Three new compounds, Ru-4(mu(4)-GePh)(2)(mu-GePh2)(2)(mu-CO)(2)(CO)(8) (11), Ru-4(mu(4)-GePh)(2)(mu-GePh2)(3)(mu-CO)(CO)(8) ( 12), and Ru-4(mu(4)-GePh)(2)(mu-GePh2)(4)(CO)(8) ( 13), were obtained from the reaction of H4Ru4(CO)(12) with excess Ph3GeH in octane ( 11 and 12) or decane ( 13) reflux. Compound 11 was converted to compound 13 by reaction with Ph3GeH by heating solutions in nonane solvent to reflux. Compounds 11 - 13 each contain a square-type arrangement of four Ru atoms capped on each side by a quadruply bridging GePh ligand to form an octahedral geometry for the Ru4Ge2 group. Compound 11 also contains two edge-bridging GePh2 groups on opposite sides of the cluster and two bridging carbonyl ligands. Compound 12 contains three edge-bridging GePh2 groups and one bridging carbonyl ligand. Compound 13 contains four bridging GePh2 groups, one on each edge of the Ru-4 square. The reaction of H4Os4(CO)(12) with excess Ph3GeH in decane at reflux yielded two new tetraosmium cluster complexes, Os-4(mu(4)-GePh) (2)(mu-GePh2)(3)(mu-CO)(CO)(8) ( 14) and Os-4(mu(4)-GePh)(2)(mu-GePh2)(4)(CO)(8) (15). These compounds are structurally similar to compounds 12 and 13, respectively.