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- W4232128694 abstract "In the present investigation the effects of solvents of varied polarities on the UV–visible spectral bands of some substituted benzylideneanilines and their o/p-hydroxy derivatives were explored. The analyses of the electronic absorption bands indicated the long wavelength π-π⁎ transition to be due to intramolecular charge transfer originating from the 4-methoxyaniline/aniline moiety as source and the CN unit as sink. The enol forms of o/p hydroxy benzylideneanilines were found to be more stable in neat solvents. The keto forms of these compounds on the other hand, predominated in some of the solvents in both acidic and basic conditions. A maximum of 84% keto form of p-hydroxybenzylideneaniline was observed in basic DMSO solutions at [NaOH] = 0.002 M. The tautomerization constants (KT's) of o/p-hydroxybenzylideneanilines at 300 K were determined. A good correlation between the relative permittivities of solvents and KT of p-hydroxybenzylideneaniline in the corresponding solvent with regression coefficient of 0.998 supported specific interactions between the solvent and the aldimines. But the occurrence of a scattering distribution of the relative permittivities of solvents with the KT's of o-hydroxybenzylideneaniline revealed no specific interaction of these molecules with the solvents. The oscillator strength of the charge transfer bands of the o-hydroxybenzylidene-4-methoxyaniline was found to be in the range 0.16–0.29 L mol− 1 cm− 2. The energy of the charge transfer band of the o-hydroxy substituted benzylideneanilines determined from experimental wavelength agreed very well with the theoretical values calculated by using Briegleb relation." @default.
- W4232128694 created "2022-05-12" @default.
- W4232128694 date "1993-08-01" @default.
- W4232128694 modified "2023-09-30" @default.
- W4232128694 title "Professor LászlóGuczl honoured with republic's order" @default.
- W4232128694 doi "https://doi.org/10.1016/0926-860x(93)85162-i" @default.
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