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Bond polarizability anisotropy: Resolution of the sign ambiguity
Author(s) -
Armstrong Robert S.,
Aroney Manuel J.,
Clark Robin J. H.
Publication year - 1987
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.1250180215
Subject(s) - polarizability , halogen , anisotropy , raman spectroscopy , chemistry , sign (mathematics) , birefringence , valence (chemistry) , molecular physics , crystallography , computational chemistry , molecule , physics , optics , mathematics , organic chemistry , mathematical analysis , alkyl
Abstract An internally consistent “valence–optical” scheme of additive bond and group polarizabilities, obtained from analysis of electric birefringence, refractivity and Raman intensity data, is shown to apply to a series of compounds of Group IVB elements. For all M‐halogen bonds considered (M = Si, Ge or Sn; halogen = C1, Br or I), only the positive option for ±γ, the bond anisotropy from Raman intensities, is compatible with the scheme. The negative alternatives for γ lead to results which are anomalous and in some instances not physically meaningful. This procedure permits a definitive resolution of the problem of the sign ambiguity in ±γ M‐halogen .