作者:Malgorzata Czerwinska、Adam Sikora、Piotr Szajerski、Jacek Zielonka、Jan Adamus、Andrzej Marcinek、Krzysztof Piech、Pawel Bednarek、Thomas Bally
DOI:10.1021/jo060622o
日期:2006.7.1
One-electron reduction significantly enhances the ability of anthralin, 1, to act as a hydrogen atom donor. On annealing of an MTHF glass in which the radical anion of anthralin, 1(center dot-), is generated radiolytically, this species decays mainly by loss of H-center dot to give the anthralyl anion, 2(-). On the other hand, radicals formed on radiolysis of matrices that are suitable for the generation of radical anions or cations are capable to abstract H-center dot from anthralin to give the anthralyl radical, 2(center dot). Both 2(-) and 2(center dot) are obtained simultaneously by mesolytic cleavage of the radical anion of the anthralin dimer. Contrary to general assumptions, the anthralyl radical is found to be much more reactive toward oxygen than the anion. All intermediates are characterized spectroscopically and by reference to quantum chemical calculations. Attempts to generate the radical cation of anthralin by X-irradiation of an Ar matrix containing anthralin led also to significant formation of its radical anion, i.e., anthralin acts apparently as an efficient electron trap in such experiments.