Two‐Photon Photochromism of a Diarylethene Enhanced by Förster Resonance Energy Transfer from Two‐Photon Absorbing Fluorenes |
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| Authors: | Kevin D Belfield Mykhailo V Bondar Claudia C Corredor Florencio E Hernandez Olga V Przhonska Sheng Yao |
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| Affiliation: | Department of Chemistry, ollege of Optics and Photonics, CREOL and FPCE, University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816, USA. kbelfiel@mail.ucf.edu |
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| Abstract: | Resonance energy transfer from two-photon absorbing fluorene derivatives to the photochromic compound 3,4-bis-(2,4,5-trimethyl-thiophen-3-yl)furan-2,5-dione (PC 1) is investigated in hexane under one- and two-photon excitation. The quenching of the steady-state fluorescence of donor molecules in the presence of the diarylethene acceptor is used to study the nature of resonance energy transfer. The F?rster distances and critical acceptor concentrations are determined for nonbound donor-acceptor pairs in homogeneous molecular ensembles. Quite significantly, up to a two-fold enhancement in the velocity of the photochromic transformation of 1, in the presence of two-photon absorbing fluorene derivatives, is demonstrated. |
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| Keywords: | diarylethenes fluorescence FRET (Fluorescence resonance energy transfer) photochromism two‐photon excitation |
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