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The effect of substituents and molecular aggregation on the room temperature phosphorescence of a twisted π-system
Cristian A M Salla1, Giliandro Farias2, Ludmilla Sturm3
1Department of Physics, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil. ivan.bechtold@ufsc.br.
Abstract:
Considering the relevance of room temperature phosphorescent (RTP) materials, we discuss the influence of donor and acceptor groups substituted on to a twisted three-fold symmetric hydrocarbon homotruxene, which presents a persistent RTP, even in the absence of donor or acceptor moieties, under ambient conditions as a result of the twisted π-system. Compared to a fluorine acceptor, a donor methoxy group increases the phosphorescence decay rate in solution, while in the solid-state, molecular aggregation and packing yield a very persistent phosphorescence visible by the eye. The RTP of the intrinsically apolar homotruxene is found to be modulated by polar substituents, whose main impact on the solid-state emission is due to altered packing in the crystal.
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