New types of charge-compensated metallacarboranes: Synthesis, characterization, and structural studies of [(η5-RC2B9H9CH2NMe2)Cr(μ-Cl)Cl]2 (R = H, Me)

We report for the first time the structural characterization of charge-compensated half-chromocenes 5 and 6 containing a cationic quaternary N-H unit. Because the synthesis of the dicarbollyl chromium complexes was unsuccessful with both the deprotonated dicarbollylammine ligand systems, we developed a new strategy involving the transmetallation of a dicarbollyl aluminum complex.152