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

Five transition-metal coordination polymers, namely, [Zn₇Cl ₆(oba)₄]_n (1), [Cd₇Cl ₆(oba)₄]_n (2), [Zn(oba)(H₂O)] _n (3), [Ag₂(oba)]_n (4) and [Co(oba)(H ₂O)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 (Cd ₆Cl₇)_n) are connected by oba^2- 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 oba^2- 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.