Syntheses, Crystal Structures and Luminescent Properties of Lead(II) and Cadmium(II) Coordination Polymers Constructed from Biphenyl-2,5,3′-tricarboxylate

Two coordination polymers, namely [Pb(Hbtc)(phen)](n) (1) and {{Cd-3(btc)(2)(H2O)center dot 2H(2)O}(n) (2, H(3)btc = biphenyl-2,5,3'-tricarboxylic acid, phen = 1,10-phenanthroline), were assembled. Single-crystal X-ray diffraction studies show that compound 1 possesses a zigzag chain 1D coordination network, which is further extended into a 3D supramolecular architecture via O-(HO)-O-... hydrogen bonds and pi-pi packing interactions. Compound 2 features a 3D open framework based on a tricadmium(II) subunit, generating a trinodal 4,4,6-connected net with the 4,4,6T24 topology defined by the point symbol of (4(4).6(2))(3)(4(6).6(9))(2). Thermal stability and luminescent properties of both compounds were studied and discussed.