106972-26-3Relevant articles and documents
Chemistry of Di- and Tri-metal Complexes with Bridging Carbene or Carbyne Ligands. Part 46. Synthesis of Heteronuclear Trimetal Compounds from the Dimetallic Compounds CC6H4Me-4)(CO)9> (M = Cr, Mo, or W) and CC6H4Me-4)(CO)8>; X-Ray Structure of 3-CC6H4Me-4)...
Evans, David G.,Howard, Judith A. K.,Jeffery, John C.,Lewis, Diane B.,Lewis, Gregg E.,et al.
, p. 1723 - 1730 (2007/10/02)
The compounds CC6H4Me-4)(CO)9> and in diethyl ether at room temperature afford the trimetal complex 3-CC6H4Me-4)(μ-CO)(CO)11>.An X-ray diffraction study established that there are two independent molecules in the asymmetric unit and that the molecular structure consists of a μ3-CCrReFe core with the chromium and the rhenium atoms ligated by four carbonyl groups and the iron atom by three such groups.A carbonyl ligand bridges the Cr-Re vector, however, the chromium and rhenium sites are disordered (60:40) and since the molecules have pseudo-mirror planes relating the metal tetracarbonyl fragments the bridging CO group may not be symmetrically disposed.Reactions between the compounds CC6H4Me-4)(CO)9> (M = Mo or W) and afford the related cluster compounds 3-CC6H4Me-4)(μ-CO)(CO)11>, but these species were shown to be formed via the intermediacy of the complexes .The compounds CC6H4Me-4)(CO)8> and react to give the cluster complex 3-CC6H4Me-4)(μ-CO)(CO)9>, and reactions of the latter with PPh3 and with Ph2PCH2PPh2 are described.Spectroscopic data for the new complexes are reported and discussed.Analysis of the 13C- n.m.r. data for 3-CC6H4Me-4)(μ-CO)(CO)9> has shown that the aromatic ring of the tolylmethylidyne group is locked into a fixed position at -80 deg C.However, in the closely related cluster 3-CC6H4Me-4)(CO)9> the group is free to rotate about the μ3-C-C1 axis at this temperature.These results have been interpreted in the light of extended Hueckel molecular orbital calculations on the bonding of these molecules.
