FLASH PHOTOLYSIS STUDY OF THE REACTIONS BETWEEN PHOTOEXCITED FLUORESCEIN (AND SIMILAR DYES) AND SELECTED SUBSTRATES WHICH ARE ON THE ONE HAND ELECTRON DONORS AND ON THE OTHER HAND ELECTRON ACCEPTORS

Abstract

Primary processes occurring in the photo-oxidation and photoreduction of xanthene and acridine dyes in aqueous solutions were studied by means of the flash photolysis technique. Intermediary products were characterized. The triplet state of fluorescein, appearing in the photolysis of the dye in deoxygenated H2SO4 was studied with respect to absorption pectrum and decay rate. Photo oxidation of fluorescein by oxygen was studied in acidic as well as in alkaline solution. Photo oxidation of fluorescein by iron(III) was studied in 0.1 to 10 M H2SO4. Dye photo-sensitized reduction-oxidation reaction between iron(III) and ethylenediamine tetraacetic is reported. The semioxidized form of fluorescein appeared in the photo-oxidation of fluorescein by duroquinone as well as in the preceeding reaction. Influence of the carboxyl group of fluorescein on the photo chemical activity of the dye and the photoactivity of xanthene dyes were investigated.

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Document Details

Document Type
Technical Report
Publication Date
Jan 31, 1963
Accession Number
AD0409871

Entities

People

  • Stig Claesson

Organizations

  • Uppsala University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption
  • Absorption Spectra
  • Aqueous Solutions
  • Chemical Reactants
  • Chemical Reaction Properties
  • Chemical Reactions
  • Chemical Synthesis
  • Chemistry
  • Excitation
  • Flashes
  • Light Sources
  • Measurement
  • Metastable State
  • Photochemical Reactions
  • Photolysis
  • Physical Chemistry
  • Spectra

Fields of Study

  • Chemistry

Readers

  • Chemistry (specifically Chemical Fluorescence)
  • Organic Chemistry

Technology Areas

  • Microelectronics