Synthesis, Structures, and Properties of NiII, CoII, CuII, MnII, and ZnII Coordination Polymers Based on 5-Aminoisophthalate and 4-Amino-3,5-bis(3-pyridyl)-1,2,4-triazole

Self-assembly of 5-amino-isophthalic acid (H2aip) and 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole (3-bpt) with Ni(NO3)2, Co(ClO4)2, Cu(NO3)2, Mn(OAc)2, and Zn(NO3)2, respectively, under similar reaction condition affords five new coordination polymers {[M(3-bpt)(aip)(H2O)2]·(H2O)2}n (M = Ni for 1, Co for 2, Cu for 3, Mn for 4, and Zn for 5). Single-crystal X-ray diffraction indicates that coordination polymers 1–5 show isostructural 1D double-chain structures, and the metal centers exhibit the same octahedral coordination environment. The carboxyl groups of ligand aip2− adopt the same bis-monodentate bridging mode in all structures. These low-dimensional coordination motifs in 1–5 are further extended to the resultant three-dimensional (3D) supramolecular networks via H-bonding interactions. Furthermore, FT-IR spectroscopy, elemental analyses and thermogravimetric analysis (TGA) for 1–5 have also been studied in this article.