Anion-dependent copper(II) coordination polymers based on 1,3-di-(1,2,4-triazole-4-yl)benzene: Syntheses and crystal structures

Three Cu(II) coordination polymers, namely {[Cu(Dtb)(H2O)](SO4)(H2O)} (n) (I), {[Cu(Dtb)(C2O4)(H2O)](H2O)(2)} (n) (II), and {[Cu(Dtb)(NO3)](NO3)(H2O)(2)} (n) (III) (Dtb = 1,3-di-(1,2,4-triazole-4-yl)benzene), have been synthesized under hydrothermal conditions and characterized by elemental analyses, IR spectra, and single-crystal X-ray diffraction (CIF file CCDC nos. 1001347 (I); 1001348 (II); 1001349 (III)). Complex I is a 1D double-chain structure, Dtb acts as mu(1,1')-bridging ligand and SO (4) (2-) does not participate in coordination. In contrast, complex II shows a 1D single-chain, in which Dtb shows mu(1,2')-bridges mode and C2O (4) (2-) occupies two coordination positions. In complex III, NO (3) (-) shortens the distance of two Cu(II) centers by bridging coordination interaction, so Dtb becomes mu(1, 1', 2, 2')-bridges linker to extend the Cu(II) centers to the resulting 2D layer.