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Open AccessCommunication
Molecules 2012, 17(4), 4452-4459; doi:10.3390/molecules17044452

Selective Formation of Twisted Intramolecular Charge Transfer and Excimer Emissions on 2,7-bis(4-Diethylaminophenyl)-fluorenone by Choice of Solvent

1
Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
2
PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan
*
Author to whom correspondence should be addressed.
Received: 1 March 2012 / Revised: 30 March 2012 / Accepted: 6 April 2012 / Published: 13 April 2012
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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.
Keywords: twisted intramolecular charge transfer (TICT); excimer; intermolecular charge transfer; fluorenone; donor acceptor dye twisted intramolecular charge transfer (TICT); excimer; intermolecular charge transfer; fluorenone; donor acceptor dye
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MDPI and ACS Style

Shigeta, M.; Morita, M.; Konishi, G.-I. Selective Formation of Twisted Intramolecular Charge Transfer and Excimer Emissions on 2,7-bis(4-Diethylaminophenyl)-fluorenone by Choice of Solvent. Molecules 2012, 17, 4452-4459.

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