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Study of molecular motions and 14 N quadrupolar coupling in 1,3‐ and 1,4‐ diethylpyridinium bromides using 13 C and 14 N relaxation time measurements
Author(s) -
Ghesquière Denis,
Chachaty Claude
Publication year - 1977
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270090704
Subject(s) - relaxation (psychology) , methylene , coupling constant , chemistry , coupling (piping) , nuclear magnetic resonance , rotation (mathematics) , internal rotation , analytical chemistry (journal) , crystallography , computational chemistry , atomic physics , physics , materials science , medicinal chemistry , organic chemistry , quantum mechanics , psychology , social psychology , mechanical engineering , geometry , mathematics , engineering , metallurgy
The internal and overall motions of 1,3‐ and 1,4‐diethylpyridinium bromides have been studied by 13 C relaxation. The enthalpies of activation for the rotation of the ethyl groups in positions 1 and 3 are deduced from the temperature dependence of the T 1 values of the methylene and methine carbons. The 14 N quadrupolar relaxation time, T q , together with 13 C relaxation data provide an estimate of the 14 N quadrupolar coupling constants.