Cd(II) and Zn(II) coordination polymers constructed from bis-pyridyl-bis-amide and dicarboxylic or tetracarboxylic acid: Synthesis, structures and luminescent properties

Abstract

Four Cd(II) and Zn(II) coordination polymers constructed from bis-pyridyl-bis-amide and dicarboxylic or tetracarboxylic acid, including {[Cd(L1)0.5(1,4-BDC)(H2O)2]·2H2O}n [L1 = N,N'-bis(pyridin-3-ylmethyl)-(1,1′-biphenyl)-4,4′-dicarboxamide; 1,4-H2BDC = benzene-1,4-dicarboxylic acid], 1, {[Zn(L1)(1,4-BDC)]·H2O}n, 2, {[Zn(L2)0.5(1,2,4,5-BTEC)0.5(H2O)]·H2O}n [L2 = N,N’-bis(3-pyridylmethyl)adipoamide; 1,2,4,5-H4BTEC = 1,2,4,5-benzenetetracarboxylic acid], 3, and {[Zn(L3)(1,2,4,5-BTEC)0.5]·H2O}n [L3 = N,N’-bis(3-pyridylmethyl)sebacoamide], 4, are reported, which have been structurally characterized by using single-crystal X-ray crystallography. Complexes 1–––4 form a 2D layer with hcb topology, a 2D layer with 2,4L1 topology, a 3D framework with the gwg topology and a 2D layer with the 4,4L43 topology, respectively, showing the metal effect in 1 and 2 and ligand effect in 3 and 4 on the structural diversity. Moreover, the luminescent properties of 1–––3 are evaluated and 3 exhibits good sensitivity and integrity toward the detection of Fe3+ ion.