The Enhanced Intramolecular Energy Transfer and Strengthened ff Luminescence of a Stable Helical Eu Complex in Ionic Liquids
Abstract
:1. Introduction
2. Results and Discussion
2.1. Electronic Structure of EuL in [BMIM][PF6]
2.1.1. Electronic Absorption and Luminescence Properties
2.1.2. Energy Transfer Efficiency
2.1.3. Estimation of the Energy Donor State
2.1.4. Effect of the Viscosity of [BMIM][PF6] on the Energy Transfer Efficiency of EuL
2.2. Temperature Dependence of the Structure and Luminescence Properties of EuL in [EMIM][PF6]
2.2.1. Luminescence Properties
2.2.2. Structural Analyses
2.2.3. Temperature Dependence of Luminescence Properties
3. Materials and Methods
3.1. Reagents and Materials
3.2. Measurements
4. Conclusions
Supplementary Materials
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Sample Availability: Samples of the compounds are available from the authors. |
ϕff (%) a | τobs (ms) b | |
---|---|---|
in [BMIM][PF6] | 32.3 | 1.48 |
in acetonitrile | 12.0 | 1.55 |
ϕT (%) a | τT(ns) b | kNR(T) (s−1) | |
---|---|---|---|
in [BMIM][PF6] | <0.1 | ca. 200 | 5.0 × 106 |
in ethanol | <0.1 | ca. 5 | 2.0 × 108 |
Molar Ratios [BMIM][PF6]: Acetonitrile | ν (mPa·s) | ϕff(%) a | τobs(ms) b | kR (s−1) | kNR (s−1) | ηEnT (%) | |
---|---|---|---|---|---|---|---|
1.00 | 0.00 | 198.18 | 32.3 | 1.46 | 287.2 | 388.5 | 76.0 |
0.64 | 0.36 | 40.69 | 30.0 | 1.42 | 300.7 | 403.6 | 70.3 |
0.59 | 0.41 | 23.84 | 17.6 | 1.46 | 254.3 | 430.6 | 47.4 |
0.43 | 0.75 | 9.15 | 15.8 | 1.43 | 254.6 | 444.7 | 43.4 |
0.35 | 0.65 | 5.31 | 12.1 | 1.49 | 255.2 | 416.0 | 31.8 |
0.20 | 0.80 | 1.87 | 11.6 | 1.45 | 257.6 | 432.0 | 31.1 |
0.00 | 1.00 | 0.48 | 12.0 | 1.55 | 266.2 | 379.0 | 29.1 |
ϕff (%) a | τobs (ms) b | ηEnT (%) |
---|---|---|
52.1 | 1.37 | >99 |
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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
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 StyleHasegawa, 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