Syntheses, characterization and properties of three coordination polymers with interpenetrating structures comprising 4,4'-(1-1,2,4-triazol-1-yl)methylene-bis(benzonic acid).

Three new coordination polymers (CPs), {Pb(tmdb)} (1), {[Zn(tmdb)(bimb)]} (2) and {Zn(tmdb)(bpmb)} (3) (Htmdb = 4,4'-(1-1,2,4-triazol-1-yl)methylene-bis(benzonic acid), where bpmb = 1,4-bis(pyridin-4-ylmethoxy)benzene and bimb = 1,4-bis(imidazoly-1-yl)benzene), have been solvothermally or hydrothermally synthesized. Compound 1 is a 2D network with the point symbol (4·6·8)(4·6) and compound 2 is a 4-fold interpenetrating 3D network with spiral chains. The topological type of 2 is (topos&RCSR.ttd) with the point symbol (4·8)(4·8). Compound 3 is a 3-fold interpenetrating 3D network with the point symbol (6)(8·6)(10·6)(8·10·6). The electrochemiluminescence (ECL) behaviors of 2 and 3 were studied. The applications of CP 2 and 3 in detecting ions were explored, and the results show that they can be used as fluorescent probes to selectively detect and identify Fe ions in water. In addition, the applications of CP 2 and 3 in the adsorption and separation of dyes were researched. Furthermore, the gas adsorption of 3 was studied.