The reaction of Ru3(CO)12 with 1-adamantanecarboxylic acid afforded a purple solid with the formulation Ru2(CO)4(μ-OOCAd)2 (Ad = 1-adamantyl). Reaction of this solid with PPh3 gave Ru4(CO)8(μ-OOCAd)4(PPh3)2, a 64-electron linear tetraruthenium cluster.

The heteronuclear cobalt-platinum cluster [Co 2 Pt 2 (IPr) 2 (µ 2-CO) 4 (CO) 4 ] can be obtained through an addition reaction in [Co 2 (CO) 8 ], and with subsequent cluster fragmentation in [Co 4 (CO) 12 ] and [Co 3 (µ 3-CH)(CO) 9 ], upon reaction with the [Pt(IPr)] fragment. The last reaction also afforded another cobaltplatinum cluster [Co 4 Pt 2 (µ 6-C)(IPr) 2 (µ 2-CO) 5 (CO) 6 ]. These are the first examples of Co-Pt heteronuclear clusters containing NHC ligands.

The high nuclearity osmium carbonyl cluster Na2[Os10(μ6-C)(CO)24] is a good near-IR photoacoustic contrast agent for full body imaging.

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