Hydrothermal Synthesis of Two Ni(II) Metal-Organic Coordination Polymers Constructed From Dicarboxylate and Nitrogen-Contained Ligands

Two new coordination polymers [Ni(2,4'-oba)(1,10-phen)](n) (1) and {[Ni(2,4'-Hoba)(2) (4,4'-bipy)(H2O)(2)]center dot 2H(2)O}(n) (2) have been synthesized [2,4'-H(2)oba=2-(4-carboxyphenoxy)benzoic acid, 1,10-phen=1,10-phenanthroline and 4,4'-bipy=4,4'-bipyridine]. The framework structures of these polymeric complexes have been determined by single-crystal X-ray diffraction studies. Complex 1 exhibits double-helical chains formed by pi-pi stacking interactions from the phenyl rings of the 1,10-phen ligands. Complex 2 forms a two-dimensional supramolecular architecture directed by hydrogen bonding. In compounds 1 and 2, the oba(2-) ligands exhibit two coordination modes to link metal ions: bidentate chelating and monodenate modes.