title: Selective formation of twisted intramolecular charge transfer and excimer emissions on 2,7-bis(4-diethylaminophenyl)-fluorenone by choice of solvent.
abstract: We designed and synthesized a donor-acceptor-donor dye consisting of a 2,7-disubstituted fluorenone with diethylaminophenyl moieties present as strong electron donating groups. Switching between twisted intramolecular charge transfer (TICT) emission and excimer emission was achieved, with no ground state changes, by simply changing the solvent used. In a nonpolar solvent, excimer emission was observed; with increasing polarity, the emission gradually disappeared, and the TICT emission appeared.
authors.affiliation: Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Shigeta
authors.forename: Mifumi
authors.initials: M
authors.lastname: Morita
authors.forename: Gen-ichi
authors.initials: G
authors.lastname: Konishi
mesh_terms: D004553:Electric Conductivity; D005449:Fluorenes / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D055672:Static Electricity
chemical_list: C574113:2,7-bis(4-diethylaminophenyl)-fluorenone; D005449:Fluorenes; D005456:Fluorescent Dyes; D012997:Solvents