Study for luminescence performance of three methyl xanthine derivatives

Spectrochim Acta A Mol Biomol Spectrosc. 2005 Sep;61(11-12):2584-9. doi: 10.1016/j.saa.2004.09.024. Epub 2004 Nov 19.

Abstract

In this paper, the low-temperature phosphorescence (LTP), the low-temperature fluorescence (LTF), the paper substrate room-temperature phosphorescence (PS-RTP) and the room fluorescence (RTF) properties of caffeine (CF), theophylline (TP), and theobromine (TB) are investigated and compared, and some rules are found out: their maximal excitation wavelength and emission wavelength are in the range of 270-300 nm and 395-445 nm, respectively. And the PS-RTP characters of lifetime, polarization and quanta yield are also investigated and compared. It is found that their lifetimes of PS-RTP are all in the level of 0.1s. They belong to long-life phosphorescence and their PS-RTP spectra are incompletely polarized.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Caffeine / chemistry
  • Fluorescence
  • Hydrogen-Ion Concentration
  • Luminescent Measurements
  • Molecular Structure
  • Spectrometry, Fluorescence
  • Temperature
  • Theobromine / chemistry
  • Theophylline / chemistry
  • Xanthines / chemistry*

Substances

  • Xanthines
  • methylxanthine
  • Caffeine
  • Theophylline
  • Theobromine