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Peculiarities of intramolecular exchange and valence tautomerism in metal semiquinolates determined by high‐resolution NMR spectroscopy
Author(s) -
Voronov Vladimir K.,
Ushakov Igor A.,
Shmelev Vadim V.,
Sagdeev Dmitry R.
Publication year - 2012
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.3799
Subject(s) - chemistry , tautomer , intramolecular force , valence (chemistry) , nuclear magnetic resonance spectroscopy , spectroscopy , high resolution , carbon 13 nmr satellite , metal , transverse relaxation optimized spectroscopy , computational chemistry , fluorine 19 nmr , stereochemistry , organic chemistry , physics , quantum mechanics , remote sensing , geology
The 1 H NMR spectra of semiquinalate cobalt complex have been analyzed in a wide range of temperatures. It has been established that the intramolecular exchange requires the obligatory presence of a paramagnetic structure containing non‐compensated electron spin localized on the carbon atom of the ligand aromatic ring, the cobalt atom being trivalent. The presence of such a structure leads to the appearance of satellite signals in the NMR spectra because of the superfine interactions. Copyright © 2012 John Wiley & Sons, Ltd.