Abstract
Laser-induced optoacoustic spectroscopy has been applied to the photoinduced electron-transfer reaction between Ru(bpy)32+ and various salts of Fe(III) [Fe(ClO4)3, Fe2(SO4)3, and FeCl3]. The reaction volume changes associated with photoinduced ligand exchange derived from these measurements allowed the determination of partial molar volumes at high dilutions of several species such as FeSO4, FeSO4+, Fe(SO4)2-, Fe(OH)2+, FeCl+, FeCl2+, and FeCl2+, not attainable from other techniques. The volume change of oxidation of Ru(bpy)32+ to Ru(bpy)33+ at high dilution was also calculated.
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