From a 1-D Chain, 2-D Layered Network to a 3-D Supramolecular Framework Constructed from a Metal−Organic Coordination Compound

Abstract

Three new metal−organic coordination polymers, Cd(bpdc)(phen)2·2H2O (1) (H2bpdc = biphenyl-4,4‘-dicarboxylic acid), Cd(BDC)(phen)·DMF (2) (H2BDC = benzene-1,4-dicarboxylic acid), and Cd2(btec)(phen)2(H2O)2 (3) (H4btec = 1,2,4,5-benzenetetracarboxylic acid), were synthesized under different conditions by using the metal−organic coordination compound Cd(phen)2(NO3)2 as the metal source instead of inorganic metal salt. Polymer 1 is a 1-D zigzag chain, which crystallizes in the monoclinic system, Cc space group. Polymer 2 is a 2-D layered network, which crystallizes in the monoclinic system, P2/c space group. The 3-D supramolecular framework 3 crystallizes in the triclinic system, P1̄ space group. The particular interest of 3 is two entirely independent cadmium atoms in its structure. They separately form 1-D polymeric chains, which are alternately arranged to form a 3-D supramolecular framework through interchain hydrogen bonds. Additionally, these three compounds show strong fluorescence in the solid state at room temperature.