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Studies on the Solvent Effect and Assignment of Bands of the Absorption Spectra of some Phenol Betaines. Part I

Authors: J. P. Saxena; B. K. Tak; T. N. Agrawal;

Studies on the Solvent Effect and Assignment of Bands of the Absorption Spectra of some Phenol Betaines. Part I

Abstract

Absorption spectra of N-methyl-2-(p-hydroxy phenyl) quinolinium hydroxide anhydro-salt has been studied in different solvents in the region 200-600 mμ. Four bands at 20830, 27400, 32470, and 42020 cm-1 have been observed in its ethanolic solution. A marked relation between the absorption spectra and hydrogen bonding capacity of the solvent has been observed in the case of the anhydro-salt characteristic absorption band in the region of longer wave-lengths. Based on available evidences, the band at 20830 cm-1 has been assigned to an intra-molecular charge-transfer band. Bands at 27400, 32470 and 42020 cm-1 have been assigned to 1Lb→1A, 1La →1A and 1Bb → 1A transitions respectively.

Keywords

Absorption Spectra, Solvent Effect, Phenol Betaines

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