Issue 11, 2005

Intermediates formed by laser flash photolysis of [PtCl6]2− in aqueous solutions

Abstract

The stationary photolysis of [PtCl6]2− in aqueous solutions (10−5–10−4 M) at the region of 313 nm leads to its photoaquation with a quantum yield of 0.19. Laser flash photolysis experiments (308 nm) provided evidence of the formation of Pt(III) intermediates, namely [PtCl4(OH)(H2O)]2− and [PtCl4], and Cl2˙ radical anions. The Pt(III) complexes formed as a result of an intrasphere electron transfer from Cl ligands to the excited Pt(IV) ion. However, the main (∼90%) photolysis channel was not accompanied by the transfer of Cl atoms to the solvent bulk. The photoaquation of [PtCl6]2− results from the back electron transfer in the secondary geminate pair, [PtCl5(H2O)]2−–Cl. The relative yield of Pt(III) intermediates, recorded after the completion of all processes in the geminate pair, was less than 10% of the number of disappearing initial [PtCl6]2− complexes.

Graphical abstract: Intermediates formed by laser flash photolysis of [PtCl6]2− in aqueous solutions

Article information

Article type
Paper
Submitted
06 Jul 2005
Accepted
14 Sep 2005
First published
03 Oct 2005

Photochem. Photobiol. Sci., 2005,4, 897-902

Intermediates formed by laser flash photolysis of [PtCl6]2− in aqueous solutions

I. V. Znakovskaya, Y. A. Sosedova, E. M. Glebov, V. P. Grivin and V. F. Plyusnin, Photochem. Photobiol. Sci., 2005, 4, 897 DOI: 10.1039/B509587E

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