AGGREGATION OF CARBAMATO LIGANDS AROUND THE [CO4O](6- SYNTHESIS AND STRUCTURE OF THE CLUSTER [CO4O(O2CNC9H18)(6)] PREPARED BY A NOVEL OXO-TRANSFER REACTION OF THE NITROXYL FREE-RADICAL 2,2,6,6-TETRAMETHYLPIPERIDIN-1-OXYL WITH [CO-2(CO)(8)]() CORE )

The novel oxo-centred tetrahedral cobalt duster [Co4O](6+) bridged by six carbamato ligands is prepared in high yield when reacting [Co-2(CO )(8)] with an excess of the nitroxyl radical 2,2,6,6-tetramethylpiperi din-1-oxyl; the molecular structure of the title compound is determine d by a single-crystal X-ray analysis.