Use of a hexanuclear copper complex as a ligand transfer agent: Crystal structures of hexakis(6-methyl-2-pyridone)iron(III) nitrate and tetrakis(6-methyl-2-pyridone)bis(nitrato)cobalt(II)

Abstract

The hexanuclear copper complex [Cu 6Na(MeL) 12][NO 3]( 1) (where MeL = C 6H 6NO, the anion of 2-hydroxy-6-methylpyridine) undergoes ligand transfer reactions with solid hydrated transition metal nitrates. With iron(III) nitrate the salt [Fe(MeLH) 6][NO 3] 3 ( 2) results, while with cobalt(II) nitrate the complex [Co (MeLH) 4(NO 3) 2] ( 3) is formed. Both compounds have been characterized by X-ray crystallography, which reveals that in both cases the metals have regular octahedral coordination geometries, and that the protonated ligands are involved in either inter- or intra-molecular hydrogen bonding.