The reaction of Pt(IPr)(SnBu 3 t )(H), 1 [IPr = N-heterocylic carbene ligand N,N 0 -bis-(2,6-(diisopropyl) phenyl)imidazol-2-ylidene] with Ru 5 (l 5 -C)(CO) 15 , 2, in 1.2:1 (and 2.2:1) ratio in benzene solvent at refluxing temperature afforded the octahedral monoplatinum-pentaruthenium cluster complexes PtRu 5 (IPr)(CO) 15 (l 6 -C), 3 in 54 % (10 %) yield, PtRu 5 (IPr)(CO) 14 (H) 2 (l 6 -C), 4 in 6 % (10 %) yield and the diplatinum-pentaruthenium cluster complex Pt 2 Ru 5 (IPr) 2 (CO) 15 (l 6 -C), 5 in 2 % (36 %)yield. Complex 3 readily reacts with H 2 at room temperature to give complex 4. Compound 5 exhibits dynamical activity in solution where the two Pt(IPr) groups are exchanging rapidly. All three compounds were structurally characterized by single-crystal X-ray diffraction analyses.

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