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Journal of Coordination Chemistry Volume 67, 2014 - Issue 5
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Original Articles

Synthesis, structures, and fluorescent properties of two oxalato-bridged dinuclear zinc(II) complexes with tridentate and tetradentate polybenzimidazole ligands

Li-Qin LiDepartment of Chemistry, Capital Normal University, Beijing, China
,
Meng LiDepartment of Chemistry, Capital Normal University, Beijing, China
,
He ZhangDepartment of Chemistry, Capital Normal University, Beijing, China
,
Shuo LiDepartment of Chemistry, Capital Normal University, Beijing, China
&
Feng-Mei NieDepartment of Chemistry, Capital Normal University, Beijing, ChinaCorrespondence[email protected]
Pages 847-856 | Received 11 Oct 2013, Accepted 11 Feb 2014, Published online: 23 Apr 2014
 
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Abstract

Two dinuclear oxalato-bridged zinc(II) complexes, [Zn2(bbma)2(μ2-η4-ox)](ClO4)2 (1) and [Zn2(ntb)2(μ2-η2-ox)](ClO4)2·4CH3OH (2), containing tridentate and tetradentate polybenzimidazole ligands were synthesized, where bbma is bis(benzimidazol-2-yl-methyl)amine and ntb is tris(2-benzimidazolylmethyl)amine. They were characterized by single-crystal X-ray diffraction, elemental analysis, IR, and fluorescence spectroscopy. Zinc(II) complexes in 1 and 2 are five-coordinate in distorted trigonal bipyramidal geometry. Oxalate bridges two zinc(II) ions as a bis-bidentate chelate in 1, while bis-monodentate in 2. The Zn⋯Zn distances are 5.318(1) Å for 1 and 7.1295(5) Å for 2, respectively. 1-D chain structures are formed in 2 by intermolecular hydrogen bonds. The solid state fluorescence spectra have been studied for 1 and 2.

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