title: Two-photon photochromism of a diarylethene enhanced by Förster resonance energy transfer from two-photon absorbing fluorenes.
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 Förster 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.
authors.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
authors.forename: Kevin D
authors.initials: KD
authors.lastname: Belfield
authors.forename: Mykhailo V
authors.initials: MV
authors.lastname: Bondar
authors.forename: Claudia C
authors.initials: CC
authors.lastname: Corredor
authors.forename: Florencio E
authors.initials: FE
authors.lastname: Hernandez
authors.forename: Olga V
authors.initials: OV
authors.lastname: Przhonska
authors.forename: Sheng
authors.initials: S
authors.lastname: Yao
mesh_terms: D005030:Ethylenes / Q000737:chemistry*; D005449:Fluorenes / Q000737:chemistry*; D031541:Fluorescence Resonance Energy Transfer / Q000379:methods*; D005663:Furans / Q000737:chemistry; D015394:Molecular Structure; D010777:Photochemistry; D017785:Photons; D013876:Thiophenes / Q000737:chemistry
chemical_list: C516387:3,4-bis-(2,4,5-trimethyl-thiophen-3-yl)furan-2,5-dione; D005030:Ethylenes; D005449:Fluorenes; D005663:Furans; D013876:Thiophenes