In chemistry, a metal carbonyl cluster is a compound that contains two or more metal atoms linked in part by metal–metal bonds and containing carbon monoxide (CO) as the exclusive or predominant ligand. The area is a subfield of metal carbonyl chemistry, and many metal carbonyl clusters are in fact prepared from simple metal carbonyls. Simple examples include Fe(CO), Fe(CO), and Mn(CO). High nuclearity clusters include [Rh(CO)H] and the stacked Pt triangules [Pt(CO)] (n = 2–6).