The reaction of Ru-5(CO)(15)(mu(5)-C), 1, with Ph3GeH at 150 degreesC has yielded two new germanium-rich pentaruthenium cluster complexes: Ru-5(CO)(11)(mu-CO)(mu-GePh2)(3)(mu(5)-C), 2; Ru-5(CO)(11)(mu-GePh2)(4)(mu(5)-C), 3. Both compounds contain square pyramidal Ru-5 clusters with GePh2 groups bridging three and four of the edges of the Ru-5 square base, respectively. When treated with 1 equiv of Ph3GeH at 150 degreesC compound 2 is converted to 3. Reaction of 3 with H-2 at 150 degreesC yielded Ru-5(CO)(10)(mu-GePh2)(4)(mu(5)-C)(mu-H)(2), 4, containing two hydride ligands and one less CO ligand. Reaction of 4 with hydrogen at 150 degreesC yielded the compound Ru-5(CO)(10)(mu-Geph(2))(2)(mu(3)-GePh)(2)(mu(3)-H)(mu(4)-CH), 5, by loss of benzene and conversion of two of the bridging GePh2 groups into triply bridging GePh groups. Compound 5 contains one triply bridging hydride ligand and a quadruply bridging methylidyne ligand formed by addition of one hydrogen atom to the carbido carbon atom.