Accession Number : AD0769138

Title :   The Pulse Radiolysis of Dimethysulfoxide and Binary Mixtures with Water,


Personal Author(s) : Cooper,T. K. ; Walker,D. C. ; Gillis,H. A. ; Klassen,N. V.

Report Date : 07 DEC 1972

Pagination or Media Count : 13

Abstract : The simultaneous interaction of solvated electrons with strongly solvating water molecules and weakly solvating dimethylsulfoxide (DMSO) Molecules, has been studied by pulse radiolysis. In all DMSO/H2O mixtures investigated the solvated electrons have a single absorption band with a maximum intermediate between that of pure DMSO (lambda>1500nm) and that of water (lambda max=720nm). There is nearly linear relationship between the photon energy of lambda max and the bulk dielectric constant, indicating that the optical properties of solvated electrons in the mixtures are not dominated by the water. A minimum is observed in the variation of G(epsion(max)) with DMSO/H2O composition which may be associated with intermolecular structure. In mixtures containing >0.2 mole fraction DMSO the solvated electrons have half-lives of 11-18 ns. Pure DMSO gives a free-ion yield in the range 1.2 to 1.8, as determined separately for the oxidizing and reducing species by bromide and anthracene scavenging experiments respectively. This free-ion yields is in keeping with the dielectric constant of DMSO of 46. (Modified author abstract)

Descriptors :   (*Sulfoxides, *Radiolysis), Infrared spectra, Canada, Solutions(Mixtures), Solvates, Electrons, Water

Subject Categories : Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE