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beruecksichtige naturwissenschaftliche Journale:
Crystal Research and Technology - published by
Wiley-Interscience -
... is an international journal examining all aspects of research within experimental, industrial, and theoretical crystallography.
CrystEngComm - published by
The Royal Society of Chemistry -
... has established itself as THE journal in which to publish cutting-edge crystal engineering research.
Journal of Chemical Crystallography - published by
Springer -
... is an international and interdisciplinary publication dedicated to the rapid dissemination of research results in the general areas of crystallography and spectroscopy.
Crystallography Reports - published by
Springer -
... publishes original papers, short communications, and reviews on different aspects of crystallography.
Aktuelle wissenschaftliche Fachartikel der
genannten Journale:
Balakrishna R. Bhogala, Sreekanth K. Chandran, L. Sreenivas Reddy, Ranjit Thakuria, Ashwini Nangia
(Communication from CrystEngComm)
Balakrishna R. Bhogala, CrystEngComm, 2008, DOI: 10.1039/b808923j
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The content of this RSS Feed (c) The Royal Society of Chemistry
Christopher J. Adams, Mukhtar A. Kurawa, Matteo Lusi, A. Guy Orpen
(Paper from CrystEngComm)
Christopher J. Adams, CrystEngComm, 2008, DOI: 10.1039/b809950b
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The content of this RSS Feed (c) The Royal Society of Chemistry
Shu-Ming Zhang, Tong-Liang Hu, Jian-Rong Li, Jian-Long Du, Xian-He Bu
(Paper from CrystEngComm)
Shu-Ming Zhang, CrystEngComm, 2008, DOI: 10.1039/b807485b
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The content of this RSS Feed (c) The Royal Society of Chemistry
Hong Wang, Yao-Yu Wang, Guo-Ping Yang, Cui-Juan Wang, Gui-Lin Wen, Qi-Zhen Shi, Stuart R. Batten
(Paper from CrystEngComm)
Hong Wang, CrystEngComm, 2008, DOI: 10.1039/b805727c
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The content of this RSS Feed (c) The Royal Society of Chemistry
Jacqueline Hamblin, Stephen P. Argent, Alexander J. Blake, Claire Wilson, Neil R. Champness
(Paper from CrystEngComm)
Jacqueline Hamblin, CrystEngComm, 2008, DOI: 10.1039/b811462e
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The content of this RSS Feed (c) The Royal Society of Chemistry
Guoli Zheng, Feng Zhang, Yinyan Li, Hongjie Zhang
(Paper from CrystEngComm)
Guoli Zheng, CrystEngComm, 2008, DOI: 10.1039/b805628e
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The content of this RSS Feed (c) The Royal Society of Chemistry
Wei Li, Zhan-Feng Ju, Qing-Xia Yao, Jie Zhang
(Communication from CrystEngComm)
Wei Li, CrystEngComm, 2008, DOI: 10.1039/b809627a
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The content of this RSS Feed (c) The Royal Society of Chemistry
Tanya K. Ronson, Michaele J. Hardie
(Communication from CrystEngComm)
Tanya K. Ronson, CrystEngComm, 2008, DOI: 10.1039/b810090j
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The content of this RSS Feed (c) The Royal Society of Chemistry
Abstract The proton-transfer molecular adducts cytosine/isoorotic acid (1:1) dihydrate (CytIsor) and cytosine/maleic hydrazide (2:2)
dihydrate (CytMal) have been studied by X-ray diffraction methods. CytIsor crystallizes in the orthorhombic system, space
group Pbnb, a = 7.4859 (4), b = 12.7977 (9), c = 26.4573 (16) Å, V = 2534.7 (3) Å3. CytMal crystallizes in the triclinic system, space group P − 1, a = 6.7767 (9), b = 12.063 (2), c = 12.937 (3) Å, α = 78.58 (2), β = 75.87 (2), γ = 75.63 (1)°, V = 982.8 (3) Å3. In both compounds protonation occurs at the N3 atom of the cytosine aminooxo tautomer as a result of the proton-transfer
process from the acidic hydroxy groups of the counterions. In the crystal structure, both cocrystals are stabilized by a plethora
of N–H···O, N–H···N and O–H···O hydrogen bonds. It is shown the ability of cytosine to form large organic assemblies, with
the appropriate guest, due to solid-state recognition involving synthons based on hydrogen bonding between functional groups
as sites of proton-transfer reactions.
Index Abstract The proton-transfer molecular adducts of cytosine with isoorotic acid and with maleic hydrazide have been synthesized in the
solid state and their hydrogen-bonding patterns have been studied by X-ray diffraction methods.
Content Type Journal Article
Category Original Paper
DOI 10.1007/s10870-008-9457-0
Authors
Gustavo Portalone, University of Rome I ‘La Sapienza’ Department of Chemistry P. le Aldo Moro, 5 00185 Rome Italy
Marcello Colapietro, University of Rome I ‘La Sapienza’ Department of Chemistry P. le Aldo Moro, 5 00185 Rome Italy
Abstract Individually prepared, equivalent amounts of 2,5-bis-(4-pyridyl)-1,3,4-oxadiazole (4-BPO) and benzenehexacarboxylic acid (mellitic
acid, MA) when mixed, deposited long rods, whose X-ray structure showed a unique assembly of 40 membered planar modules composed
from two alternating units each of MA and 4-BPO, rather than the anticipated helical profile. Several novel features of complexes
of MA with organic molecules are seen here. In almost all cases the intermolecular hydrogen bonding between MA anions is so
stable that the MA anions and the complementary cations lie in separate planes. This barrier is overcome in the present case.
The basic module associates to form quartets by very simple hydrogen bonding of the carboxylic groups of MA. The quartet assembly
is characterized by the rotation of the left hand pair compared to the right hand pair. The mode of the macromolecular assembly
is clear, that is, they are layered in alternating planes. Space group: P21/c with a = 9.181(1) Å, b = 9.624(1) Å, c = 29.390(2) Å, and β = 94.626(4)°. The modules are embedded in an extensively hydrogen bonded MA network. The assembly profile of MA and 4-BPO
is unique and should be a harbinger for the design of novel functional assemblies. The 40-membered module mimics the self-assemblies
of peptides and can be important in the design of “Haptens” from simple molecules.
Index Abstract Rod like crystals from water that are formed on mixing MA and 4-BPO are shown to consist of 4-molecule modules (MA–4-BPO–MA–4-BPO–)
that contain a 40-membered ring, MA–BPO.
Content Type Journal Article
Category Original Paper
DOI 10.1007/s10870-008-9458-z
Authors
Isabella L. Karle, Laboratory for the Structure of Matter, Naval Research Laboratory Code 6030, 4555 Overlook Avenue, SW Washington DC 20375-5341 USA
Y. B. R. D. Rajesh, Indian Institute of Chemical Technology Discovery Laboratory, Organic III Hyderabad 500 607 India
Subramania Ranganathan, Indian Institute of Chemical Technology Discovery Laboratory, Organic III Hyderabad 500 607 India
Ying Cui, Man-Li Cao, Li-Fei Yang, Yan-Li Niu, Bao-Hui Ye
(Communication from CrystEngComm)
Ying Cui, CrystEngComm, 2008, DOI: 10.1039/b809511f
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The content of this RSS Feed (c) The Royal Society of Chemistry
Masaru Kato, Takashi Fujihara, Daisaku Yano, Akira Nagasawa
(Paper from CrystEngComm)
Masaru Kato, CrystEngComm, 2008, DOI: 10.1039/b810652p
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The content of this RSS Feed (c) The Royal Society of Chemistry
Abstract The synthesis, NMR and X-ray structure of 4-methyl-6H-pyrido[3,2,1-jk]carbazol-6-one—a potential DNA intercalator are reported. The compound crystallizes in the orthorhombic Pbca space group with unit cell parameters: a = 7.775(8), b = 15.113(7), c = 19.849(7) Å, V = 2332.8(3) Å3, Mr = 233.26 and Z = 8. In the three-dimensional arrangement of the molecules no classical hydrogen bonds were found; weak π···π and C–H···O
interactions are responsible for the packing of the molecules in the crystal structure.
Index Abstract In the three-dimensional arrangement of the title compound no classical hydrogen bonds were found; weak π···π and C–H···O
interactions are responsible for the packing of the molecules in the crystal structure.
Content Type Journal Article
Category Original Paper
DOI 10.1007/s10870-008-9459-y
Authors
Boris Shivachev, University of Pittsburgh Department of Structural Biology 3501 5-th ave. Pittsburgh 15260 USA
Petar Petrov, University of Sofia Department of Organic Chemistry, Faculty of Chemistry 1126 Sofia Bulgaria
Malinka Stoyanova, Bulgarian Academy of Sciences Institute of Organic Chemistry Acad. G. Bonchev Str., Build. 9 1113 Sofia Bulgaria
Abstract The molecular structure of [Cu2(MeCN)2(μ-tpy)2][BPh4]2 has been determined. The two terpyridine ligands coordinate to the same Cu(I) center in a bidentate configuration, in which
the copper adopted a distorted tetrahedral geometry with the four nitrogen donors. The third ring of each terpyridine ligand
forms a bridge with a second Cu(I) center, whose tetrahedral coordination sphere is completed by two acetonitrile ligands.
The resulting structure represents a section of a double helix. Crystal data: space group C2/c, a = 27.202(5), b = 12.995(3), c = 23.409(5) Å, β = 123.13(3)°; V = 6930(2) Å3, Z = 4, R = 0.0613, wR2 = 0.0946.
Graphical Abstract The molecular structure of [Cu2(MeCN)2(μ-tpy)2][BPh4]2 has been determined. The terpyridine ligands coordinate in a bidentate fashion to the same Cu center and monodentate to a
second Cu center resulting in a double helical structural motif.
Content Type Journal Article
Category Communication
DOI 10.1007/s10870-008-9456-1
Authors
John J. Allen, Rice University Department of Chemistry 6100 Main Street Houston TX 77005 USA
Andrew R. Barron, Rice University Department of Chemistry 6100 Main Street Houston TX 77005 USA
Abstract The molecular structure of quinolin-1-(2-quinolyl)-2-one mesitylimine has been determined. The Buchwald-Hartwig amination
of mesitylaniline with two equivalents of 2-chloroquinoline results in dearomatization of one quinoline heterocycle, forming
an imine with the mesitylaniline nitrogen and aminating the second 2-chloroquinoline via the cyclic nitrogen. The mesityl
and quinoline moieties are nearly perpendicular to the plane of the central quinolyl structure. Rationalization of the imine
formation is found by a consideration of the relative stability of the syn and anti conformations of the reaction intermediate. Crystal data: space group P21/c, a = 12.609(3), b = 15.010(3), c = 12.456(3) Å, β = 112.68(3)°; V = 2,175.3(8) Å3, Z = 4, R = 0.0649, wR2 = 0.1498.
Graphical Abstract The amination of mesitylaniline with two equivalents of 2-chloroquinoline results in dearomatization of one quinoline heterocycle,
forming an imine with the mesitylaniline nitrogen and aminating the second 2-chloroquinoline via the cyclic nitrogen.
Content Type Journal Article
Category Communication
DOI 10.1007/s10870-008-9455-2
Authors
John J. Allen, Rice University Department of Chemistry 6100 Main Street Houston TX 77005 USA
Christopher E. Hamilton, Rice University Department of Chemistry 6100 Main Street Houston TX 77005 USA
Andrew R. Barron, Rice University Department of Chemistry 6100 Main Street Houston TX 77005 USA
Jorge L. Sague, Markus Meuwly, Katharina M. Fromm
(Paper from CrystEngComm)
Jorge L. Sague, CrystEngComm, 2008, DOI: 10.1039/b803158d
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The content of this RSS Feed (c) The Royal Society of Chemistry
N. N. Adarsh, D. Krishna Kumar, Parthasarathi Dastidar
(Paper from CrystEngComm)
N. N. Adarsh, CrystEngComm, 2008, DOI: 10.1039/b803410a
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The content of this RSS Feed (c) The Royal Society of Chemistry
Pallab Mondal, Anirban Karmakar, W. Marjit Singh, Jubaraj B. Baruah
(Paper from CrystEngComm)
Pallab Mondal, CrystEngComm, 2008, DOI: 10.1039/b808399a
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The content of this RSS Feed (c) The Royal Society of Chemistry
Wei-Xiong Zhang, Wei Xue, Jian-Bin Lin, Yan-Zhen Zheng, Xiao-Ming Chen
(Paper from CrystEngComm)
Wei-Xiong Zhang, CrystEngComm, 2008, DOI: 10.1039/b809838g
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The content of this RSS Feed (c) The Royal Society of Chemistry
Guang-Xiang Liu, Heng Xu, Xiao-Ming Ren, Wei-Yin Sun
(Paper from CrystEngComm)
Guang-Xiang Liu, CrystEngComm, 2008, DOI: 10.1039/b808390h
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The content of this RSS Feed (c) The Royal Society of Chemistry
Qing-Feng Yang, Xiao-Bing Cui, Jie-Hui Yu, Jing Lu, Xiao-Yang Yu, Xiao Zhang, Ji-Qing Xu, Qin Hou, Tie-Gang Wang
(Paper from CrystEngComm)
Qing-Feng Yang, CrystEngComm, 2008, DOI: 10.1039/b806980h
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The content of this RSS Feed (c) The Royal Society of Chemistry
Jun Harada, Mayuko Harakawa, Keiichiro Ogawa
(Paper from CrystEngComm)
Jun Harada, CrystEngComm, 2008, DOI: 10.1039/b811220g
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The content of this RSS Feed (c) The Royal Society of Chemistry
Paul Smart, Guillermo Minguez Espallargas, Lee Brammer
(Paper from CrystEngComm)
Paul Smart, CrystEngComm, 2008, DOI: 10.1039/b806765a
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The content of this RSS Feed (c) The Royal Society of Chemistry
Laurent Allan Baumes, Manuel Moliner, Nicolas Nicoloyannis, Avelino Corma
(Communication from CrystEngComm)
Laurent Allan Baumes, CrystEngComm, 2008, DOI: 10.1039/b812395k
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The content of this RSS Feed (c) The Royal Society of Chemistry
Abstract The title compound, N-1, 3-Dithiolan-2-ylidene-N′-[1-furan-2-yl-meth-(E)-ylidene]-hydrazine was synthesized via furfural with
2-hydrazono-1, 3-dithiolane and characterized by elemental analysis, 1H NMR, 13C NMR, IR, UV–Vis and single crystal XRD. The crystal belongs to orthorhombic, space group F212121 with unit cell parameters a = 6.4035(9) Å, b = 11.8835(16) Å, c = 12.3809(17) Å, V = 942.1(2) Å3, Z = 4, Dc = 1.497, Mr = 212.28, μ = 0.523 mm−1, F(000) = 440, R1 = 0.0243, and wR2 = 0.0602. The molecule is the anti-rotamer of the trans-isomer and every molecule forms zig-zag C(7) chains via C–H···N inter-molecular
hydrogen-bond [H···N = 2.74 Å, C···N = 3.354(3) Å and C–H···N = 142°] running parallel to the [010] direction. At the same
time many molecules self-assemble the left-handed spiral C(7) chains and inverse ones via the S···O short contacts [S···O = 3.1867(13) Å]
along a axis.
Index Abstract The title compound was synthesized and characterized by elemental analysis, 1H NMR, 13C NMR, IR, UV–Vis and single crystal XRD.
Content Type Journal Article
Category Communication
DOI 10.1007/s10870-008-9450-7
Authors
Yong-Hong Liu, Yangzhou University College of Chemistry and Chemical Engineer Yangzhou 225002 People’s Republic of China
Zhi-Gang Li, Tianshui Institute for Drug Control Tianshui 741018 People’s Republic of China
Ling-Juan Yang, Tianshui Normal University College of Life and Chemistry Tianshui 741001 People’s Republic of China
Xiao-Lan Liu, Yangzhou University College of Chemistry and Chemical Engineer Yangzhou 225002 People’s Republic of China
Abstract Catalysts of Pt/WOx–ZrO2 type with 1 wt% of Pt and 10, 15 and 20 wt% of tungsten were synthesized and characterized. The structural and morphological
features of these catalysts were studied. The samples were synthesized by impregnation method and calcined at 600 °C, 700 °C
and 800 °C. The characterizations were carried out using different techniques: X-ray diffraction, Raman spectroscopy, scanning
electronic microscopy, nitrogen adsorption measurement and refinement of their crystalline structures by Rietveld method.
X-ray diffraction patterns revealed the formation ZrO2 and WO3 crystalline structures and its crystallite size were determined. The zirconium oxide crystallized into tetragonal and monoclinic
phases and tungsten trioxide crystallized into monoclinic phase. Crystalline WO3 and amorphous WOx species were detected by Raman spectra.
Index Abstract Catalysts of Pt/WOx–ZrO2 type with 1 wt% of Pt and 10, 15 and 20 wt% of tungsten were synthesized and characterized. The structural and morphological
features of these catalysts were studied. The samples were synthesized by impregnation method and calcined at 600 °C, 700 °C
and 800 °C. The characterizations were carried out using different techniques: X-ray diffraction, Raman spectroscopy, scanning
electronic microscopy, nitrogen adsorption measurement and refinement of their crystalline structures by Rietveld method.
X-ray diffraction patterns revealed the formation ZrO2 and WO3 crystalline structures and its crystalline size were determined. The zirconium oxide crystallized into tetragonal and monoclinic
phases and tungsten trioxide crystallized into monoclinic phase. Crystalline WO3 and amorphous WOx species were detected by Raman spectra.
Content Type Journal Article
Category Original Paper
DOI 10.1007/s10870-008-9454-3
Authors
A. M. Garrido Pedrosa, Federal University of Rio Grande do Norte Department of Chemistry CP 1662 Natal RN 59078-970 Brazil
D. M. A. Melo, Federal University of Rio Grande do Norte Department of Chemistry CP 1662 Natal RN 59078-970 Brazil
M. J. B. Souza, Federal University of Sergipe Department of Chemical Engineering Sao Cristovao SE 49000-100 Brazil
A. S. Araujo, Federal University of Rio Grande do Norte Department of Chemistry CP 1662 Natal RN 59078-970 Brazil
S. H. Lima, Federal University of Rio Grande do Norte Department of Chemistry CP 1662 Natal RN 59078-970 Brazil
M. A. F. Melo, Federal University of Rio Grande do Norte Department of Chemistry CP 1662 Natal RN 59078-970 Brazil
J. M. Sasaki, Federal University of Ceará Department of Physics CP 6030 Fortaleza CE 60455-760 Brazil
Russell D. L. Johnstone, Duncan Francis, Alistair R. Lennie, William G. Marshall, Stephen A. Moggach, Simon Parsons, Elna Pidcock, John E. Warren
(Paper from CrystEngComm)
Russell D. L. Johnstone, CrystEngComm, 2008, DOI: 10.1039/b810746g
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The content of this RSS Feed (c) The Royal Society of Chemistry
Thomas Gelbrich, David S. Hughes, Michael B. Hursthouse, Terence L. Threlfall
(Paper from CrystEngComm)
Thomas Gelbrich, CrystEngComm, 2008, DOI: 10.1039/b807898j
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The content of this RSS Feed (c) The Royal Society of Chemistry
Dimitra Kovala-Demertzi, Joanna Wiecek, John C. Plakatouras, Zbigniew Ciunik
(Communication from CrystEngComm)
Dimitra Kovala-Demertzi, CrystEngComm, 2008, DOI: 10.1039/b809216h
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The content of this RSS Feed (c) The Royal Society of Chemistry
Barbara Piotrkowska, Aleksandra Wasilewska, Maria Gdaniec, Tadeusz Polonski
(Paper from CrystEngComm)
Barbara Piotrkowska, CrystEngComm, 2008, DOI: 10.1039/b806061d
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The content of this RSS Feed (c) The Royal Society of Chemistry
Andreas Lemmerer, Susan A. Bourne, Manuel A. Fernandes
(Paper from CrystEngComm)
Andreas Lemmerer, CrystEngComm, 2008, DOI: 10.1039/b811789f
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The content of this RSS Feed (c) The Royal Society of Chemistry
Wentao Ai, Haiyan He, Longjie Liu, Qianjin Liu, Xiaoli Lv, Jing Li, Daofeng Sun
(Paper from CrystEngComm)
Wentao Ai, CrystEngComm, 2008, DOI: 10.1039/b805379k
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The content of this RSS Feed (c) The Royal Society of Chemistry
Li-Zhi Zhang, Wen Gu, Zhili Dong, Xin Liu, Bing Li
(Communication from CrystEngComm)
Li-Zhi Zhang, CrystEngComm, 2008, DOI: 10.1039/b808085b
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The content of this RSS Feed (c) The Royal Society of Chemistry
Andrew D. Burrows, Kevin Cassar, Mary F. Mahon, Sean P. Rigby, John E. Warren
(Paper from CrystEngComm)
Andrew D. Burrows, CrystEngComm, 2008, DOI: 10.1039/b808350a
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The content of this RSS Feed (c) The Royal Society of Chemistry
Abstract A new 18-membered macrocycle Schiff base dinuclear copper(II) complex: Cu2(NO3)4(APTY)4 (1) (APTY = 1,5-dimethyl-2-phenyl-4-{[(1E)-pyridine-4-ylmethylene]amino}-1,2-dihydro-3H-pyrazol-3-one), has been successfully synthesized by solvothermal treatment of Cu(NO3)2 · 6H2O with APTY. Compound 1 crystallizes in the triclinic space group P-1 with cell parameters: a = 10.556(2) Å, b = 12.075(2) Å, c = 15.230(3) Å, α = 74.75(3), β = 81.50(3), γ = 70.60(3)°, V = 1762.7(6) Å3, R1 = 0.0493, wR2 = 0.1400, Z = 1, Dcalc = 1.455 g/cm3, F(000) = 798, S = 1.009. In the compound molecules, each of the six-coordinated CuII atoms are bridged by APTY ligands into 18-membered macrocycle, and each the Cu2+ atoms exhibits a significantly distorted octahedral geometry. The crystal packing is stabilized by C–H···O hydrogen-bonding
interactions into a three-dimensional supramolecular framework.
Index Abstract A new 18-membered macrocycle Schiff base dinuclear copper(II) complex: Cu2(NO3)4(APTY)4 (1), has been successfully synthesized by solvothermal treatment (APTY = 1,5-dimethyl-2-phenyl-4-{[(1E)-pyridine-4-ylmethylene]amino}-1,2-dihydro-3H-pyrazol-3-one). The six-coordinated Cu2+ atom exhibit significantly distorted octahedral geometry. The crystal packing is stabilized by C–H···O hydrogen-bonding interactions
into a three-dimensional supramolecular framework.
Content Type Journal Article
Category Original Paper
DOI 10.1007/s10870-008-9451-6
Authors
Hong-Yun Jin, China University of Geoscience Faculty of Material Science and Chemical Engineering Wuhan 430074 People’s Republic of China
Jing-Zhong Chen, China University of Geoscience Faculty of Material Science and Chemical Engineering Wuhan 430074 People’s Republic of China
Xian-Wen Wang, China University of Geoscience Faculty of Material Science and Chemical Engineering Wuhan 430074 People’s Republic of China
Shu-En Hou, China University of Geoscience Faculty of Material Science and Chemical Engineering Wuhan 430074 People’s Republic of China
Abstract The inclusion compounds of 14-hydroxy-14-toluenyldibenzo[a:j]xanthene (H) with the guests acetone (H·ACE), pyridine (H·PYR) and N,N-dimethylformamide (H·DMF) were all successfully solved in the triclinic spacegroup P-1 with unit cell dimensions for H·ACE: a = 9.415(2) Å, b = 9.730(2) Å, c = 12.994(3) Å, α = 82.65(3), β = 76.69(3), γ = 88.67(3), Z = 2; for H·PYR: a = 9.482(2) Å, b = 10.169(2) Å, c = 13.089(3) Å, α = 106.59(3), β = 95.91(3), γ = 90.35(3), Z = 2 and for H·DMF: a = 9.537(19) Å, b = 10.055(2) Å, c = 13.129(3) Å, α = 79.18(3), β = 74.42(3), γ = 86.46(3), Z = 2. The thermal stabilities
for all compounds were investigated and in particular the kinetics of desolvation for the DMF compound was determined using
both isothermal and non-isothermal methods.
Index Abstract The host compound 14-hydroxy-14-toluenyldibenzo[a:j]xanthene forms inclusion compounds with the guests acetone, pyridine and
N,N-dimethylformamide. The crystal structures were determined and their thermal stabilities investigated. The kinetics of
desolvation for the DMF compound was determined using both isothermal and non-isothermal methods.
Content Type Journal Article
Category Original Paper
DOI 10.1007/s10870-008-9447-2
Authors
Ayesha Jacobs, Cape Peninsula University of Technology Department of Chemistry, Cape Town Campus P.O. Box 652 Cape Town 8000 South Africa
Serwalo M. Makgosi, Cape Peninsula University of Technology Department of Chemistry, Cape Town Campus P.O. Box 652 Cape Town 8000 South Africa
Luigi R. Nassimbeni, Cape Peninsula University of Technology Department of Chemistry, Cape Town Campus P.O. Box 652 Cape Town 8000 South Africa
Jana H. Taljaard, Nelson Mandela Metropolitan University Department of Chemistry Port Elizabeth 6000 South Africa
Abstract The influence of X-rays of different wavelength on the degree of structural quality of K(Cl, Br) crystals of mixed composition
grown from aqueous solutions is considered. It is found by the methods of chemical etching, X-ray analysis, pycnometric density,
and atomic-force microscopy that X-ray irradiation leads to the formation of crystals with a more perfect substructure and
surface morphology and a decrease of the dislocation density and concentration of pores and cavities containing the mother
liquor. It is shown that X-ray irradiation can promote preferential incorporation of less electronegative components into
the crystal lattice of a solid solution.
Content Type Journal Article
Category Crystal Growth
DOI 10.1134/S1063774508040263
Authors
V. M. Anishchik, Belarussian State University pr. Nezavisimosty 4 Minsk 220030 Belarus
N. G. Val’ko, Grodno State University ul. Ozheshko 22 Grodno 230023 Belarus
V. V. Voĭna, Grodno State University ul. Ozheshko 22 Grodno 230023 Belarus
A. S. Vorontsov, Grodno State University ul. Ozheshko 22 Grodno 230023 Belarus
Abstract The features of doping of KDP crystals with cerium ions and organocerium complexes with alizarin complexon and arsenazo III
have been investigated. It is established that “direct” doping by introducing cerium salts into the initial solution cannot
be implemented. The effect of organometallic complexes of cerium on the crystal growth has been studied. Organocerium complexes
predominantly enter the prismatic or pyramidal growth sectors. It is shown that the complex arsenazo III + Ce blocks the growth
of the prismatic sector. Cerium-doped KDP crystals exhibit a photoluminescence band peaking at the wavelength λmax= 350 nm.
Content Type Journal Article
Category Crystal Growth
DOI 10.1134/S1063774508040251
Authors
A. P. Voronov, National Academy of Sciences of Ukraine Institute for Single Crystals pr. Lenina 60 Kharkov 61001 Ukraine
G. N. Babenko, National Academy of Sciences of Ukraine Institute for Single Crystals pr. Lenina 60 Kharkov 61001 Ukraine
V. M. Puzikov, National Academy of Sciences of Ukraine Institute for Single Crystals pr. Lenina 60 Kharkov 61001 Ukraine
A. D. Roshal’, Kharkov National University Kharkiv 61077 Ukraine
V. I. Salo, National Academy of Sciences of Ukraine Institute for Single Crystals pr. Lenina 60 Kharkov 61001 Ukraine
Abstract Temperature dependences of the dielectric anisotropy ɛa, effective rotational viscosity
~
g
, and elastic modulus K11 of the nematic phase of the tetrapalladium organyl-pentadecane system containing 55 wt % pentadecane have been experimentally
studied. The quantities ɛa,
~
g
, and K11 are shown to decrease: ɛa decreases by a factor of about 2.5;
~
g
, by almost two orders of magnitude; and K11, by more than an order of magnitude. It is found that an applied electric field induces growth of tetrapalladium organyl
crystals at 6–9°C above the nematic-crystallosolvate phase transition temperature.
Content Type Journal Article
Category Liquid Crystals
DOI 10.1134/S1063774508040238
Authors
A. V. Golovanov, Russian Academy of Sciences Nesmeyanov Institute of Organoelement Compounds ul. Vavilova 28 Moscow 119991 Russia
A. N. Gaidadin, Volgograd State Technical University pr. Lenina 28 Volgograd 400066 Russia
G. V. Ryabchuk, Volgograd State Technical University pr. Lenina 28 Volgograd 400066 Russia
Abstract Methods of growth of KTiOPO4 and K1 − xRbxTiOPO4 crystals of high optical quality have been optimized. The dielectric properties (permittivity and conductivity) of the crystals
grown have been investigated at frequencies from 102 to 106 Hz in the temperature range from 100 to 350 K, along the [001] crystallographic direction. It is established that partial
substitution of K+ ions with Rb+ ions leads to a decrease in the permittivity and conductivity.
Content Type Journal Article
Category Physical Properties of Crystals
DOI 10.1134/S1063774508040214
Authors
V. G. Gurtovoĭ, National Academy of Sciences of Belarus Institute of Solid-State and Semiconductor Physics ul. Petrusya Brovki 17 Minsk 220072 Belarus
A. U. Sheleg, National Academy of Sciences of Belarus Institute of Solid-State and Semiconductor Physics ul. Petrusya Brovki 17 Minsk 220072 Belarus
S. A. Guretskiĭ, National Academy of Sciences of Belarus Institute of Solid-State and Semiconductor Physics ul. Petrusya Brovki 17 Minsk 220072 Belarus
N. A. Kalanda, National Academy of Sciences of Belarus Institute of Solid-State and Semiconductor Physics ul. Petrusya Brovki 17 Minsk 220072 Belarus
Abstract Specific features of UV lasing in low-dimensional zinc oxide materials have been investigated. Two main types of lasers, differing
in the feedback formation mechanism-classical random lasers and microlasers—have been selected in active disordered zinc oxide
materials. In the first case, feedback is provided by strong light backscattering, and a large number of scattering particles
are involved in the cavity formation. In the second case, each crystallite operates as an individual microlaser. The main
lasing spectral parameters are reported for the distinguished types of lasers.
Content Type Journal Article
Category Physical Properties of Crystals
DOI 10.1134/S1063774508040196
Authors
L. E. Li, Russian Academy of Sciences Shubnikov Institute of Crystallography Leninskiĭ pr. 59 Moscow 119333 Russia
L. N. Demyanets, Russian Academy of Sciences Shubnikov Institute of Crystallography Leninskiĭ pr. 59 Moscow 119333 Russia
Abstract The three-dimensional structure of ceruloplasmin (CP) with unoccupied labile metal-binding sites and the structure of CP containing
Ni2+ in the labile sites were solved for the first time at 2.6 and 2.95 Å resolution, respectively. Crystallization was performed
with the use of storage-stable CP, which was prepared in the presence of proteinase inhibitors and purified from (pre)proteinases.
Ceruloplasmin with Ni2+ crystallized in the orthorhombic space group, which had been earlier unknown for CP. Ceruloplasmin with the unoccupied labile
sites crystallized in the trigonal crystal form. The differences in intermolecular contacts observed in the trigonal and orthorhombic
crystal structures of CP are considered. The conformational changes attendant upon Ni2+ binding are described. It was suggested that the labile sites are multifunctional and can both bind metal ions potentially
toxic to organisms and be involved in electron transfer from substrates to the active site.
Content Type Journal Article
Category Structures of Macromolecular Compounds
DOI 10.1134/S1063774508040172
Authors
V. R. Samygina, Russian Academy of Sciences Shubnikov Institute of Crystallography Leninskiĭ pr. 59 Moscow 119333 Russia
A. V. Sokolov, Russian Academy of Medical Sciences Institute of Experimental Medicine ul. Akademica Pavlova 12 St. Petersburg 107376 Russia
M. O. Pulina, Russian Academy of Medical Sciences Institute of Experimental Medicine ul. Akademica Pavlova 12 St. Petersburg 107376 Russia
H. D. Bartunik, Max Planck Unit for Structural Molecular Biology at DESY Notkestrasse 85 D-22607 Hamburg Germany
V. B. Vasil’ev, Russian Academy of Medical Sciences Institute of Experimental Medicine ul. Akademica Pavlova 12 St. Petersburg 107376 Russia
