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Resonance Raman spectrum of the 4, 4′‐bipyridine radical anion
Author(s) -
Kihara Hayato,
Gondo Yasuhiko
Publication year - 1986
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.1250170306
Subject(s) - raman spectroscopy , chemistry , radical ion , photochemistry , ion , bipyridine , biphenyl , 4,4' bipyridine , tetrahydrofuran , resonance raman spectroscopy , 2,2' bipyridine , resonance (particle physics) , molecule , crystallography , crystal structure , organic chemistry , hydrogen bond , atomic physics , physics , solvent , optics
Resonance Raman, ESR and visible absorption spectra have been observed at room temperature for the 4, 4′‐bipyridine radical anion in tetrahydrofuran and for 4, 4′‐bipyridine adsorbed on metallic potassium. Based on the quinoid structure of the radical anion, as predicted by the MO theory, a normal coordinate analysis has been carried out. The relative Raman intensities have also been calculated satisfactorily for the totally symmetric modes of the radical anion. Thus, the main Raman bands are interpreted in terms of the molecular structure change caused by the resonant electronic transition in the visible region. The results are compared with those of the biphenyl radical anion, 2,2′‐bipyridine radical anion and the methylviolegen radical cation reported in the literature.