IR-spectral study of photoinduced tautomerization in 1,3-diphenyl-pyrazol-5-one

IR-spectral study of photoinduced tautomerization in 1,3-diphenyl-pyrazol-5-one

The UV-photoinduced prototropic isomerization of 1,3-diphenyl pyrazol-5-one (DPhP) embedded in polyvinyl chloride (PVC) film is studied by means of difference in IR spectral analysis. The initially existing CH-form in non-irradiated compound is transformed to NH-form, and a hydrochloride salt is sta...

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Veröffentlicht in:Open Chemistry 2003-12, Vol.1 (4), p.356-365
Hauptverfasser: Ivanova, Bojidarka, Tchapkanov, Atanas, Arnaudov, Michail, Petkov, Ivan
Format: Artikel
Sprache:eng
Schlagworte:
1,3-diphenyl pyrazol-5-one
IR-spectral study
Polymer film
Tautomerization
UV light irradiation
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Zusammenfassung:The UV-photoinduced prototropic isomerization of 1,3-diphenyl pyrazol-5-one (DPhP) embedded in polyvinyl chloride (PVC) film is studied by means of difference in IR spectral analysis. The initially existing CH-form in non-irradiated compound is transformed to NH-form, and a hydrochloride salt is stabilized because of the photodegradation of the PVC. An additional comparative IR spectral study of DPhP in different solutions as well as of its hydrochloride salts in solid state is also carried out.
ISSN:2391-5420
2391-5420
DOI:10.2478/BF02475222