CONSTITUTION AND HPLC RESOLUTION OF ENANTIOMERS OF THE [8,4'-MU-R2N-COMMO-(1,2-C2B9H10)2-3-CO] COMPLEX - THE 3RD ISOMER OF NITROGEN-BRIDGEDBISICOSAHEDRAL COBALTACARBORANE

A fully asymmetric structure of the [4,8'-mu-R2N-commo-(1,2-C2B9H10)2- 3-Co] (R = H and Me) cobaltacarborane complexes with a monoatomic nitr ogen bridge between both ligands was determined by high resolution mas s spectrometry and H-1, B-11 NMR, [B-11-B-11] COSY NMR spectroscopy. T heir structures have been also supported by the resolution of both com pounds into enantiomers on the beta-cyclodextrin HPLC column. A comple x reaction of the 13-Co-commo-(1,2-C2B9H11)2]- ion with the NO+ cation is briefly discussed and the tentative structure of the second main p roduct is also suggested.