Photophysics and Photochemistry of Trifluoromethylfullerene Fluorophores

Tuesday, May 13, 2014: 15:00
Bonnet Creek Ballroom XI, Lobby Level (Hilton Orlando Bonnet Creek)
K. P. Castro (Colorado State University), Y. Jin, J. J. Rack (Ohio University), A. Ferguson, J. L. Blackburn (National Renewable Energy Laboratory), S. H. Strauss, O. V. Boltalina (Colorado State University), and A. A. Popov (IFW Dresden)
Five fluorescent trifluoromethyl fullerenes have been studied using time-resolved and steady-state spectroscopy. Prior to this study Nakamura et al. reported the highest quantum yield for a fullerene derivative of 0.24 with the molecule C60Ph10(CH2Ph)3Me2H (1). Three of the trifluoromethyl fullerenes presented exceed this, and one isomer of C70(CF3)10 has a quantum yield of 0.68 (2). The fluorescence lifetimes of three C70(CF3)10 compounds has been measured using time-resolved fluorescence spectroscopy. The compound with the highest quantum yield also has the longest fluorescence lifetime 51 ns. The ability of these compounds to sensitize the production of singlet oxygen has also been investigated.

Between isomers of C70(CF3)8 and C70(CF3)10 only one CF3 group is in a different location. This change in position results in 200 and 14-fold increases in the quantum yield. These isomers have very similar size and location of the remaining pi system; the remaining pi system had previously been hypothesized to be the determining factor for fluorescence quantum yields of C60 derivatives (1,3). Instead we propose that fluorescence quantum yields are more related to the oscillator strength and ΔS1−T1 energy gaps. These values can be predicted using time-dependent density functional theory calculations, which provides a method to target the most fluorescent fullerene derivatives.


1. T. Fujita; Y. Matsuo; and E. Nakamura, Chem. Mater., 24, 3972 (2012).

2. K. P. Castro; Y. Jin; J. J. Rack; S. H. Strauss; O. V. Boltalina; A. A. Popov, J. Phys. Chem. Lett., 4, 2500 (2013).

3. Y. Matsuo; Y. Sato; M. Hashiguchi; K. Matsuo; and E. Nakamura, Adv. Funct. Mater., 19, 2224 (2009).