Carbon wires with metal-carbon multiple bonding

Our recent contributions to this very active field have focused on two features that differ from the vast majority of other studies (i) The construction of bimetallic species separated by odd-numbered carbon chains (LnMCMLn, LnMC3MLn etc), a situation that requires that at least one of the metal-carbon linkages involves M–C multiple bonding; (ii) the construction of bimetallic species separated by even-numbered carbon chains where both metal–carbon linkages involve metal-carbon multiple bonding. Recent examples of the former include the synthesis of tricarbido complexes of tungsten and the metals ruthenium, rhodium, iridium, gold platinum and mercury, e.g. as shown (d) for the complex Pt[C3W(CO)2{HB(pzMe2)3}]2(PPh3)2 (pz = pyrazol-1-yl). Examples of the latter are provided by (e) the first structurally characterized dimetallahexatriyne [MoW(μ-C3)(CO)2{HB(pz)3}{HB(pzMe2)3}] and (g) the first dimetallaoctatetrayne (polycarbon linkages are shown in orange).