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Free radical studies by resonance Raman spectroscopy: Chemically and photochemically generated 1,4‐diaminobenzene radical cation
Author(s) -
Ernstbrunner E. E.,
Girling R. B.,
Grossman W. E. L.,
Mayer E.,
Williams K. P. J.,
Hester R. E.
Publication year - 1981
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250100131
Subject(s) - raman spectroscopy , radical ion , chemistry , aqueous solution , resonance raman spectroscopy , dimer , photodissociation , photochemistry , bromine , resonance (particle physics) , spectroscopy , ion , organic chemistry , physics , particle physics , quantum mechanics , optics
The free radical cation of 1,4‐diaminobenzene ( p ‐phenylenediamine, PPD +. ) has been generated in aqueous solution, wherein it is short‐lived, by oxidation of the parent compound with bromine. The same PPD +. radical has also been produced by UV photolysis of the parent at 77 K in an ethanolic glassy matrix. Resonance Raman spectra of the radical and its parent are reported and analysed in detail with the aid of normal coordinate and molecular orbital calculations. Evidence is presented for (PPD +. ) 2 dimer formation in aqueous solution at room temperature.