Optically Detected ESR (OD ESR) of ion-radical Pairs in coloured solutions. Observation of transient trans-azobenzene radical cation

O. N. Antzutkin, M. Lindgren, A. V. Koptyug, A. Lund

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Trans-azobenzene dissolved in different liquid hydrocarbons absorbs fluorescence arising from all acceptors previously used in Fluorescence Detected Magnetic Resonance (FDMR) and Optically Detected ESR (OD ESR) spectroscopy making optical detection impossible. In this report a new acceptor, rubrene, having sufficient quantum yield of fluorescence in the red band 550-620 nm, has been proven successful. OD ESR spectra of the radical-ion pair trans-azobenzene+/rubrene- were detected in liquid squalane (2,6,10,15,19,23-hexamethyl-tetracosane) solution in the temperature range 294-243 K. The experimental isotropic hyperfine splittings of the radical cation of trans-azobenzene (aN=1.4 mT) have been compared with those from MNDO/INDO calculations and with those of earlier work using freon matrix studies.

Original languageEnglish
Pages (from-to)77-86
Number of pages10
JournalApplied Magnetic Resonance
Volume5
Issue number1
DOIs
Publication statusPublished - Aug 1993
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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