Photoreactivity of bis(tricyclohexylphosphine)benzylidene ruthenium dichlorode (Grubbs's catalyst)

摘要

The carbene complex Ru~(II)(CHPh)(PCy_3)_2Cl_2 (Cy = cyclohexyl) in benzene undergoes a photochemical release of a phosphine ligand with #phi# = 2.5 X 10~(-3) at #lambda#_(irr) = 546 nm. The reactive excited state is assumed t be a ligand field triplet. It is suggested that the photodissociation is initiated by a distortion of the complex from a square-planar towards a trigonal-bipyramidal structure.