New complexes of bis(1,3-dimethyl-4,5,6,7-tetrahydroindenyl)diruthenium tetracarbonyl and bis(3-methyl-1-phenyl-4,5,6,7-tetrahydroindenyl)diruthenium tetracarbonyl were prepared from the corresponding substituted tetrahydroindene and ruthenium carbonyl. The ligand systems were obtained by the reactions of methyl magnesium iodide and phenyl magnesium bromide with 3-methyl-2,3,4,5,6,7-hexahydroind-8(9)en-1-one.