Primary photophysical and photochemical processes for hexachloroosmate(iv) in aqueous solution

Abstract

The photoaquation of the Os^IVCl₆²⁻ complex was studied by means of stationary photolysis, nanosecond laser flash photolysis and ultrafast kinetic spectroscopy. The Os^IVCl₅(OH)²⁻ complex was found to be the only reaction product. The quantum yield of photoaquation is rather low and wavelength-dependent. No impact of redox processes on photoaquation was revealed. The total characteristic lifetime of the process is about 80 ps. Three intermediates were recorded in the femto- and picosecond time domains and assigned to different Os(IV) species. The nature of intermediates and possible mechanisms of photoaquation are discussed.