Different dimensional coordination polymers with 4,4׳-oxybis(benzoate): Syntheses, structures and properties

Abstract

Five transition-metal coordination polymers, namely, [Zn7Cl6(oba)4]n (1), [Cd7Cl6(oba)4]n (2), [Zn(oba)(H2O)]n (3), [Ag2(oba)]n (4) and [Co(oba)(H2O)2]n (5) (H2oba=4,4′-oxydibenzoic acid), have been achieved under hydrothermal conditions and structurally characterized by IR, elemental analyses, X-ray single-crystal diffraction and TGA. The X-ray single-crystal diffraction reveals that compounds 1 and 2 are isomorphism, featuring pillared-layer 3D motifs, in which the 2D inorganic layers (Zn6Cl7)n (or (Cd6Cl7)n) are connected by oba2− pillars. Compound 3 exhibits 1D stair-like chain and extends to a 3D network by two different interchain O–H–O hydrogen bonding interactions while compound 4 features wave chains and stretches to 2D layer by interchain Ag–O weak contacts. Compound 5 shows 2D network in which Co-chains are pillared by oba2− ligand and then forms a 3D network by four different O–H–O hydrogen bonding interactions. Furthermore, 1–4 exhibit luminescent properties at a solid state and 5 shows antiferromagnetic behavior.