Syntheses and crystal structures of two Co(II) coordination polymers based on 4,6-bis(4-methylbenzoyl)isophthalic acid and 4,4′-bipyridine

Abstract

Two coordination complexes, [Co₂L₂(4,4′-bpy)₂(H₂O)₄] · 6H₂O (1) and [CoL(4,4′-bpy)] (2) (H₂L = 4,6-bis(4-methylbenzoyl)isophthalic acid and 4,4′-bpy = 4,4′-bipyridine), have been synthesized with the same starting materials under conventional and hydrothermal condition, respectively. Their structures have been characterized by X-ray diffraction, elemental analysis, IR spectra, and thermogravimetric analysis. Complex 1 features a 2-D sheet structure (space group C2/c) with (4,4) grid units. The non-covalent interactions (O–H · · · O, C–H · · · π, and weak π  · · · π interactions) extend 1 into a 3-D supramolecular network. Complex 2 displays a (3,5)-connected network (space group P 1) with a (4² · 6)(4² · 6⁸) topology.

Keywords:

• Coordination polymers
• Cobalt(II)
• 4,6-Bis(4-methylbenzoyl)isophthalic acid
• Crystal structure

Acknowledgments

The authors gratefully acknowledge the financial support by the NSF of China (20771023), 863 Program (2007AA03z218) and analysis and testing foundation of Northeast Normal University.