Abstract
Electron spin resonance spectra of 2,2′-, 3,3′-, and 4,4′-difluorobiphenyls (2DFBP, 3DFBP, and 4DFBP, respectively) in their phosphorescent triplet states have been studied in various matrices at 77 K. Two sets of peaks corresponding to the s-cis and s-trans conformers are observed for 2DFBP and 3DFBP. By using a stretched poly(vinyl alcohol) film as a host, the observed individual peaks are assigned. The 19F hyperfine splitting is obtained for 2DFBP and 4DFBP with a microwave magnetic field parallel to an external magnetic field (B ∥ B rf), which is different from the conventional resonance condition of B ⊥ B rf.
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