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Preparation of Macroporous Epitaxial Quartz Films on Silicon by Chemical Solution Deposition
Published on: December 21, 2015
From solution to thin films: unravelling excited-state behaviour in halogenated diradicaloids
Matteo Bevilacqua1, Luca Ciuffarin2, Roberto Costantini2,3
1Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via F. Marzolo 1, Padova, 35131, Italy. marco.baron@unipd.it.
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Stable fluorine and chlorine decorated Thiele-like diradicaloids were synthesized and studied in solution and in thin films. Femtosecond transient absorption measurements showed, for both molecules, charge-separated states in solution, but only short-lived singlets in thin films, with no evidence of twisted or charge-separated intermediates. This suppression of excited-state dynamics reflects the strong intermolecular interactions in the solid state and limits their singlet fission potential, highlighting key design challenges for implementing diradicaloids in solid-state optoelectronic and photovoltaic devices.
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