title: Peculiarities of intramolecular exchange and valence tautomerism in metal semiquinolates determined by high-resolution NMR spectroscopy.
abstract: 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.
authors.affiliation: Irkutsk State Technical University, Irkutsk, Russia. voronov@istu.edu
authors.forename: Vladimir K
authors.initials: VK
authors.lastname: Voronov
authors.forename: Igor A
authors.initials: IA
authors.lastname: Ushakov
authors.forename: Vadim V
authors.initials: VV
authors.lastname: Shmelev
authors.forename: Dmitry R
authors.initials: DR
authors.lastname: Sagdeev
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D017378:Quinolinic Acid / Q000737:chemistry*; D013237:Stereoisomerism; D014050:Toluene / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; D014050:Toluene; D003035:Cobalt; D017378:Quinolinic Acid