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

Abstract

Five new complexes, namely, {[Zn(L)(L1)]·(H 2 O)(DMF) 2 } n ( 1 ), {Cd(L)(L1) 0.5 } n ( 2 ), {[Zn 2 (L) 2 (L2) 2 ]·DMF} n ( 3 ), {[Zn(L)(L3)]·(H 2 O) 5 } n ( 4 ), and {[Cd 2 (L) 2 (L3) 1.5 (H 2 O)] 2 ·H 2 O} n ( 5 ), have been synthesized by the solvothermal reaction of 4,4′-(hexafluoroisopropylidene)bis(benzoic acid) (H 2 L) 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 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 and M helices 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.