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Resonance Raman spectra and normal modes of vibration of 2,2′‐bipyridine anion radicals
Author(s) -
Danzer Gerald D.,
Golus Janusz A.,
Strommen Dennis P.,
Kincaid James R.
Publication year - 1990
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.1250210103
Subject(s) - raman spectroscopy , chemistry , ion , normal mode , resonance (particle physics) , radical , spectral line , vibration , molecular vibration , bipyridine , 4,4' bipyridine , molecule , nuclear magnetic resonance , crystallography , atomic physics , crystal structure , hydrogen bond , organic chemistry , physics , optics , quantum mechanics , astronomy
The resonance Raman spectra of the lithium complexes of the 2,2′‐bipyridine anion radical and five isotopically labeled analogues, including the 15 N‐labeled species, are reported. All of the fundamental modes of vibration, excluding the CH stretching and several low‐frequency modes, have been identified. Care must be taken to avoid contamination of the sample with the dianion Li 2 bpy. In order to eliminate possible misassignment of bands to traces of Li 2 bpy, the spectra of the latter species were also investigated. The assignments of the vibrational frequencies to the fundamental modes of Libpy are supported by a normal coordinate calculation and the structural implications of the vibrational frequency shifts, relative to the neutral parent, are discussed.