Physics Department Kolkata 700-032 India
Monika Mukherjee, Indian Association for the Cultivation of Science, Jadavpur University Solid State Physics Department Kolkata 700-032 India
