Increasing the Heavy Atom Effect of Xenon by Adsorption to Zeolites: Photolysis of 2,3-Diazabicyclo[2.2.2]oct-2-ene
作者:Mark A. Anderson、Charles B. Grissom
DOI:10.1021/ja961546h
日期:1996.1.1
The distribution of products in the photolysis of 2,3-diazabicyclo[2.2.2]oct-2-ene (DBO) is determined by the electronic spin state of the cyclohexane-1,4-diyl intermediate. Triplet cyclohexane-1,4-diyl yields 1,5-hexadiene (HD) while singlet cyclohexane-1,4-diyl produces bicyclo[2.2.0]hexane (BCH) as the stable product. Intersystem crossing (ISC) between the two diyls is enhanced by an external heavy
2,3-二氮杂双环[2.2.2]oct-2-ene (DBO) 光解产物的分布由环己烷-1,4-二基中间体的电子自旋态决定。三重环己烷-1,4-二基生成 1,5-己二烯 (HD),而单重环己烷-1,4-二基生成双环 [2.2.0] 己烷 (BCH) 作为稳定产物。外部重原子效应增强了两个二基之间的系统间交叉 (ISC)。DBO 在含有吸附氙的 NaY 沸石中的直接光解 (366 nm) 产生 75:25 的产物比,有利于三重产物 HD。这是在正辛烷中直接光解的三线态产物增加了 24%。ISC 的显着增强可能是由于八面沸石笼中 Xe 原子的极化引起的,从而使其作为重原子干扰物发挥其全部潜力。3: