三氟甲基叔丁基氮氧自由基的超精细偶合常数与溶剂极性参数的相关性研究  

EPR Study on Correlation Between aN Values of Trifluoromethyl t-Butyl Nitroxide and Solvent Parameters ET and Z(kosower)

作　　者：赵成学[1] 彭以源 曲延玲[1] 彭红[1] 

机构地区：[1]华中理工大学化学系,武汉430074

出　　处：《高等学校化学学报》1992年第11期1448-1451,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：用EPR方法测定了三氟甲基叔丁基氮氧自由基在16种溶剂中的顺磁参数αn和α_F~β值.并对αn值与溶剂的极性参数E_T、z进行了线性相关分析,讨论了这类低位阻含氟自旋探针对研究溶剂化和探针本身结构的作用.Trifluoromethyl t-Butyl nitroxide generated in the electron transfer reaction between(CF3CO2)2 and t-BuNHOCOPh was subjected to EPR study in 16 solvents with different polarities.The result shows the linear relationships as aN=(2.17×10-2 ET +11.34)×10-4 T(r=0.975)and aN=(1.20×10-2 Z+11.46)×10-4 T(r=0.976).By making use of such a fluori-nated un-bulky nitroxide as the model molecule,much information of theoretical importance about the solvation as well as the electronic structure of the nitroxide have been disclosed.

关 键 词：氮氧自由基 αN值 ЕT参数 EPR 

分 类 号：O626[理学—有机化学]