Variation of excited-state dynamics in trifluoromethyl functionalized C60 fullerenes

Jaehong Park, Jessica J. Ramirez, Tyler T. Clikeman, Bryon W. Larson, Olga V. Boltalina, Steven H. Strauss, Gary Rumbles

Research output: Contribution to journalArticle

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Abstract

We report on electronically excited-state dynamics of three different trifluoromethyl C60 fullerenes (TMFs, C60(CF3)n: C60/4-1, C60/6-2, and C60/10-1, featuring four, six, and ten trifluoromethyl groups, respectively) using steady-state and time-resolved optical spectroscopy as well as ultrafast pump/probe transient absorption spectroscopy. C60/4-1 and C60/6-2 dissolved in toluene solvent show near-unity S1 → T1 intersystem crossing quantum yield (ΦISC), ca. 1 ns S1-state lifetimes, and microsecond-timescale T1-state lifetimes, which are typical of the fullerene class. On the other hand, C60/10-1 exhibits a dominant sub-nanosecond nonradiative S1 → S0 relaxation mechanism and negligible ΦISC, therefore decreasing the average excited-state lifetime (τavg) by about 5 orders of magnitude compared to that of C60/4-1 and C60/6-2 (τavg ≈ 17 μs and 54 μs for C60/4-1 and C60/6-2, respectively, whereas τavg ≈ 100 ps for C60/10-1). These excited-state characteristics of C60/4-1 and C60/6-2 are preserved in polymer matrix, suggesting that fullerene/polymer interactions do not modulate intrinsic photophysics of trifluoromethyl-substituted fullerenes. The contrasting excited-state study results of C60/4-1 and C60/6-2 to that of C60/10-1 infer that intrinsic optical properties and excited-state dynamics can be affected by the substitution on the fullerene.

Original languageEnglish
Pages (from-to)22937-22945
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number33
DOIs
Publication statusPublished - 2016

Fingerprint

Fullerenes
Excited states
fullerenes
excitation
life (durability)
polymers
Toluene
Quantum yield
Polymer matrix
Absorption spectroscopy
toluene
unity
Polymers
absorption spectroscopy
Substitution reactions
Optical properties
fullerene C60
Pumps
substitutes
pumps

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Park, J., Ramirez, J. J., Clikeman, T. T., Larson, B. W., Boltalina, O. V., Strauss, S. H., & Rumbles, G. (2016). Variation of excited-state dynamics in trifluoromethyl functionalized C60 fullerenes. Physical Chemistry Chemical Physics, 18(33), 22937-22945. https://doi.org/10.1039/c6cp04461a

Variation of excited-state dynamics in trifluoromethyl functionalized C60 fullerenes. / Park, Jaehong; Ramirez, Jessica J.; Clikeman, Tyler T.; Larson, Bryon W.; Boltalina, Olga V.; Strauss, Steven H.; Rumbles, Gary.

In: Physical Chemistry Chemical Physics, Vol. 18, No. 33, 2016, p. 22937-22945.

Research output: Contribution to journalArticle

Park, J, Ramirez, JJ, Clikeman, TT, Larson, BW, Boltalina, OV, Strauss, SH & Rumbles, G 2016, 'Variation of excited-state dynamics in trifluoromethyl functionalized C60 fullerenes', Physical Chemistry Chemical Physics, vol. 18, no. 33, pp. 22937-22945. https://doi.org/10.1039/c6cp04461a
Park J, Ramirez JJ, Clikeman TT, Larson BW, Boltalina OV, Strauss SH et al. Variation of excited-state dynamics in trifluoromethyl functionalized C60 fullerenes. Physical Chemistry Chemical Physics. 2016;18(33):22937-22945. https://doi.org/10.1039/c6cp04461a
Park, Jaehong ; Ramirez, Jessica J. ; Clikeman, Tyler T. ; Larson, Bryon W. ; Boltalina, Olga V. ; Strauss, Steven H. ; Rumbles, Gary. / Variation of excited-state dynamics in trifluoromethyl functionalized C60 fullerenes. In: Physical Chemistry Chemical Physics. 2016 ; Vol. 18, No. 33. pp. 22937-22945.
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