Cobalt complexes of the chelating dicarboxylate ligand 'esp': a paddlewheel-type dimer and a heptanuclear coordination cluster

摘要

The coordination chemistry of Co(ii) with the chelating dicarboxylate ligand esp (esp = alpha alpha alpha'alpha'-tetramethyl-1,3-benzenedipropionate) is explored. We report here the bimetallic paddlewheel-type dimer, Co-2(esp)(2)(EtOH)(2) (1), and a bowl-shaped, heptanuclear coordination cluster, Co-7(OH)(4)(Hesp)(2)(esp)(4)(MeCN)(2)center dot 4MeCN (2). Crystal structures of both complexes are reported as well as their magnetic properties, which indicate antiferromagnetic interactions among the Co(ii) ions.