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UV‐visible and ESR spectroelectrochemical study of xylenol orange
Author(s) -
Dong Shaojun,
Song Shihua
Publication year - 1989
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140010612
Subject(s) - xylenol orange , disproportionation , electron paramagnetic resonance , chemistry , electrochemistry , hyperfine structure , photochemistry , radical , ultraviolet , redox , electrode , analytical chemistry (journal) , inorganic chemistry , materials science , nuclear magnetic resonance , organic chemistry , physics , optoelectronics , catalysis , quantum mechanics
The proposed first step in the electroreduction of xylenol orange (XO), a reversible electrode process coupled with a chemical reaction, is based on ultraviolet (UV)‐visible spectroelectrochemistry. Electrochemical excitation‐electron spin resonance (ESR) in situ measurements are used to observe the radical signal produced by the first step reduction of XO. The ESR spectra of the radical in solution at pH 4.0, 4.5, and 5.0 have the same characteristics: no observed hyperfine structure, a line width of 10.5 G, and a g value of 2.0034. The structure of the XO radical and its disproportionation reaction are elucidated.