High-field EPR can be successfully used to study the dynamics of guest molecules in inclusion compounds. A radical guest has been obtained by gamma-irradiation of the inclusion compound nonadecan-10-one in perhydrotriphenylene. The rotational motion of the radicals inside the host channels is fast and the relaxation effect on the X-band EPR line shapes is small. The line widths of the W-band EPR spectra (108 GHz) are significantly larger since the molecular rotation modulates the g-tensor of the radical. Analysis of the relaxation effects shows that the X-band and W-band EPR are complementary. The former gives the maximum information at low temperature, while the latter is useful at higher temperatures.
High Field EPR of irradiated inclusion compounds
BRUSTOLON, MARINA ROSA;MANIERO, ANNA LISA
1999
Abstract
High-field EPR can be successfully used to study the dynamics of guest molecules in inclusion compounds. A radical guest has been obtained by gamma-irradiation of the inclusion compound nonadecan-10-one in perhydrotriphenylene. The rotational motion of the radicals inside the host channels is fast and the relaxation effect on the X-band EPR line shapes is small. The line widths of the W-band EPR spectra (108 GHz) are significantly larger since the molecular rotation modulates the g-tensor of the radical. Analysis of the relaxation effects shows that the X-band and W-band EPR are complementary. The former gives the maximum information at low temperature, while the latter is useful at higher temperatures.
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