Synthesis, crystal structure, thermal, luminescent property and antibacterial activity of lanthanide ternary complexes with p-chlorobenzoic acid and 5,5′-dimethyl-2,2′-bipyridine

Abstract

Four novel lanthanide coordination complexes, [La(p-ClBA)3(5,5′-DM-2,2′-bipy)H2O]n (1), [Ln(p-ClBA)3(5,5′-DM-2,2′-bipy)H2O]2 (Ln = Sm 2, Eu 3, Gd 4) were obtained from the reaction between p-chlorobenzoic acid (p-ClHBA), 5,5′-dimethyl-2,2′-bipyridine (5,5′-DM-2,2′-bipy) and lanthanide nitrate under solvothermal conditions. Single crystal X-ray diffraction analysis showed that complex 1 is a 1D chain structure, crystallized in the monoclinic system, space group P2(1)/n, and formed a 2D sheet through the C–H⋯O hydrogen bond interactions. While complexes 2–4 were binuclear unit and crystallizes isomorphically in the triclinic system, space group Pī. The binuclear unit were assembled into 1D supramolecular structures through the O–H⋯O hydrogen bond interactions along the a-axis and formed a 2D supramolecular structures through the π-π stacking interactions along the b-axis. The thermal analysis of four complexes were studied by TG-DSC/FTIR. The solid state photoluminescent properties of complex 3 were investigated at room temperature. Moreover, the antibacterial activities of complexes 1–4 on Candida albicans were studied.