Plumbum(II) and Zinc(II) Complexes with 5-Chlorosalicylic Acid: Structure and Propertie

Abstract: Two new transition metal complexes, containing the acidic ligand 5-chlorosalicylic acid (H2L5), and 1,10-phenanthroline（phen） and 1,3-Di(4-pyridyl)propane (bpp) as secondary ligands are reported. They are formulated as {[Pb(HL5)2(phen)(H2O)]·H2O}n(1), [Zn2(HL5)4(bpp)2]n(2). All the complexes are characterized by single-crystal X-ray diffractions. Compoud 1 crystallizes in the triclinic P-1 space group while compoud 2 in the monoclinic system with space group C2/c. In compund 1, the carboxylate group of the coordinated HL5- adopt μ1−η1: η0 coordination fashion to connect one Pb(II) ion but all the carboxylate groups adopt the different μ1−η1: η1 mode in the crystal of compoud 2 compared to 1. In addition, the carboxylate group and Hydroxyl can partly or entirely deprotonated, which makes it possible to coordinating with metal ion or forming hydrogen bonding interactons. Furthermore, the fluorescence property in the solid state and thermal decomposition process were investigated in order to understand the relationships between the structures and the properties.