Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Tetranuclear metal compounds with rhenium-molybdenum or -tungsten bonds. Crystal structures of {Mo2Re2(μ3-CC6H4Me-4)2(μ-CO)2(CO)7(η-C5H5)2}·1.5CH2Cl2 an - Jeffery, John C.; Parrott, Michael J.; Pyell, Ute (Journal of the Chemical Society, Dalton Transactions, 1988)