Syntheses, structures and properties of three novel Cu(II) coordination compounds based on 4,4′-oxybisbenzoic acid

Abstract Three Cu(Ⅱ) coordination compounds (CCs) with 4,4′-oxybisbenzoic acid (H2OBBA), {Cu3(OBBA)2(NH3)4}n (1), {Cu(OBBA)0.5(NH3)}n (2), {Cu2(OBBA) (NH3) (OH)}n (3) were synthesized under the ammoniacal condition in mixed solvents and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, elemental analysis and Fourier transform infrared spectra. Crystallographic studies have shown that, CC 1 is a 1D wavy chain structure, while the intermolecular connection of hydrogen bonds made it a 2D layered structure; CC 2 is a 2D layered structure composed of a 1D wavy chain structure and the O–H⋯N hydrogen bonds of R (2)2 (12) hydrogen bond motifs; CC 3 forms a 3D supramolecular framework through OH−, OBBA ligand and hydrogen bonds, in which, OBBA ligand has two cyclic patterns: C–OM―O and C–O―M, O⋯H–N. It may be concluded that OBBA ligands and hydrogen bonds play important role in the formation of multiple architectures. The photoluminescence and thermal behavior were also studied.