Anion-tunable architectures of Zn(II) complexes of a bis-pyridyl-bis-amide ligand: Syntheses, crystal structures and properties
作者:Rui-Ying Wang、Lian Wu、Ya-Hui Yu、Xiao-Xia Zhang、Ben-Lai Wu、Hong-Yun Zhang
DOI:10.1016/j.poly.2012.07.038
日期:2012.9
Through natural evaporation of the reaction solutions of ZnX2 (X = Cl-, CH3COO- and SCN-) and the ligand 2,6-bis(pyridine-4-carboxamido)pyridine (L), three new coordination compounds, [Zn(L)(Cl)(2)](n)center dot nCH(3)OH center dot nH(2)O (1), [Zn(L)(CH3COO)(2)](2) (2) and [Zn(L)(3)(SCN)(2)](n) (3) have been obtained. In these zinc(II) complexes, ligand L displays various conformers and coordination modes to fabricate the helical chain of 1, the discrete dimer of 2 and the zigzag chain of 3, with the coordination number of Zn-II varying from 4 for 1, 5 for 2 to 6 for 3. Through complementary amide hydrogen bonds, their structures are extended into chiral layers, 1D ribbons and a 3D supramolecular network, respectively. Interestingly, the coordination numbers of Zn-II, as well as the molecular and supramolecular structures of the resulting coordination complexes, are obviously tuned with the X anion used. Additionally, the TGA of 1 and 2 as well as the fluorescence of the free ligand L and 1 were measured in the solid state. (C) 2012 Elsevier Ltd. All rights reserved.