Journal of Physical Chemistry p. 1921 - 1924 (1986)
Update date:2022-08-22
Topics:
Yamamoto, Yukio
Nishida, Shoichi
Ma, Xiao-Hua
Hayashi, Koichiro
Pulse radiolysis of trans-stilbene (St) in tetrahydrofuran (THF) solution was carried out in the presence of quaternary ammonium salts, such as Bu4NPF6, Bu4NI, Bu4NBPh4, CeMe3NPF6, PhMe3NPF6, and BzMe3NPF6 (Bu, butyl; Ce, cetyl; Me, methyl; Ph, phenyl; and Bz, benzyl).The absorption peak of the radical anions, St-., was shifted to shorter wavelengths in the presence of the salts.The magnitude of the shift depends on the substituent groups of the quaternary ammonium cations.It is suggested that St-. forms contact ion pairs with the quaternary ammonium cations.The decay rate of St-. decreases with increasing salt concentration and becomes steady.The rate constants for the neutralization reaction of St-. with the solvent counterions, THF(H+), have been determined in the absence and presence of Bu4NPF6; in the latter case, the reaction occurs between the ion pairs St-./Bu4N+ and THF(H+)/PF6-.The results for other aromatic compounds such as bibhenyl, anthracene, and pyrene are also presented.Comparison was made with the effect of NaBPh4.
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