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(H_2O)_4]·2H_2O}_n (2, H_3btc = 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-H...O hydrogen bonds and π-π 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.