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| Articles
by
Man-Cheng Hu |
Total Records (
3 ) for
Man-Cheng Hu |
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Guo-Fang Zhang
,
Jiang-Bo She
,
Dong-Dong Li
,
Ji-Zhen Li
,
Qiu-Ping Zhou
,
Yin-Li Dou
,
Xue-Zhong Fan
,
Man-Cheng Hu
and
Zhi-Hong Liu
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Six complexes, rubidium and cesium 3,5-dinitropyrid-2-onate (2DNPO), 3,5-dinitropyrid-4-onate (4NDPO), 3,5-dinitropyrid-4-one-N-hydroxylate (4DNPNO), were synthesized and characterized by elemental analysis, FT-IR, TG-DTG and X-ray single-crystal diffraction analysis. All the complexes crystallized from water and one of them was a hydrate. Rubidium 3,5-dinitropyrid-4-one-N-hydroxylate was crystallized with the 1 : 2 stoichiometry as Rb[H(4DNPNO)2] upon absorption of carbon dioxide. The structural determinations showed that the coordination sphere around a metal centre is made up of oxygen atoms and nitrogen atoms, except for the 4DNPNO complexes, where the coordination sphere accommodates exclusively oxygen atoms. The coordination numbers of the metal centers vary from 8, 10, 11 to 12, while the ligands, each employing its pyridone tautomer, link with metal cations. Bridging oxygen atoms play an important role in construction of two- and/or three-dimensional networks of these complexes. Hydrogen bonding contributes to the connectivity within a given sheet in Rb[H(4DNPNO)2]; aromatic π-π stacking interactions exist only in Cs(4DNPNO). The interactions between metal atoms and ligands are generally very weak. The organization of all layer structures appears to be governed mainly by steric effects and electrostatic forces with very little directional influence of the cations. The thermogravimetric analyses of these complexes showed the following consecutive processes: loss of NO2 groups, collapse of the pyridyl ring backbones and finally inorganic residue formation. These complexes could be used as probes in template effects of heavy alkali-metal cations in the organization of biorelevant ligands and as environment-friendly energetic catalysts in solid propellants. |
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Quan-Guo Zhai
,
Jing-Ping Niu
,
Man-Cheng Hu
,
Yan Wang
,
Wen-Juan Ji
,
Shu-Ni Li
and
Yu-Cheng Jiang
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Two 2-D metal-organic coordination polymers, {[Ag(NH2-BPT)] ·
NO3}n (1) and {[Ag(BPT)] · H2O}n
(2), have been synthesized via self-assembly of AgNO3
and 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole (NH2-BPT) under
hydrothermal conditions by controlling the reaction temperatures. Lower reaction
temperature (140°C) led to formation of 1, which crystallizes in the
monoclinic system, space group C2/c, a = 24.001(3), b
= 15.844(2), and c = 12.981(3) Å, V = 2996.8(6) Å3,
Z = 8. When the temperature was increased to 180°C, in situ
deaminization of the organic ligand led to crystallization of 2 (space
group P21/n, a = 7.3106(10), b = 19.633(2),
and c = 9.0596(16) Å, V = 1190.2(3) Å3, Z
= 4). The NH2-BPT in 1 and BPT in 2 are μ4
tetradentate utilizing two triazolyl and two pyridyl nitrogens, generating an
unusual 2-D layer, in which binuclear Ag(I) motifs and organic ligands are four-connecting
nodes that inter-link in 4462 topology. Adjacent 2-D metal-organic
layers are linked by a system of hydrogen bonds to form 3-D supramolecular frameworks.
Strong blue fluorescence emissions are observed for 1 and 2 in the
solid state at ambient temperature. |
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Xia Gao
,
an-Guo Zhai
,
Xuejing Dui
,
Shu-Ni Li
,
Yu-Cheng Jiang
and
Man-Cheng Hu
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Solvothermal reaction of the flexible ligand 1,6-bi(benzotriazole)hexane (BBTH)
with CuCl generated a 3-D hybrid solid, {[CuCl]2(BBTH)}n
(1), which was investigated by elemental analysis, FT-IR, X-ray powder
diffraction (XRPD), X-ray single-crystal diffraction, TG/DTA, and photoluminescence
measurements. Compound 1 crystallizes in the tetragonal system, space group
I4(1)/a, a = b = 17.636(2) Å, c = 13.5345(15)
Å, V = 4209.6(9) Å3, Z = 8. The distorted
tetrahedral geometry of Cu(I) is defined by two chlorides and two N donors from
different BBTH ligands. Adjacent copper atoms are connected by μ2-Cl
to give a 1-D zigzag inorganic chain, and further linked by BBTH ligands via
μ4-bridging, forming the 3-D hybrid structure of 1. Cu(I)
atoms and BBTH ligands can be regarded as two kinds of non-equivalent 4-connected
nodes, which lead to an unusual topological network with Schläfli symbol of (32.8.92.10)2(32.82.92).
Compound 1 exhibits high thermal stability and shows strong red fluorescence
emission at 538 nm in the solid state at ambient temperature. |
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