Dérivés hydrosilylés des complexes (η-arène) tricarbonylchrome, de type (η C6R6)(CO)2Cr(H)SiHPh2; liaison à 2 électrons/3 centres, Cr—H—Si

Abstract

Diphenylsilane reacts photochemically, at low temperature, on the η(tricarbonylchromium) arenes, to give unstables hydrosilylcomplexes, (η-C6R6)(CO)2Cr(H)SiHPh2 with a three-center two-electron bond, Cr—H—Si; according to 29Si NMR data, the degree of this bond is higher than both the degree of the Mn—H—Si bond in isoelectronic manganese compounds, (η-C5R5)L2Mn(H)SiHPh2, and the degree of the three-center Cr—H—Si bond in the permethylated complex, (η-C6Me6)(CO)2Cr(H)SiHPh2, of chromium. The variation of [Formula: see text] depending on the electron density of the metal is discussed.