Ketyl anion pulse radiolysis

Other transient radicals such as (SCN)2 [78], carbonate radical (COj ) [79], Ag and Ag " [80], and benzophenone ketyl and anion radicals [81] have been observed from room temperature to 400°C in supercritical water. The (SCN)2 radical formation in aqueous solution has been widely taken as a standard and useful dosimeter in pulse radiolysis study [82,83], The lifetime of the (SCN)2 radical is longer than 10 psec at room temperature and becomes shorter with increasing temperature. This dosimeter is not useful anymore at elevated temperatures. The absorption spectrum of the (SCN)2 radical again shows a red shift with increasing temperature, but the degree of the shift is not significant as compared with the case of the hydrated electron. It is known that the (SCN) radical is equilibrated with SCN , and precise dynamic equilibration as a function of temperature has been analyzed to reproduce the observation [78],... 

The Use of Pulse Radiolysis to Measure the pKaS of Protonated Ketyl Anions... 

Radicals can also be generated via the fragmentation of radical anions. Single electron reduction of various alkyl or aryl halides will lead to bond cleavage, as shown in Eqs. 10.44 and 10.45. The reductions commonly occur from dissolving metals such as Na and K, sodium naphthalenide (Na Ar ), sodium benzophenone ketyl, or from pulse radiolysis (e ). 

The Use of Pulse Radiolysis to Measure the pK s of Protonated Ketyl Anions 402 Discovery of the Marcus Inverted Region 406 Using a More O Ferrall-Jencks Plot in Catalysis 410... 

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