Bonding Between G12 and Transition Metals

There is a large amount of G12-TM-bonded compounds, which have been prepared by different methods. Only some typical or important classes of these compounds are selected and discussed in this section. An excellent review on Zn-TM-bonded compounds has been written by Fischer et al. [54]. 

In 1976, Green et al. reported the formation of highly insoluble red-brown compounds with the composition [ Cp MZn, ] (80a, M = Mo 80b, M = W) [62]. It is proposed that these complexes contain M-Zn bonds (M = Mo, W) and form cyclic tetramers or linear polymers. 

Zn-Rh-bonded compounds ] (dippp)Rh 2( i-H)2 i-Zn(CH2Ph) 2] (115) and ] (dippp)Rh 2( i-H)2 i-ZnCp 2] (116) (dippp = l,3-bis(diisopropylphosphino)propane) were synthesized by reacting ] (dippp)Rh 2( i-H)2] with [Zn(CH2Ph)2] and [ZnCp2], respectively [81]. Tanase et al. prepared Hg-Rh-bonded tetranuclear complexes [Rh3(HgX( i-Cl)2( i-X)( i-dpmppp)(CO)2]PFg (X = C1, Br, I, dpmppp = meso-l,3-bis[(diphenylphosphinomethyl)phenylphosphino]propane). Replacement of 

Sutton et al. prepared the G12-Ir-bonded complexes [Cp (CO)2lrMCl2] (117a, M = Zn 117b, M = Cd 117c, M = Hg) by reacting [Cp Ir(CO)2] with MCl [83]. It should be mentioned that [Cp (CO)2lrCdCl2] is the first Ir-Cd-bonded complex. 

LaLinde et al. synthesized numerous Pt-Cd-bonded complexes bearing alkynyl groups [(C6F5)2(C=CPh)jPtCdL] (131), [cts-Pt(CgH5)2(C=CPh)2CdL ] (132), [Pt(C=CTol)4Cd(py)]2 (133), 

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