Persistent Room‐Temperature Radicals from Anionic Naphthalimides: Spin Pairing and Supramolecular Chemistry
作者:Wenhuan Huang、Biao Chen、Guoqing Zhang
DOI:10.1002/chem.201902882
日期:2019.9.25
when the N-substitution is a sufficiently strong donor and mediates an intramolecular charge-transfer (ICT) state upon photo-excitation. This work shows that, when the electron-donating ability of the N-substitution is further increased in the presence of a carbanion or phenoxide, spontaneous electron transfer (ET) occurs and results in radical anions, verified with electron-paramagnetic resonance (EPR)
N取代的萘二甲酰亚胺(NNI)已显示出从NNI定位的三重激发态起的高效且持久的室温磷光,而N取代是足够强的供体并介导分子内电荷转移(ICT)态在光激发下。这项工作表明,在碳负离子或酚盐的存在下,如果进一步提高N取代基的供电子能力,则会发生自发电子转移(ET)并产生自由基阴离子,并通过电子顺磁共振(EPR)进行了验证光谱学。但是,EPR活性阴离子出奇地持久并且在阴离子条件下不易发生亲核和自由基反应。认为稳定性源于ET后N供体和NI受体之间的分子内自旋配对,