
%0 Journal Article
%A Nishimura, N 
%A Takeda, K 
%A Furumatsu, Y 
%T E.S.R. and Kinetic Studies on Radicals Produced by Photolysis of Bis(1-methylethyl)diazenes (Azoisopropanes)
%J Australian Journal of Chemistry
%D 1989/06/01
%V 42
%N 6
%P 823-835
%K 
%R https://doi.org/10.1071/CH9890823
%U https://www.publish.csiro.au/paper/CH9890823 
%X Radicals generated by photolysis of bis(1-methylethyl) diazenes (azoisopropanes) Me2C(X)-N=N-C(X)Me2, where X = -CN, -SCN, -SPh and -OAc, have been studied by means of spin trapping and radical scavenger techniques. The primarily photoproduced radicals of the type C(X)Me2 were trapped by N-t-butyl-a- phenylnitrone, except for X = -SCN. In this case, thiocyanatyl radicals were trapped by N-t-butyl-a- phenylnitrone . Radicals generated by thermoiysis were all of the type 'C(X)Me2. The diffusive separation process of a pair of photoproduced geminate radicals was investigated spectrophotometrically by following the disappearance of 2,4,6-triphenyl-3,4-dihydro-1,2,4,5-tetrazin-12H)-yl ( verdazyl ), in binary solvent systems of different viscosities. The reciprocal of the apparent zero-order rate constant with respect to verdazyl was found to be linearly related to the viscosity. This first-power relationship is briefly considered. 
