85086-14-2Relevant academic research and scientific papers
Chemistry of Di- and Tri-metal Complexes with Bridging Carbene or Carbyne Ligands. Part 48. Reactions of the Cluster Complex with (R=Me or C6H4Me-4); Crystal Structures of 3-?:?':η2-C=CH2)(CO)7(η-C5H5)...
Delgado, Esther,Jeffery, John C.,Stone, F. Gordon A.
, p. 2105 - 2112 (1986)
In toluene at 80 deg C the compounds and react to give the ditungsten complex -(CO)4(η-C5H5)2> as the major product.In contrast, the corresponding reaction with yields a separable mixture of three cluster complexes:2-C=CH2)(CO)7(η-C5H5)2>, , and with the last formed in trace amounts.The structures of 2-C=CH2)(CO)7(η-C5H5)2> and have been established by X-ray diffraction.In the vinylidene complex an ironditungsten triangle is bridged by C=CH2 ligand in such a manner that the latter is ?-bonded to the tungsten atoms 2-co-ordinated to the iron .The iron atom is bonded by three terminal CO ligands, while the tungsten atoms are each ligated by a C5H5 and two CO groups.Three of the latter weakly semi-bridge the metal-metal bonds.The structure of the alkyne complex is based on a triangle of metal atoms .The MeC2C6H4Me-4 ligand lies on the face of the triangle with its C2 axis parallel to a Fe-W bond.The iron atom carries three CO groupes and the tungsten atoms two such groups and a C5H5 ligand.Three of the tungsten-ligated CO groups semi-bridge the three edges of the metal triangle .The n.m.r. data for the compounds are reported, and possible pathways for formation of the three cluster complexes are discussed.
