A cobalt(II) coordination polymer constructed with the 2-carboxy-phenoxyacetate linker showing a corrugated layer structure: synthesis, structure analysis and magnetic properties

摘要

A new binary Co-II coordination polymer, [Co(2-cpa)(2)(H2O)](n) (1) has been synthesized by a hydrothermal reaction of cobalt(II) acetate tetrahydrate and 2-carboxyphenoxyacetic acid (2-H(2)cpa) in the presence of potassium hydroxide. Structural analysis revealed that the central Co(II )ion is in an octahedral geometry coordinated with one aqua and five oxygen atoms of three 2-carboxy-phenoxyacetate (2-cpa) ligands. The 2-cpa anions function as pentadentate double bridging chelate-mu(3) linkers binding neighboring Co-II ions together, to form an unusual corrugated (4,4)-connected layer. Variable-temperature magnetic susceptibility data in the 2-300 K temperature range indicates a weak antiferromagnetic coupling between adjacent cobalt(II) ions.