Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy p. 207 - 212 (1980)
Update date:2022-07-29
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Okafor, E. Chukwuemeka
The electronic absorption spectra of benzaldazine, o-, m-, and p-hydroxybenzaldazines have been separately examined in various solvents (20 solvents and solvent mixtures).The observed three groups of bands designated as α (200-225 nm), β (289-307 nm) and γ (352-375 nm) are attributed to ?* <-- ? transitions although experimental evidence based on spectra obtained in concentrated sulphuric acid reveals that ?* <-- ?(n) transitions constitute part of the γ-band.On the basis of group theoretic analysis, in the singlet manifold, all ?* <-- ?(n) transitions (i.e. IAu <-- 1IAg) are out-of-plane (Ξ) polarized while all ?* <-- ? transitions (i.e. IBu <-- 1IAg) are in plane (x,y) polarized.In the rationalization of data, the theory of resonance has been employed where deemed useful.The shifts of bands with solvents have been traced.
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