Synthesis and physicochemical characterization of the complex cis-[Co(acac)cyclam](ClO<inf>4</inf>)<inf>2</inf>

Abstract

A new cobalt(III) complex cis-[Co(acac)cyclam](ClO4)2 (cyclam = 1,4,8,11-tetraazacyclotetradecane, acac = 2,4-pentanedionc ion) has been synthesized and characterized by elemental analysis, IR, electronic, 1H- and 13C-NMR and mass spectroscopy. Thermal decomposition studies were also performed and the thermal stability region determined. The spectroscopic data are consistent with a folded conformation of the macrocycle around the cobalt atom, which is hexa-coordinated in a distorted octahedral arrangement. The acac ion joins symmetrically through both the oxygen atoms, the two remaining sites at the cobalt atom acting as a bidentate ligand.