J. Phys. IV France
Volume 125, June 2005
Page(s) 11 - 13

J. Phys. IV France 125 (2005) 11-13

DOI: 10.1051/jp4:2005125003

The partial molar volumes of hydrated proton and electron determined with time-resolved photoacoustic

C.D. Borsarelli

Instituto de Ciencias Químicas. Universidad Nacional de Santiago del Estero, Av. Belgrano (S) 1912, 4200 Santiago del Estero, Argentina

Photoinduced charge-transfer reactions in solution produce the formation or destruction of ionic species. Therefore, important structural rearrangements in the solutes and their solvent spheres can be expected, with a net (positive or negative) reaction volume change, $\delta$VR, which in turn represents the difference between the individual partial molar volume, Vo, of the products and reactants. The partial molar volume is an important thermodynamic magnitude used in solution chemistry. In this presentation, the $\delta$VR information obtained with time-resolved photoacoustics (TRP) for a couple of photoinduced charge-transfer processes was used to estimate the Vo of fundamental ionic species in aqueous solutions, such as the hydrated proton and electron.

© EDP Sciences 2005