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Eaton, Samuel W; Shoer, Leah E; Karlen, Steven D; Dyar, Scott M; Margulies, Eric A; Veldkamp, Brad S; Ramanan, Charusheela; Hartzler, Daniel A; Savikhin, Sergei; Marks, Tobin J; Wasielewski, Michael R
Journal of the American Chemical Society, 10/2013, Volume: 135, Issue: 39Journal Article
The crystal structure of N,N-bis(n-octyl)-2,5,8,11-tetraphenylperylene-3,4:9,10-bis(dicarboximide), 1, obtained by X-ray diffraction reveals that 1 has a nearly planar perylene core and π–π stacks at a 3.5 Å interplanar distance in well-separated slip-stacked columns. Theory predicts that slip-stacked, π–π-stacked structures should enhance interchromophore electronic coupling and thus favor singlet exciton fission. Photoexcitation of vapor-deposited polycrystalline 188 nm thick films of 1 results in a 140 ± 20% yield of triplet excitons (3* 1) in τSF = 180 ± 10 ps. These results illustrate a design strategy for producing perylenediimide and related rylene derivatives that have the optimized interchromophore electronic interactions which promote high-yield singlet exciton fission for potentially enhancing organic solar cell performance and charge separation in systems for artificial photosynthesis.
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