Synthesis, Crystal Structure, and Characterization of a Novel One-Dimensional Helical Chain Cobalt(II) Coordination Polymer

Abstract

A novel one-dimensional (1D) helical chain polymer, {[CoL₂(H₂O)](H₃O)(ClO₄)}_n (1) (HL = 4-N-(2′-pyridylimine)benzoic acid), was synthesized by reaction of Co(II) perchlorate with L anion in ethanol solution, and characterized by element analyses, infrared spectroscopy, and X-ray single-crystal diffraction. In this structure, the Co²⁺ ion is in a distorted octahedral geometry, an infinite 1D helical chain was constructed by L ligand through bidentate-monodentate bridging modes and are further assembled into three-dimensional supramolecular networks through complicated O–H···O hydrogen bonding interactions.

Keywords:

• 4-N-(2′-pyridylimine)benzoic acid
• Co(II) complexes
• crystal structure
• 1D helical chain
• 3D framework

Acknowledgments

The authors are grateful to the Innovation Team Foundation of Hebei Normal University of Science and Technology (Grant No. CXTD2010–02) for financial support.