The interpretation of optically detected endor in zero field and their relationship to 14N nuclear quadrupole interactions in 3 (ππ ) states of quinoline and quinoxaline

It is shown that the proper assignment of 14N ENDOR transitions in azaaromatic π,π * triplet states must take into consideration the contribution of the electron magnetic moment operator to the intensity of a given transition. In quinoline and quinoxaline, the electron magnetic moment operator is fo...

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Bibliographic Details
Published in:Chemical physics letters 1970-02, Vol.4 (10), p.591-595
Main Authors: Buckley, M.J., Harris, C.B., Maki, A.H.
Format: Article
Language:English
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Summary:It is shown that the proper assignment of 14N ENDOR transitions in azaaromatic π,π * triplet states must take into consideration the contribution of the electron magnetic moment operator to the intensity of a given transition. In quinoline and quinoxaline, the electron magnetic moment operator is found to give the dominant contribution to ENDOR intensities, and to a high degree of accuracy the nuclear moment operator may be neglected. An erroneous ENDOR assignment of quinoxaline is corrected on this basis, and the ENDOR of quinoline is assigned. In particular, we find for these molecules that the dominant ENDOR transitions do not yield the 14N qudrupole parameters e 2 qQ and η independently, but only the value of 3 e 2 qQ (1-η/3)/4.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(70)80092-6