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

摘要

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 center dot center dot center dot O hydrogen bond interactions. While complexes 2-4 were binuclear unit and crystallizes isomorphically in the triclinic system, space group P-(1) over bar. The binuclear unit were assembled into 1D supramolecular structures through the O-H center dot center dot center dot O hydrogen bond interactions along the a-axis and formed a 2D supramolecular structures through the pi-pi 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. (C) 2019 Elsevier B.V. All rights reserved.