Unique properties of C,C′-linked nido-biscarborane tetraanions. Synthesis, structure and bonding of ruthenium monocarbollide via unprecedented cage carbon extrusion

An unprecedented bisruthenacarborane (RuCB₁₀) bearing a novel 6π-electron carboranyl ligand [C₂B₁₀]²⁻has been isolated and structurally characterized from the reaction of a C,C′-linkednido-biscarborane tetraanion with {Ru(p-cymene)}²⁺.