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

Abstract

Two new coordination polymers [Ni(2,4′-oba)(1,10-phen)]_n (1) and {[Ni(2,4′-Hoba)₂ (4,4′- bipy)(H₂O)₂]·2H₂O} _n (2) have been synthesized [2,4′-H₂oba=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 π-π 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 oba²⁻ ligands exhibit two coordination modes to link metal ions: bidentate chelating and monodenate modes.

Keywords:

• crystal structure
• hydrothermal syntheses
• nickel(II) complex

Acknowledgments

The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (20971018) and also the support from Dezhou University.