Constitution and HPLC Resolution of Enantiomers of the [8,4'-μ-R2N-commo-(1,2-C2B9H10)2-3-Co] Complexthe Third Isomer of Nitrogen-Bridged Bis

Abstract

A fully asymmetric structure of the [4,8'-μ-R₂N-commo-(1,2-C₂B₉H₁₀)₂-3-Co] (R = H and Me) cobaltacarborane complexes with a monoatomic nitrogen bridge between both ligands was determined by high resolution mass spectrometry and ¹H, ¹¹B NMR, [¹¹B-¹¹B] COSY NMR spectroscopy. Their structures have been also supported by the resolution of both compounds into enantiomers on the β-cyclodextrin HPLC column. A complex reaction of the [3-Co-commo-(1,2-C₂B₉H₁₁)₂]^- ion with the NO⁺ cation is briefly discussed and the tentative structure of the second main product is also suggested.