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A time-resolved EPR study of the triplet states of 4-phenylpyridine and its protonated cation and of biphenyl

✍ Scribed by Mikio Yagi; Isami Itoh; Akinori Komura; Kazuyoshi Hayashi; Jiro Higuchi

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 330 KB
Volume: 211
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)85182-n

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✦ Synopsis

Time-resolved EPR spectra have been observed for the lowest triplet states of biphenyl, 4-phenylpyridine (PPY) and Cphenylpyridinium (PPYH+ ) in ethanol at 77 K The sublevel preferentially populated by intersystem crossing is T, (top sublevel) in biphenyl. Following the protonation of PPY, (P,,) /( P,) changes from 9 in PPY to 1 in PPYH+ (Pi are relative populating rates; they and z axes are parallel to the in-plane short and long axes, respectively).

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