Spectral and Kinetic Properties of Radical Cations Derived from Oxoisoaporphines: Relevance to Electron-Transfer Processes Involving Phytoalexins
作者:Julio R. De la Fuente、Gabriel Kciuk、Christian Aliaga、Krzysztof Bobrowski
DOI:10.1021/jp502406u
日期:2014.5.29
electron-transfer reaction with TCNE or when generated in isolation in pulse radiolysis of Ar-saturated 1,2-dichloroethane. In acetone and acetonitrile they decay predominantly by first-order kinetics with the first-order rate constants ranging from 2.3 × 104 to 5.1 × 104 s–1. Formation of dimeric radical cations for all of the oxoisoaporphines studied was observed in acetonitrile solutions, and for azaoxoisoaporphines
四氰基乙烯(TCNE),具有大电子亲和力的π电子受体和六个氧代异四氢萘(2,3-dihydro-7 H -dibenzo [ de,h ] quinolin-7-一,5-甲氧基-2,3-二氢-7 H-二苯并[ de,h ]喹啉-7-一,1-氮杂苯并[ de ]蒽-7-一,5-甲氧基-1-氮杂苯并[ de ]蒽-7-one,7 H-苯并[ e ] perimidin-7-one和2-甲基-7 h-苯并[ e]] perimidin-7-一)的报道。给出了由这六个氧代异四氢卟酚衍生的自由基阳离子的光谱和动力学特征,这些自由基是通过热反应生成的,或者是在氩饱和的1,2-二氯乙烷,氧饱和的丙酮和乙腈中通过辐射分解生成的。氧代异戊二烯的自由基阳离子对氧不敏感,并且其最大特征是位于λmax = 400–410 nm的最强谱带的吸收最大值为特征,除了衍生自2,3-二氢氧代异戊二烯的自由基阳离子。对于后一