A supramolecular dimer of two crystallographically independent Co(II) phthalate bipyridine complexes in one single crystal: Synthesis, crystal structure, and thermal studies

Abstract

A cobalt(II) complex with 2,2'-bipyridine and phthalate ligands of the composition [Co(bpy)(Hpht)(H2O)3][Co(bpy)(pht)(H2O)2]Cl·2H2O (bpy: 2,2'-bipyridine; Hpht, pht: o-phtha­late anions) are synthesized and characterized by FT-IR and electronic spectroscopy and single crystal X-ray diffraction. The compound crystallizes in the triclinic system, space group, Z = 2 with a = 11.998(5), b = 13.956(5), c = 14.313(5) Å, α = 112.33(5), β = 95.067(5), γ = 109.166(5)°. The structure consists of a cationic complex unit [Co(bpy)(Hpht)(H2O)3]+, a neutral complex unit [Co(bpy)(pht)(H2O)2], a chloride anion, and two lattice water molecules. The intermolecular O—H⋯O hydrogen bond links two independent Co(II) complexes in the crystal structure, forming a supramolecular dimer. The dimers in the crystal form a 2D layered network structure via weak supramolecular π—π stacking, C—H⋯O, C—H⋯Cl, and O—H⋯Cl hydrogen bonding interactions. The thermal behavior of the compound is investigated.