Cadmium-Organic Coordination Polymers Based on N-Donor Ligands and Small Anions: Syntheses, Crystal Structures, and Photo luminescent Properties

By using two types of arene core-based rigid N-containing ligands, we have solvothermally synthesized two cadmium metal-organic coordination polymers, {[Cd-6(dpb)(6)(HCOO)(8)(H2O)(4)]center dot 4NO(3)center dot 4H(2)O}(n) (1) and {[Cd-4(tib)(4)(H2O)(4)(NO3)(6)]center dot 2NO(3)}(n) (2) (dpb = 1,4-bis-(4-pyridyl)-benzene, tib = 1,3,5-tris(1-imidazolyl)benzene), and characterized them. The coordinated small anions HCOO- and NO3- play important roles in the formation of 1 and 2. In 1, the coordinated formate ligand from in situ hydrolysis of DMF binds metal centers to generate a rigid 2D metal-formate honeycomb layer, which is further connected by dpb ligands to generate a 3D pillar-layer complex Complex 2 possesses a 2-fold interpenetrating 2D framework with an extremely rare (3,4) connected topology. Photochemical properties of these new complexes have been studied.