Time-resolved EPR and Fourier transform EPR study of triplet C[sub 60]. Determinations of T[sub 1] and the [sup 13]C hyperfine coupling constant

Journal Article · Thu Jun 03 04:00:00 EDT 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100124a018· OSTI ID:6233929

Zhang, D ^[1]; Norris, J R ^[2]; Krusic, P J; Wasserman, E ^[3]; Chen, C C; Lieber, C M ^[4]

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1. Univ. of Chicago, IL (United States)
2. Univ. of Chicago, IL (United States) Argonne National Lab., IL (United States)
3. E.I. du Pont de Nemours Co., Wilmington, DE (United States)
4. Harvard Univ., Cambridge, MA (United States)

Continuous wave (CW) and time-resolved (TR) EPR spectra of triplet C[sub 60] with partial and full [sup 13]C enrichment in methylcyclohexane solutions after UV irradiation were obtained. Line broadening from [sup 13]C satellites was observed. The [sup 13]C hyperfine coupling constant was determined to be 0.06 G. Fourier transform EPR (FT-EPR) experiments with a resolution of 20 ns were carried out, and T[sub 1] was found to be 0.8 [+-] 0.1 [mu]s by fitting the intensity of the free induction decay signal to the modified Bloch equations. The relaxation time from FT-EPR is in excellent agreement with estimations from the line width of CW-EPR. Because the [sup 13]C hyperfine coupling constant is so small, no distinct satellite line were observed with [sup 13]C in natural abundance at 200 K. 32 refs., 4 figs.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6233929
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:22; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

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