Premium
EPR INVESTIGATIONS CONCERNING THE STRUCTURE OF THE ASCORBIC ACID RADICAL IN WATER, ALCOHOL, AND DIMETHYLSULFOXIDE
Author(s) -
Steenken S.,
Olbrich G.
Publication year - 1973
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1973.tb06391.x
Subject(s) - ascorbic acid , chemistry , electron paramagnetic resonance , radical , alcohol , methanol , intramolecular force , photochemistry , solvent , ethanol , organic chemistry , nuclear magnetic resonance , physics , food science
— Electron paramagnetic resonance (EPR) spectra of the ascorbic acid radical in water, methanol, ethanol, n ‐propanol, and dimethylsulfoxide are reported. The radical was produced by photolyzing ascorbic acid solutions containing acetone. Lines from 13 C in natural abundance are observed. Four different 13 C‐coupling constants can be distinguished. A comparison of the experimental 1 H‐coupling constants with values calculated by the INDO method allows assignment to specific protons in the radical. An effect of solvent on the spectrum is observed and is interpreted in terms of intramolecular hydrogen bonding. Data are presented which indicate that ascorbic acid is able to scavenge alcohol radicals by H‐atom transfer.