Logical methods for preparing small metal clusters with heteronuclear metal-metal bonds can be devised by appreciating the isolobal relationships that exist between certain metal ligand combinations and organic fragments. Thus the group W(CO)
2
(r|-C
5
H
5
) has frontier orbitals of similar pattern to those of CH, while those of Rh(CO) (r|-C
5
Me
5
) and CH
2
are also similar. This paper shows how such ideas have been employed to generate compounds with bonds between rhodium and other metals.
