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)...

DOI: 10.1039/DT9860002105

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Journal of the Chemical Society, Dalton Transactions p. 2105 - 2112 (1986)

Update date:2022-08-03

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Authors:

Delgado, Esther

Jeffery, John C.

Stone, F. Gordon A.

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Article abstract of DOI:10.1039/DT9860002105

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.

Full text of DOI:10.1039/DT9860002105

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