Photocyclization of Iminyl Radicals: Theoretical Study and Photochemical Aspects
作者:Rafael Alonso、Pedro J. Campos、Miguel A. Rodríguez、Diego Sampedro
DOI:10.1021/jo7025542
日期:2008.3.1
iminyl radicals are able to cyclize to the five- or six-membered ring, depending on the presence of a phenyl group as a spacer, a process that has been verified experimentally. The photochemical aspects of the more common five-membered ring formation, such as excited-state quenching, quantum yield, excited-state sensitizers, laser flash photolysis experiments, Stern−Volmer plot, and luminescence measurements
通过理论方法研究了酰基肟的辐照。CASPT2 / 6-31G * // CASSCF / 6-31G *计算使用11个轨道中的14个电子的有效空间表示S 2应当处于光谱状态,并且由于亚胺π*和σ* N-O轨道之间的耦合,其弛豫直接导致N-O键断裂。随后在B3PW91 / 6-31 + G *水平进行的计算表明,取决于苯基作为间隔基的存在,所得的亚氨基自由基能够环化为五元或六元环。经过实验验证。研究了更常见的五元环形成的光化学方面,例如激发态猝灭,量子产率,激发态敏化剂,激光闪光光解实验,斯特恩-沃尔默图和发光测量。这些研究表明,单重态和三重态激发态经历相同的反应。发射寿命约为 化合物11的τ= 10.6μs 提示三联体亲子关系,而未检测到荧光,与计算出的MEP能量谱一致。