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Effect of Different Imidazole Ancillary Ligands on Supramolecular Architectures of a Series of Zn(II) and Cd(II) Complexes with a Bent Dicarboxylate Ligand

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posted on 02.02.2011, 00:00 by Chang-Chun Ji, Ling Qin, Yi-Zhi Li, Zi-Jian Guo, He-Gen Zheng
Five new complexes, namely, {[Zn(L)(L1)]·(H2O)(DMF)2}n (1), {Cd(L)(L1)0.5}n (2), {[Zn2(L)2(L2)2]·DMF}n (3), {[Zn(L)(L3)]·(H2O)5}n (4), and {[Cd2(L)2(L3)1.5(H2O)]2·H2O}n (5), have been synthesized by the solvothermal reaction of 4,4′-(hexafluoroisopropylidene)bis(benzoic acid) (H2L) with different transition metal ions in the presence of ancillary ligands 1,4-bis(imidazol-1-ylmethyl)benzene (L1), 4,4′-bis(imidazol-1-ylmethyl)-biphenyl (L2), and 4,4′-bis(benzimidazol-1-ylmethyl)biphenyl (L3). Complex 1 displays a two-dimensional (2D) framework containing two kinds of ring units. In complex 2, one-dimensional (1D) Cd chains are assembled by L2− and L1 ligands into a non-interpenetrated three-dimensional structure. Complex 3 possesses a 2D framework which is generated by joining both P and M helices by L2− ligands. The structure of 4 is a three-dimensional (3D) framework with {42.6.83} net containing meso-helices, while 5 is a 2D structure with {414.6} net. The photoluminescent properties of 15 have been studied in the solid state at room temperature.