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

Three new metal−organic coordination polymers, Cd(bpdc)(phen) 2 ·2H 2 O ( 1 ) (H 2 bpdc = biphenyl-4,4‘-dicarboxylic acid), Cd(BDC)(phen)·DMF ( 2 ) (H 2 BDC = benzene-1,4-dicarboxylic acid), and Cd 2 (btec)(phen) 2 (H 2 O) 2 ( 3 ) (H 4 btec = 1,2,4,5-benzenetetracarboxylic acid), were synthesized under different conditions by using the metal−organic coordination compound Cd(phen) 2 (NO 3 ) 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, P 2/ c space group. The 3-D supramolecular framework 3 crystallizes in the triclinic system, P 1̄ 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.