Three-electron bonded σ/σ* radical cations from mixedly substituted dialkyl sulfides in aqueous solution studied by pulse radiolysis
作者:Shamim A. Chaudhri、Hari Mohan、Elke Anklam、Klaus-Dieter Asmus
DOI:10.1039/p29960000383
日期:——
The formation of several radical cations ([Ri,Rj]S ∴ S[Ri,Rj])+, ([Ri]2S ∴ S[Rj]2])+ and ([Ri,Rj]S ∴ S[Rj]2)+ with mixed alkyl substitution in aqueous solution has been investigated by means of pulse radiolysis. The following substituents were involved: Ri,j= H, methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, pentyl, hexyl, heptyl and octyl. Two methods of generation have been applied:
几个自由基阳离子([R i,R j ] S∴S [R i,R j ])+,([R i ] 2 S∴S [R j ] 2 ])+和([R i,通过脉冲辐解研究了在水溶液中具有混合烷基取代基的R j ] S∴S [R j ] 2)+。涉及以下取代基:R i,j= H,甲基,乙基,丙基,异丙基,丁基,仲丁基,叔丁基丁基,戊基,己基,庚基和辛基。已采用两种生成方法:(i)OH诱导的硫化物氧化,以及(ii)在极酸性的溶液中单电子还原相应的亚砜。2σ/1σ*三电子键合(> S∴S <)+型物质的最大光吸收范围为(Me 2 S∴SH 2)+的420 nm至([Me,Bu t ]的600 nm S∴S[Bu t ] 2)+。实际跃迁能量可通过所述取代基为从相应的λ之间的线性自由能相关的结论进行相关的电子感应最大和加权塔夫脱的感应σ*参数。对于非支链取代基,λmax(在eV中)= 1.40(σ*)w + 2