Architectural alterations from 1D to 3D coordination polymers based on a pair of isomeric linear and V-shaped triazole/thiophene/triazole bridging ligands
作者:Bin Hu、Yin-Ge Wang、Yuan Dai、Yu-Xin Peng、Wei Huang
DOI:10.1016/j.poly.2014.06.026
日期:2014.11
Four pairs of transition-metal [Co(II), Zn(II), Ni(II) and Cu(I)] coordination polymers have been prepared and characterized based on a pair of isomeric linear and V-shaped rigid thiophene-centered ditriazole bridging ligands [2,5-di(1H-1,2,4-triazol-1-yl)thiophene (L1) and 3,4-di(1H-1,2,4-triazol-1-yl)thiophene (L2)]. They are formulated as [Co(L1)(2)(H2O)(2)](ClO4)(2)}(n) (1), [Zn(L1)(2)(H2O)(2)](ClO4)(2)}(n) (2), [Ni(L1)(2) (H2O)(2)](ClO4)(2)}(n) (3), [Co(L2)(2)(H2O)(2)](ClO4)(2)}(n) (4), [Zn(L2)(2)(H2O)(2)](ClO4)(2)}(n) (5), [Ni(L2)(2) (H2O)(2)](ClO4)(2)}(n) (6), [Cu(L1)(CN)](n) (7) and [Cu-2(L2)(SCN)(2)](n) (8), where distinct metal/ligand ratios (1:2, 1:1 and 2:1) and dimensions [one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D)] have been observed because of the alterations of the coordination modes of central metal ions, the shape and conformation of ligands and the participancy of counterions. X-ray single-crystal diffraction analyses reveal that 1D chains have been formed in the cases of 4-6, while 2D planes have been built in 1-3. In contrast, 3D networks have been constructed in 7 and 8 with different topologies because of the further linkage of CN- and SCN- counterions. (C) 2014 Elsevier Ltd. All rights reserved.