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Article

The Enhanced Intramolecular Energy Transfer and Strengthened ff Luminescence of a Stable Helical Eu Complex in Ionic Liquids

1
Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara 252-5258, Kanagawa, Japan
2
JST, PRESTO, 4-1-8 Honcho, Kawaguchi 332-0012, Saitama, Japan
3
Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), 1-1-1 Kouto, Sayo 679-5198, Hyogo, Japan
*
Authors to whom correspondence should be addressed.
Molecules 2018, 23(2), 55; https://doi.org/10.3390/molecules23020055
Received: 12 December 2017 / Revised: 14 January 2018 / Accepted: 17 January 2018 / Published: 24 January 2018
(This article belongs to the Special Issue Lanthanide Luminescence: Fundamental Research and Applications)
The luminescence of a Eu complex (EuL) is enhanced by stabilization of the coordination structure in highly viscous ionic liquids. The EuL was found to maintain a stable single helical structure both in organic solvents and in the ionic liquids [BMIM][PF6] and [EMIM][PF6]. A colorless solution of EuL dissolved in [BMIM][PF6] exhibits bright red luminescence with a quantum yield of 32.3%, a value that is much higher than that in acetonitrile (12%). Estimated rate constants for the energy relaxation pathway indicate that the energy transfer efficiency is enhanced in [BMIM][PF6] as a result of the suppression of molecular fluctuations in the ligands. Additionally, a highly luminescent helical structure is preserved in [EMIM][PF6] up to 120 °C. View Full-Text
Keywords: Eu complex; ionic liquid; luminescence; energy transfer; molecular fluctuation Eu complex; ionic liquid; luminescence; energy transfer; molecular fluctuation
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MDPI and ACS Style

Hasegawa, Y.; Ishii, A.; Inazuka, Y.; Yajima, N.; Kawaguchi, S.; Sugimoto, K.; Hasegawa, M. The Enhanced Intramolecular Energy Transfer and Strengthened ff Luminescence of a Stable Helical Eu Complex in Ionic Liquids. Molecules 2018, 23, 55. https://doi.org/10.3390/molecules23020055

AMA Style

Hasegawa Y, Ishii A, Inazuka Y, Yajima N, Kawaguchi S, Sugimoto K, Hasegawa M. The Enhanced Intramolecular Energy Transfer and Strengthened ff Luminescence of a Stable Helical Eu Complex in Ionic Liquids. Molecules. 2018; 23(2):55. https://doi.org/10.3390/molecules23020055

Chicago/Turabian Style

Hasegawa, Yuki, Ayumi Ishii, Yudai Inazuka, Naho Yajima, Shogo Kawaguchi, Kunihisa Sugimoto, and Miki Hasegawa. 2018. "The Enhanced Intramolecular Energy Transfer and Strengthened ff Luminescence of a Stable Helical Eu Complex in Ionic Liquids" Molecules 23, no. 2: 55. https://doi.org/10.3390/molecules23020055

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