Time dependent reactivity of species embedded in micelles: Lifetime distribution of photoproducedN,N,Nprime;,Nprime;hyphen;tetramethylbenzidine cation radicals in sodium dodecyl sulfate micelles

摘要

PhotoproducedN,N,Nprime;,Nprime;hyphen;tetramethylbenzidine cation radicals in sodium dodecyl sulfate micelles decay in a pseudohyphen;firsthyphen;order reaction with an apparent rate constantk(t) depending on time according tok(t)=Btagr;minus;1, whereBand agr;(0agr;le;1) are constants. At a given temperature the numerical value ofBdecreases with the storage time between preparation of the micellar solution and photoionization achieving a constant value for a storage time of a few days. The numerical value of agr; is essentially independent of the storage time and determines the distribution of cation radical lifetimes for a given value ofB.