Syntheses, Structures and Properties of Co(II) and Co(II)/Zn(II) Coordination Polymers Based on Flexible Tris(imidazole) and Multicarboxylate Ligands

摘要

Two coordination polymers, namely, Co(BPDA)(titmb)center dot 3H(2)O (1) and CoZn(BTC)(titmb)Br (2) (titmb = 1,3,5-tris(1-imidazol-1-ylmethyl)-2,4,6-trimethylbenzene, H(2)BPDA = 4,4'-carbonyldibenzoic acid and H3BTC = 1,3,5-benzenetricarboxylic acid), have been synthesized and characterized by elemental analyses, infrared spectra (IR), thermogravimetric analyses (TGA) and single-crystal X-ray diffraction. Single crystal structure analysis shows that complex 1 exhibits a three-dimensional (3D) twofold interpenetrating architecture with a very rare (3,5)-connected fsc-3,5-Cmce-2 topology, while complex 2 features an interesting three-dimensional (3D) (3,6)-connected framework by self-penetration of two sets of (10,3)-a nets with an unprecedented (6(3))(2)(6(12) center dot 8(3)) topology. The results reveal that the carboxylic building blocks play a significant role in promoting the diversity of the observed structural motifs. Two complexes indicate high thermal stabilities. The emission in the blue region indicates that complexes 1 and 2 appear to be good candidate for a promising blue-light-emitting materials. Moreover, complex 1 has also modest power SHG activity.