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

Autor:	R. H. Schuler, G. N. R. Tripathi, Q. Sun
Rok vydání:	1990
Předmět:	Absorption spectroscopy Chemistry Resonance Raman spectroscopy General Engineering Resonance Radiation chemistry symbols.namesake Crystallography Nuclear magnetic resonance Radical ion symbols Absorption (logic) Physical and Theoretical Chemistry Spectroscopy Raman spectroscopy
Zdroj:	The Journal of Physical Chemistry. 94:6273-6277
ISSN:	1541-5740 0022-3654
DOI:	10.1021/j100379a023
Popis:	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}.
Databáze:	OpenAIRE
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