Zn(II) and Cd(II) coordination polymers with a new angular bis-pyridyl-bis-amide: synthesis, structures and sensing properties

Zn(II) and Cd(II) coordination polymers constructed from a new angular bis-pyridyl-bis-amide ligand and naphthalene-1,4-dicarboxylic acid (1,4-H2NDC), {[Zn-2(L)(1,4-NDC)(2)]center dot 2H(2)O} [L = 4,4'-oxybis(N-(pyridin-3-ylmethyl)benzamide)], 1, and {[Cd-2(L)(1,4-NDC)(2)]center dot EtOH}, 2, have been solvothermally synthesized and structurally characterized by using single-crystal X-ray diffraction. While complex 1 displays a 2D double layer with the rare (4(6).6(4))-5 L4 topology, complex 2 shows a 3D framework with a new (4.5.6)(4(5).5(5).6(9).7.8) topology. Both complexes 1 and 2 display luminescence properties and 2 exhibits a high sensitivity toward the detection of Fe3+ ions with a K-sv value of 1.9 x 10(4) M-1. The quenching effect can most probably be ascribed to the interactions between the metal ions and the amide carbonyl oxygen atoms.

Automated summary

New Zn(II) and Cd(II) coordination polymers were synthesized using a novel ligand and naphthalene-1,4-dicarboxylic acid, displaying 2D and 3D structures. Both complexes exhibited luminescent properties, with complex 2 showing high sensitivity towards Fe3+ ions. The quenching effect is likely due to interactions between metal ions and amide carbonyl oxygen atoms.