Viscosity dependence of the denitrogenation quantum yield in azoalkane photolysis: experimental evidence for reversible formation of the diazenyl diradical.
[reaction: see text] Experimental evidence is reported for the reversible formation of the singlet diazenyl diradical ((1)DZ), photolytically generated from the structurally elaborate DBH-type azoalkane. Reversiblity of the (1)DZ formation manifests itself through the decrease of the photodenitrogenation quantum yield over a ca. 40-fold viscosity variation (from 0.5 to 19.3 cP). This viscosity behavior is interpreted in terms of frictional effects on the competitive reaction modes of the diazenyl diradical.
Adam
Waldemar
W
Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany. adam@chemie.uni-wuerzburg.de
Corley
David A
DA
Trofimov
Alexei V
AV
White
Rick C
RC