Investigation of the free radical stability of 2,2-diphenyl-1-picrylhydrazyl upon storage in hydrogen- and electron–donning solvents at different temperatures

Rachid Ismail, Joy H. Tannous

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Samples containing free radicals are stored at various temperatures which has large impact on the radical stability. The current work shows that lower storage temperatures enhance the stability of 2,2-diphenyl-1-picrylhydrazyl radical by preserving peak shapes. The g-factor exhibited higher stability with time as the temperature decreased. Electron-donating solvents, such as tetrahydrofuran, showed improved stability, with the analyte free radical concentration decreasing only 24 % and 8 % at refrigeration and freezing conditions, respectively, compared to 99 % at room temperatures. Hydrogen-donating solvents showed limited improvement at reduced temperatures, with tetralin displaying a 99 % decrease of spin concentration at both low temperature storage conditions.

Original languageEnglish
Article number101207
JournalCase Studies in Chemical and Environmental Engineering
Volume11
DOIs
Publication statusPublished - Jun 2025

Keywords

  • DPPH
  • Electron spin resonance
  • Free radical
  • Solvent effect
  • Storage effect
  • Temperature effect

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • General Chemical Engineering
  • Environmental Science (miscellaneous)
  • Engineering (miscellaneous)

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