Room temperature phosphorescence by metal-free chromophores is quite a rare phenomenon. Hexasulfurated benzene-cored molecules with phenyl substituents, hereafter named asterisks, display bright green phosphorescence in the solid state at room temperature, while they are not luminescent in solution, because of fast non-radiative decay of the lowest excited state. Some of these asterisks are also among the most phosphorescent compounds. Following a search for structure-property relationships, we report here the synthesis, characterization, crystal structure and optical properties of three pentasulfurated benzene-cored asterisks, carrying at the sixth position of the benzene core a cyano (A5CN), a carboxaldehyde (A5CHO), or a vinyl group (A5CC). The most luminescent compound is A5CN displaying an intense orange phosphorescence in the solid state: our actual aim is to try and correlate the optical properties together with the crystal structure in this series of compounds.

Pentasulfurated Benzene-Cored Asterisks: Relation Between Crystal Structure and Luminescence Properties

Villa Marco;D'agostino Simone;Sabatino Piera
;
Ceroni Paola
2020

Abstract

Room temperature phosphorescence by metal-free chromophores is quite a rare phenomenon. Hexasulfurated benzene-cored molecules with phenyl substituents, hereafter named asterisks, display bright green phosphorescence in the solid state at room temperature, while they are not luminescent in solution, because of fast non-radiative decay of the lowest excited state. Some of these asterisks are also among the most phosphorescent compounds. Following a search for structure-property relationships, we report here the synthesis, characterization, crystal structure and optical properties of three pentasulfurated benzene-cored asterisks, carrying at the sixth position of the benzene core a cyano (A5CN), a carboxaldehyde (A5CHO), or a vinyl group (A5CC). The most luminescent compound is A5CN displaying an intense orange phosphorescence in the solid state: our actual aim is to try and correlate the optical properties together with the crystal structure in this series of compounds.
2020
Villa, Marco, D'agostino, Simone, Sabatino, Piera, Noel, Raymond , Busto, Josè , Roy, Myriam , Gingras, Marc, Ceroni, Paola
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/733010
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