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

ABSTRACT: 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][PF?] and [EMIM][PF?]. A colorless solution of EuL dissolved in [BMIM][PF?] 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][PF?] as a result of the suppression of molecular fluctuations in the ligands. Additionally, a highly luminescent helical structure is preserved in [EMIM][PF?] up to 120 °C.

SUBMITTER: Hasegawa Y

PROVIDER: S-EPMC6017298 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature

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

Hasegawa Yuki Y Ishii Ayumi A Inazuka Yudai Y Yajima Naho N Kawaguchi Shogo S Sugimoto Kunihisa K Hasegawa Miki M

Molecules (Basel, Switzerland) 20180124 2

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 relaxati ...[more]

PMID: 29364146

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