NMR AND EPR STUDY OF THE NITROXIDE RADICAL TEMPO INTERACTION WITH PHENOLS

Authors
SHENDEROVICH IG KECKI Z WAWER I DENISOV GS
Citation
Ig. Shenderovich et al., NMR AND EPR STUDY OF THE NITROXIDE RADICAL TEMPO INTERACTION WITH PHENOLS, Spectroscopy letters, 30(8), 1997, pp. 1515-1523
Citations number
14
Categorie Soggetti
Spectroscopy
Journal title
Spectroscopy letters → ACNP
ISSN journal
00387010
Volume
30
Issue
8
Year of publication
1997
Pages
1515 - 1523
Database
ISI
SICI code
0038-7010(1997)30:8<1515:NAESOT>2.0.ZU;2-K
Abstract
The 2,2,6,6-tetramethyl-1-piperidinyloxy free radical (TEMPO) was used as a probe to study the changes in hydrogen bonding between the pheno lic OH group and the ON group of the radical by means of NMR and EPR. C-13 NMR contact shifts induced by TEMPO were measured for five phenol s. Formation of intermolecular hydrogen bond between a phenol and TEMP O molecule causes noticeable increase of N-14 hyperfine coupling const ant in the radical and appearance of negative spin density on carbon n uclei of C-OH fragment in the phenol.