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Article

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

Photochemical and Photobiological Sciences. 2017. Vol. 16. No. 2. P. 220-227.
Glebov E. M., Pozdnyakov I. P., Matveeva S. G., Melnikov A. A., Chekalin S. V., Rogozina M. V., Yudanov V. V., Grivin V. P., Plyusnin V. F.

The photoaquation of the (OsCl62-)-Cl-IV complex was studied by means of stationary photolysis, nanosecond laser flash photolysis and ultrafast kinetic spectroscopy. The (OsCl5)-Cl-IV(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.