Time-resolved resonance Raman spectroscopy of p-aminophenol radical cation in aqueous solution

Journal Article · Thu Aug 09 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100379a023· OSTI ID:6423280

Sun, Q; Tripathi, G N.R.; Schuler, R H ^[1]

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1. Univ. of Notre Dame, IN (USA)

Examination of the intermediates associated with the 410-450-nm absorption in the pulse radiolytic oxidation of aqueous p-aminophenol by time-resolved resonance Raman spectroscopy shows that below pH 2 the transient species responsible is the p-aminophenol radical cation. Strongly resonance enhanced in the Raman spectrum of the radical cation are the {nu}{sub 8a} phenyl ring stretching vibration at 1,631 cm{sup {minus}1} and the {nu}{sub 9a} CH bending vibration at 1,178 cm{sup {minus}1}. The phenyl modes {nu}{sub 7a} and {nu}{sub 13}, which involve significant contributions from the CN and CO stretching motions, are observed prominently at 1516 and 1406 cm{sup {minus}1}. In basic solutions this absorption spectrum, which is shifted slightly to the red, is ascribed to the p-aminophenoxyl radical. In the neutral radical the CN and CO stretching motions are strongly coupled, and only one intense band representing the in-phase vibration is observed at 1,434 cm{sup {minus}1}.

• OSTI ID: 6423280
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:16; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
AQUEOUS SOLUTIONS
AROMATICS
CATIONS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
DISPERSIONS
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
IONS
LASER SPECTROSCOPY
MEASURING METHODS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
PH VALUE
PHENOLS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
RAMAN SPECTROSCOPY
REACTION INTERMEDIATES
SOLUTIONS
SPECTROSCOPY