Two new coordination polymers constructed by 1,4-bis(2-methylimidazol-3-ium-1-yl)biphenyl and dicarboxylate ligands: from a twofold interpenetrated pcu topological net to a 2-D+2-D→3-D polycatenated framework

Two new coordination polymers, [Cd(ADC)(bmib)0.5]_n (1) and [Ni(obb)(bmib)]_n (2) [H₂ADC = 1,3-adamantanedicarboxylic acid, bmib = 1,4-bis(2-methylimidazol-3-ium-1-yl)biphenyl and H₂obb = 4,4′-oxybis(benzoic acid)], have been obtained from hydrothermal reactions. Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectroscopy, and powder X-ray diffraction. Complex 1 exhibits a 3-D twofold interpenetrated six-connected (4¹²·6³)-pcu net based on dinuclear Cd(II) units. Complex 2 exhibits a 2-D+2-D→3-D polycatenated framework based on 2-D (4⁴·6²)-sql net. Luminescence of 1 is investigated in the solid state at room temperature and the magnetic properties of 2 are investigated.