Assembly, Fluorescent and Adsorption Properties of Two Cadmium(II)/Cobalt(II) Coordination Complexes Functionalized by the Flexible Bis(Pyridyl)-bis(Amide) Ligand

Abstract

A new cadmium(II) and a new cobalt(II) coordination complexes [Cd5(BTB)4(HL)2]·2H2O (1) and [Co(HBTB)(L)]·2H2O (2) [H3BTB = 1,3,5-tri(4-carboxylphenyl)benzene, L = N,N′-bis(3-pyridyl)octandiamide] were prepared under the solvothermal conditions by the assembly of cadmium(II)/cobalt(II) chloride, the flexible bis(pyridyl)-bis(amide) ligand L and the aromatic tricarboxylic acid H3BTB. The structures of complexes 1–2 have been characterized by X-ray single crystal diffraction analyses, infrared spectroscopy (IR), powder X-ray diffraction (PXRD) and thermogravimetric (TG) analyses. Complex 1 is a 3D metal–organic network with the penta-nodal (2,4,4,5,6)-connected {4·63·8·10}2{42·65·83}2{43·63}2{46·89}{6}2 topology constructed from the 3D [Cd5(BTB)4]n2n− coordiantion framework and the protonated HL ligands. Complex 2 displays a binodal (4,4)-connected {64·8·10}{6} topological 2D layered architecture based on the 1D [Co(HBTB)]n chains and the 1D [CoL]n chains, which are further linked by hydrogen bonding interactions to form a 3D supramolecular network. Moreover, the fluorescent properties of the cadmium(II) complex and the dyes adsorption performances of complexes 1–2 have been studied.