A 10-connected coordination network based on the planar tetranuclear cobalt cluster building blocks: synthesis, structure, and magnetism

A coordination polymer [Co4(μ2-H2O)2(1,4-ndc)4(dpp)2]n (1) with the 1,4-naphthalenedicarboxylic acid (1,4-H2ndc) and 1,3-di(4-pyridyl)propane (dpp) mixed ligands has been synthesized and structurally and magnetically characterized. Compound 1 features a 3D framework based on the tetranuclear [Co4(μ2-H2O)2(COO)6] secondary building units (SBUs) where the four cobalt ions are coplanar. The 3D coordination network of 1 is a rare 10-connected network of (36·434·53·62) topology based on the tetranuclear cobalt cluster nodes. Magnetic measurements on compound 1 indicate that there is a net antiferromagnetic coupling among the Co(II) ions.