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Ruthenacarborane complexes of formula [3-H-3,3-(PPh₃)₂-8-L-closo-3,1,2-RuC₂B₉H₁₀)] (L = SMe₂ (2a), SEt₂ (2b), S(CH₂)₄ (2c), SEtPh (2d)) and [1-Me-3-H-3,3-(PPh₃)₂-8-L-closo-3,1,2-RuC₂B₉H₉)] (L = SMe₂ (2e), SEt₂ (2f)) were prepared by reaction of the respective monoanionic charge-compensated ligands [10-L-nido-7,8-C₂B₉H₁₀]^- and [7-Me-10-L-nido-7,8-C₂B₉H₉]^- with [RuCl₂(PPh₃)₃]. Similary, complexes [3-H-3,3,8-(PPh₃)₃-closo-3,1,2-RuC₂B₉H₁₀)] (4a) and [3-H-3,3-(PPh₃)₂-8-PPh₂Me-closo-3,1,2-RuC₂B₉H₁₀)] (4b) were prepared from the corresponding phosphonium ligands. The reaction is done in one pot by reacting the ligand with the Ru(II) complex in a 1.5:1 ratio. All compounds have been fully characterized by multinuclear NMR spectroscopy, and the molecular structures for 2a and 4a have been elucidated by single-crystal X-ray diffraction analysis. The Ru(II) atom in this complex is on the …