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6. A vanadium-containing iron-sulfur cluster with a V2Fe2S4 cubane-like core. Synthesis, structure, and characterization of (Et4N)(V2Fe2S4(Me2dtc)5)

Author

Deng, Yuheng, Liu, Qiutian, Yang, Yu, Wang, Youtong, Cai, Yuanba, Wu, Daxu, Chen, Changneng, Liao, Daizheng, Kang, Beisheng, and Lu, Jiaxi

Subjects
Coordination compounds -- Research, Vanadium -- Research, Copper compounds -- Research, Chemistry
Abstract

A cubane-type cluster (Et4N)(V2Fe2S4(Me2dtc)5) was synthesized from an assembly system VS(sub 4)(super 3-)/FeCl2/Me2dtc-/PhS- and structurally characterized. The cuboidal core was found to contain vanadium and iron atoms with an oxidation state of +3. The chemical shift of 51V NMR was found to be at -391 ppm. The FAB-MS revealed bond breaking of the cluster core.

Published
1997

7. Solid state synthesis, crystal structure, decomposition reactions, and optical nonlinearity of a twin-nest-shaped cluster compound, [Et4N4]4[Mo2O2S6Cu6I6]

Author

Hou, Hongwei, Long, Deliang, Xin, Xinquan, Huang, Xiaoxing, Kang, Beisheng, Ge, Ping, Ji, Wei, and Shi, Shu

Subjects
Transition metal compounds -- Analysis, Chemical structure -- Analysis, Chemistry
Abstract

The cluster ion, [Et4N]4[Mo2O2S6Cu6I6], is composed of two nest-shaped fragments of [MoOS3Cu3I3]2- that are connected together by a four-membered Cu(I)2Cu ring. The fragments are composed of I atoms that are connected to three Cu atoms and a terminal O atom that is connected to a Mo atom. The cubane-like [MoOS3Cu3I(PPh3)3] cluster is formed by the reaction of the twin-nest-shaped cluster compound with PPh3. The cluster ion also exhibits linear and nonlinear optical properties that are characteristic of other nest-shaped clusters.

Published
1996

12. Syntheses of a new type of chiral phosphines from glucose

Author

Wang Hanqing, Lu Ge-Tan, Wen Ting-Bin, Liu Qiutian, Shi Ji-Cheng, Kang Beisheng, Wu Da-Xu, Hong Maochun, and Lü Shi-Jie

Subjects
chemistry.chemical_compound, Stereospecificity, Chemistry, Regioselectivity, Organic chemistry, General Chemistry, Phosphine
Abstract

Methyl 3-deoxy-3-(diphenylphosphino)-4,6-O-benzylidene-α-D-altropyranoside (1) and methyl 2-deoxy-2-(diphenylphosphino)-4,6-O-benzylidene-α-D-altropyranoside (2) were prepared from methyl 2,3-anhydro-4,6-O-benzylidene-O-D-mannopyranoside and methyl 2,3-anhydro-4,6-O-benzylidene-α-D-allopyranoside, respectively, via regioselective and stereospecific ring-opening reactions in high yields. Compounds 1 and 2 were oxidized to give the corresponding phosphine oxides (S and 4).

Published
2010

14. Synthesis and structural characterization of two novel heteronuclear cluster compounds, [NEt4]4[WS4Cu5Br7] and

Author

Cai Jin-Hua, Kang Beisheng, Xin Xinquan, Lang Jianping, Weiyang Zhou, and Yu Kaibei

Subjects
Substitution reaction, Stereochemistry, Chemistry, Crystal structure, Inorganic Chemistry, Crystallography, chemistry.chemical_compound, Heteronuclear molecule, Octahedron, X-ray crystallography, Pyridine, Materials Chemistry, Cluster (physics), Molecule, Physical and Theoretical Chemistry
Abstract

The title compounds have been obtained by the reaction of [NH 4 ] 2 (WS 4 , CuBr, [NEt 4 ] 4 Br and [Bu n 4 N]Br in the solid state ( 1 ), or by the reaction of [NH 4 ] 2 [WS 4 ], CuI and [Bu n 4 N]I in the solid state and the pyridine substitution of the solid-state product in acetonitrile ( 2 ). X-ray diffraction analysis confirms that in the structure of 1 five of the six edges of the [WS 4 ] 2− tetrahedron are coordinated by CuBr units forming an open, double cubane-like structure, which possesses crystallographically imposed C 2 symmetry. The structure of 2 , which possesses a crystallographic 4 symmetry axis situated at the tungsten atom, consists of a tetrahedral WS 4 core enveloped by an octahedral array of six copper atoms, forming a WS 4 Cu 6 aggregate. Linked by Cu eq ICu eq  bridges, this aggregate connects with its nearest neighbours and develops a two-dimensional network. The substitution reactions of the solid-state product with pyridine are discussed.

Published
1993

15. Heteronuclear W(Mo)CuS complexes of dialkyldithiocarbamate. Syntheses of (Et4N)2[MCu3S4(dtcR2)3] and structures of (Et4N)2[MCu3S4(dtcC5H10)3]· DMF (M = W or Mo)

Author

Liu Qiutian, Liu Hanqin, Liu Jiangnan, Kang Beisheng, Huang Zhiying, Lei Xinjian, and Hong Maochun

Subjects
Chemistry, Stereochemistry, Ligand, Infrared spectroscopy, Tetrahedral molecular geometry, Crystal structure, Triclinic crystal system, Inorganic Chemistry, Crystallography, Heteronuclear molecule, X-ray crystallography, Materials Chemistry, Molecule, Physical and Theoretical Chemistry
Abstract

Compounds (Et4N)2[MCu3S4(dtcR2)3] (M=W (1) or Mo (2); R2  C5H10 (a), Et2 (b) or C4H8 (c) were synthesized by the reaction of (Et4N)2MS4 and CuCl in the presence of NadtcR2 in DMF. The crystal and molecular structures of 1a·DMF and 2a·DMF were determined from X-ray diffraction data. The compounds are isomorphous and crystallize in the triclinic space group P 1 with unit cell parameters for 1a(2a)·DMF: a=12.047(0) (12.053(2)), b= 17.620(3) (17.650(5)), c=14.514(1) (14.533(4)) A; α=100.83(9) (100.43(3)), β=115.41(3) (115.47(2)), γ=79.49(8) (79.78(2))°; V=2715.9 (2727.8) A3, Z=2 (2), and Dx=1.611 (1.497) g/cm3. The final R values converged to 0.048 and 0.067 for M=W and Mo respectively. [p ]The four metal atoms MCu3 are coplanar with the central tetrahedron of MS4 preserved. Each Cu(I) ion is coordinated to two inorganic S atoms from MS4 and two organic S atoms from one dtcC5H10 ligand in a distorted tetrahedral geometry. Infrared spectra showed two stretching vibrations at 430–442 cm− for μ3-SM and 455–463 cm−1 for μ2-SM. The compounds are diamagnetic and show reversible one-electron oxidation-reduction at E1/2 = 0.55 V (2a).

Published
1990

25. 1,4-Bis(benzimidazol-2-yl)butane

Author

Chen, Chunlong, primary, Su, Chengyong, additional, Xu, Anwu, additional, Zhang, Huaxin, additional, Feng, Xiaolong, additional, and Kang, Beisheng, additional

Published
2002
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