Abstract
Abstract ENDOR and triple resonance (GTR) of diphenyl nitroxide (DPNO) were observed in solution; it was demonstrated that DPNO is an interesting model radical forming a three-spin system (electron and 1H- and 14N-nuclear spins). The detected 14N-ENDOR belongs to one of the smallest hyperfine cases (AN=0.9653 mT). Its optimum temperature was 210 K, higher than that of the 1H, which is due to the large anisotropic hyperfine interaction of 14N. In the 1H-ENDOR spectra the effect of cross relaxation was observed, as in the case of the 14N-ENDOR lines; their temperature variations of intensity showed two maximum regions, one due to the optimum energy relaxation in the 14N-spin system and the other due to the energy relaxation inherent in the 1H-spin system. In the triple studies new phenomena were pointed out: An enhancement saturation effect due to the large hyperfine interaction and an intensified enhancement or de-enhancement effect due to the cross relaxation.
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