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ESR.‐Spektrum von Diphenylpicrylhydrazyl (DPPH)
Author(s) -
Haniotis Z.,
Günthard Hs. H.
Publication year - 1968
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19680510323
Subject(s) - chemistry , coupling constant , spectral line , derivative (finance) , coupling (piping) , analytical chemistry (journal) , spectrometer , computational chemistry , nuclear magnetic resonance , quantum mechanics , organic chemistry , physics , mechanical engineering , financial economics , engineering , economics
The ESR. sprectra of DPPH in mixed organic solvents have been measured with a K ‐band superheterodyne spectrometer and self‐locking magnetometer with high precision. Approximately 150 lines have been resolved in the spectra. Both the zero and first order derivative spectra were analyzed by a line shape analysis program for determination of the coupling constants. The smallest coupling constant was found to be 377 ± 5 mG, all other coupling parameter are multiples of this constant. A set of most probable coupling constants is given. The two nitrogen coupling constants are found to be equal within experimental error, and there exist several rotational relations and several possible assignments.