Spectroscopic behaviour and protolytic equilibrium of fluorescein immobilized in ethyl cellulose

Martin M F CHOI*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

11 Citations (Scopus)

Abstract

The spectroscopic behaviour and protolytic equilibria of fluorescein (FL) dianion immobilized in polymeric films of ethyl cellulose have been studied using fluorescence and electronic absorption spectroscopies. The absorption, excitation and emission peak maxima of the dianionic form of FL in a polymeric film of ethyl cellulose are red-shifted when compared with in aqueous medium. The bathochromic shift can be explained by hydrogen bonding effects between the dianionic form of FL and surrounding water molecules as the concentration of water in a hydrophobic polymeric film of ethyl cellulose is less. Only one single protolytic step is observed for neutral FL in polymeric membrane phase. The acid dissociation constant of FL in ethyl cellulose film is found to be 5.00-5.13 at 25°C.

Original languageEnglish
Pages (from-to)235-239
Number of pages5
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume114
Issue number3
DOIs
Publication statusPublished - 30 Apr 1998

Scopus Subject Areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

User-Defined Keywords

  • Ethyl cellulose
  • Fluorescein dianion
  • Protolytic equilibrium
  • Spectroscopic behaviour

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