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

摘要

Five new complexes, namely, {[Zn(L)(L1)] ? (H_2O)(DMF)_2}_n (1), {Cd(L)(L1)_(0.5)}_n (2), {[Zn_2(L)_2(L_2)_2] ? DMF}_n (3), {[Zn(L)(L3)] ? (H_2O)_5}_n (4), and {[Cd_2(L)_2(L3)_(1.5)(H_2O)]_2 ? H_2O}_n (5), have been synthesized by the solvothermal reaction of 4,40-(hexafluoroisopropylidene)bis(benzoic acid) (H_2L) with different transition metal ions in the presence of ancillary ligands 1,4-bis(imidazol-1-ylmethyl)benzene (L1), 4,40-bis(imidazol-1-ylmethyl)-biphenyl (L2), and 4,40-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 L~(2-) and L1 ligands into a non-interpenetrated three-dimensional structure. Complex 3 possesses a 2D framework which is generated by joining both P andMhelices by L~(2-) ligands. The structure of 4 is a three-dimensional (3D) framework with {4~2.6.8~3} net containing meso-helices, while 5 is a 2D structure with {4~(14).6} net. The photoluminescent properties of 1-5 have been studied in the solid state at room temperature.