2-Pyridyl aldoxime in cobalt carboxylate chemistry: Synthesis and characterization of trinuclear complexes

The use of 2-pyridyl aldoxime (pyCHNOH) in cobalt carboxylate chemistry has yielded compounds image and image in mixture, as well as compounds imageand image. Complexes 1–3 have been isolated from the 1:1:2 image molar ratio reactions in MeCN, whereas the 1:1:1 CoX2(X = Cl−)/pyCHNOH/PhCO2Na molar ratio reaction in MeCN afforded complex 4. Compounds 1–3 contain the cation image representing the first triangular oxo-centred CoIII cluster with pyCHNO−, whereas compound 4 displays an unusual structural motif consisting of dinuclear image and tetrahedral [CoIICl3]− units bridged by an oximato oxygen atom of the ligand.