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Jia H.,Zhengzhou University | Jia H.,Zhengzhou Kindergarten Teachers College | Li Y.,Zhengzhou University | Xiong Z.,Zhengzhou University | And 2 more authors.
Dalton Transactions | Year: 2014

Five metal-organic frameworks, namely, [Mn3(H 2DMPhIDC)2(HDMPhIDC)2(bpp)]n (H 3DMPhIDC = 2-(3,4-dimethylphenyl)-1H-imidazole-4,5-dicarboxylic acid, bpp = 1,3-di(4-pyridyl)propane) (1), [Pb4(DMPhIDC) 2(OH)2]n (2), [Cd(HDMPhIDC)(en)]n (en = ethylenediamine) (3), [Cu3(HDMPhIDC)3(Py) 3]n (Py = pyridine) (4) and {[Zn2(HDMPhIDC) 2(Phen)2]2·H2O}n (Phen = 1,10-phenanthroline) (5) have been hydro(solvo)thermally synthesized and structurally characterized by single-crystal X-ray diffraction, elemental and thermal analyses and IR spectra. Polymer 1 displays a 3D noninterpenetrated framework with 1D open channels. Polymer 2 exhibits a stepped (4,4,4,4,6,6)-connect 2D topology. Polymer 3 is a left-handed helix chain. Polymers 4 and 5 arrange the 3D supramolecular networks containing a 1D corrugated chain via π⋯π stacking or hydrogen bond interactions. In these MOFs, the imidazole dicarboxylate ligand shows various coordination modes and strong coordination ability. Furthermore, the solid-state luminescent properties of the polymers have also been discussed. © 2014 The Royal Society of Chemistry.


Geng Z.,Henan Normal University | Dai H.,Zhengzhou Kindergarten Teachers College | Chen X.,Henan Normal University | Wei S.,Henan Normal University | Xia C.,Henan Normal University
Superlattices and Microstructures | Year: 2013

Based on the effective mass approximation, the laser field effects on exciton states and optical properties in the direct-gap Ge/SiGe quantum well (QW) are investigated by means of a variational method. Numerical results show that the ground-state exciton binding energy and the emission energy are dependent highly on the well width and laser field amplitude in the direct-gap Ge/SiGe QW. The laser field decreases the exciton binding energy, however, it also increases the emission energy in the QW for any well width. In particularly, our results also show that the laser field has remarkable effects on exciton states and optical properties in the direct-gap Ge/SiGe QW with the small well width case. © 2013 Elsevier Ltd. All rights reserved.


Ma W.-J.,Zhengzhou University | Ma W.-J.,Zhengzhou Kindergarten Teachers College | Gao Z.-Y.,Zhengzhou University | Zhu S.,Zhengzhou University | Wu B.-L.,Zhengzhou University
Polyhedron | Year: 2014

Tetranuclear square grids, namely, [Cd4(L-O)4] ·1.5DMF (1), [Ni4(L-O)4]·H2O (2), [Zn4(L-O)4]·3H2O (3), [Zn 4(L-O)4] (4), [Cu4(L-O)4] ·H2O (5), and {[Cu4(L-O)4][Cu 4(L-O)4]}·2.5DMF·1.5H2O (6) (DMF = N,N-dimethylformamide, H2L-O = 2,6-bis(pyrazine-2-carboxamido) pyridine-N-oxide), formed by the reactions of M ions (M = CdII, NiII, ZnII and CuII) with pyridyldicarboxamide ligands 2,6-bis(pyrazine-2-carboxamido)pyridine (H2L), was fully characterized. Notably, the central pyridines of ligands H2L were oxidized into pyridine-N-oxides under air conditions, producing the new anionic ligands (L-O)2- to fabricate those grids. In those square grids every octahedrally coordinated metal node is chelated by two doubly deprotonated ligands (L-O)2- in the mer configuration, and each ligand (L-O) 2- acts as a rigid bis(tridentate) linker with the N carboxamide and one Npyrazine in each arm chelating metal ions plus the O atom in the pyridine-N-oxide group bridging the two bound M ions. The CdII and ZnII grids show uncommonly-excellent thermal stabilities and interesting green emissions. Magnetic studies upon grid [Ni4(L-O)4] suggest an antiferromagnetic coupling between the adjacent NiII mainly exchanged through μ-O with a coupling constant of J = -15.06 cm-1. © 2014 Published by Elsevier Ltd.


Jia H.,Zhengzhou University | Jia H.,Zhengzhou Kindergarten Teachers College | Luo X.,Zhengzhou University | Ma B.,Zhengzhou University | And 2 more authors.
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2015

A novel coordination polymer, {[Mn3(3-m-MePhIDC)2(H2O)6]·3H2O}n (1), has been synthesized by hydrothermal reaction, employing 2-(m-methylphenyl)-1H-imidazole-4,5-dicarboxylic acid (m-MePhH3IDC) as organic ligand, and characterized by single-crystal X-ray diffraction, elemental analysis, PXRD, and IR spectra. It crystallizes in trigonal R3 space group and exhibits a 3D honeycomb-like framework constructed from Mn(II) ions and m-MePhIDC3- units. The thermal and magnetic properties of compound 1 have been investigated as well. © 2015 Taylor & Francis Group, LLC.


Jia H.,Zhengzhou University | Jia H.,Zhengzhou Kindergarten Teachers College | Guo M.,Zhengzhou University | Ma B.,Zhengzhou University | And 2 more authors.
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2013

A novel coordination polymer, namely {[Co3(HEIDC) 2(4,4′-bipy)3]·2NO3·6H 2O} n (1), has been hydrothermally successfully synthesized by the reaction of 2-ethyl-1H-imidazole-4,5-dicarboxylic acid (H3EIDC) with Co(NO3)2·6H2O in the presence of 4,4′-bipyridine (4,4′-bipy). The single-crystal structural study reveals that 1 is a 3D metal-organic framework, which can be viewed as made up of [Co3(HEIDC)2(4,4′-bipy) 3] n units, nitrate anions and solvent water molecules. Its thermal properties have been determined as well. Copyright © Taylor & Francis Group, LLC.

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