Spiked triangular clusters

Reaction of the bis(diphenylphosphino)methane (dppm) complex PdPt-(yi-dppm)2Cl2 (132) with carbonylate anions affords several tri- and tetranuclear clusters. Reactions are outlined in Scheme 7. Treatment of 132 with 2 mol equivalents of [Fe(CO)3(NO)] (796,797), [Co(CO)4] (196,198), or [Mn(CO)5] (196,197) results in the tetranuclear spiked triangular clusters 133,134, or 135. Crystal structures on the dipalladium analogues of 134 and 135 have been reported (797,799). Grossel et al. (136) and Braunstein et al. (200) have independently reported that reaction of 132 with 1 mol equivalent of [Fe(CO)4]2 at ambient temperatures leads to an inseparable 1 1 mixture... 

In two studies we have investigated the transformation of the spiked triangular cluster Ru3Pt(//-H)(//4-CCBu )(CO)9(dppe) into the butterfly cluster Ru3Pt( 4-// -C=CHBu )(CO)9(dppe) (Eq. 1) and the formation of the tri-nuclear cluster complex WCo2(CO)8(//-CC6H4Me-4)Cp, from W(CO)2(C6H4Me-4)Cp and Co2(CO)8 in THE(Eq. 2). 

The so-called spiked-triangular geometry of tetranuclear clusters (or metallo-ligated clusters) is here represented by the structure of... 

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