Electron paramagnetic resonance study of radical formation from cyclopentene and dimethylacetylene following adsorption onto H-mordenite
作者:Christopher J. Rhodes
DOI:10.1039/ft9918703179
日期:——
Following adsorption of cyclopentene onto H-mordenite at low temperatures an EPR spectrum was recorded at 77 K which can be unequivocally assigned to the radical cation of 1,2,3,4,5,6,7,8-octahydronaphthalene (9-octalin), since it is identical with the spectrum recorded from an authentic sample of 9-octalin following γ-irradiation in a CFCl3 matrix. This radical shows an interesting dynamic behaviour
在低温下将环戊烯吸附到H-丝光沸石上后,在77 K处记录到EPR光谱,该光谱可以明确地分配给1,2,3,4,5,6,7,8-八氢萘的自由基阳离子(9-八氢萘),因为它与在CFCl 3矩阵中进行γ辐照后从真实的9-八氢萘样品中记录的光谱相同。根据两个环的协调反转,该自由基显示出有趣的动力学行为,该反转调节了伪轴和伪赤道耦合。在195 K初始吸附时,与该过程相关的活化能为14.4 kJ mol –1(实际上比通过ODMR在溶液中测得的活化能低),但令人惊讶地增加到28.3 kJ mol –1 将样品加热至295K。这是根据位于不同吸附位点的自由基来解释的。