Crystal engineering of Cd(II) metal-organic frameworks bridged by dicarboxylates and N-donor coligands

Two new metal-organic coordination polymers, {[Cd-4(bpea)(4)(IP)(8)]center dot 6H(2)O}(n) (1) and {[Cd-1.5(suc)(1.5)(IP)(1.5)]center dot 4H(2)O}(n) (2) (bpea = biphenylethene-4,4'-dicarboxylate, H(2)suc = succinic acid and IP = 1H-imidazo[4,5-f][1,10]-phenanthroline), have been obtained through two types of dicarboxylate linkers. Complex 1 contains a neutral 2-D puckered sheet that is interdigitated by neutral 1-D zigzag chains. Compound 2 shows a 2-D (4,4) net, which is extended into a 3-D supramolecular framework by weak aromatic interactions. The different structures demonstrate the effect of the dicarboxylate ligands on the formation of such coordination architectures. The fluorescence property of the two complexes was also investigated.