Assembly, structure and properties of three new multifunctional complexes derived from the naphthalene-based bis(pyridyl)-bis(amide) and benzenetricarboxylic acid

Three new metal(II)–organic coordination complexes, formula as [Cd3(btc)2(3-dpna)2(H2O)2]·8H2O (1), [Zn3(btc)2(3-dpna)2(H2O)2]·4H2O (2) and [Co3(btc)2(3-dpna)2(H2O)2]·2H2O (3) [3-dpna = N1,N4-di(pyridin-3-yl)naphthalene-1,4-dicarboxamide, H3btc = 1,2,4-benzenetricarboxylic acid], have been successfully synthesized by the hydrothermal methods. Complexes 13 exhibit similar 3D coordination networks based on the [M3(btc)2(H2O)2]n [M = Cd(II) for 1, Zn(II) for 2, Co(II) for 3] layers and the μ2-bridging 3-dpna ligand containing the naphthalene-bridging group, representing a 4,4,4-connected {42.64}4{64.82} topology. The photocatalyitc properties of complexes 13 toward degrading organic dyes, the fluorescent of complexes 13 and the fluorescent sensing activities of complexes 12 toward detecting metal ions have been studied. Additionally, the electrochemical and electrocatalytic properties of complex 3 have been investigated.