Synthesis, crystal structures, and characterization of three coordination compounds constructed from 4-sulfophthalic acid ligand

Three new coordination compounds with 4-sulfophthalic acid (H3SPA) ligand, namely {[Pb3(4-SPA)2(H2O)](H2O)}n (1), [Mn(4,4′-bpy)2(H2O)4][Mn2(4-SPA)2-(4,4′-bpy)4(H2O)4]·7.5(H2O) (2) and Cu2(4-HSPA)2(2,2′-bpy)2(H2O)2 (3) (4,4′-bpy = 4,4′-bipyridine and 2,2′-bpy = 2,2′-bipyridine), have been synthesized. The structures exhibit different dimensionality depending on the nature of the metal ions and/or the ancillary ligands. Compound 1 has a 2D layered architecture constructed from one-dimensional inorganic lead(II) oxygen chains containing tetranuclear [Pb4(μ2-O)4] cluster. Compound 2 has a dinuclear manganese [Mn2(4-SPA)2(4,4′-bpy)4(H2O)4] motif charged with mononuclear [Mn(4,4′-bpy)2(H2O)4]2+ cation. Compound 3 is a discrete dinuclear copper(II) structure that linked by extensive hydrogen bonds to form a three-dimensional supramolecular structure. In the solid state, compound 1 exhibits blue photoluminescence with the maximum at 432 nm upon excitation at 350 nm. The temperature-dependent magnetic susceptibility data of 2 have been investigated. The Curie constant C and Weiss constant θ are 3.14 emu K mol−1 and −2.09 K, respectively, revealing antiferromagnetically magnetic interactions between the Mn2+ ions. In addition, these compounds are characterized by powder X-ray diffraction, IR, elemental analysis, and thermogravimetric analysis.