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Two-dimensional structural ordering in a chromophoric ionic liquid for triplet energy migration-based photon
Shota Hisamitsu1, Nobuhiro Yanai, Hironori Kouno
1Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan. yanai@mail.cstm.kyushu-u.ac.jp n-kimi@mail.cstm.kyushu-u.ac.jp.
Researchers developed a novel chromophoric ionic liquid with 2D nanostructure. Triplet excitons can diffuse across nanostructured domains in this material, impacting its optical properties.
Area of Science:
- Materials Science
- Photochemistry
- Supramolecular Chemistry
Background:
- Ionic liquids (ILs) are versatile materials with tunable properties.
- Chromophoric ILs combine ionic liquid characteristics with light-absorbing capabilities.
- Understanding nanostructural order in ILs is crucial for their application in photonics.
Purpose of the Study:
- To develop a novel chromophoric ionic liquid with 2D nanostructural order.
- To investigate the structure-property relationship using photon upconversion.
- To explore triplet energy migration and exciton diffusion within the nanostructured IL.
Main Methods:
- Synthesis of a novel ion pair comprising 9,10-diphenylanthracene-2-sulphonate (DPAS) and an asymmetric quaternary phosphonium ion.
- Single crystal X-ray diffraction to analyze the ionic crystal (IC) phase structure.
- Powder X-ray diffraction to characterize the IL phase nanostructure.
- Photon upconversion measurements based on triplet-triplet annihilation (TTA) to study triplet exciton dynamics.
Main Results:
- A chromophoric ionic liquid exhibiting both ionic crystal and supercooled IL phases at room temperature was successfully developed.
- X-ray analysis revealed an alternating layered structure of polar and non-polar domains, maintained in the IL phase.
- The diffusion length of triplet excitons in the IL phase was found to be larger than the estimated domain size.
Conclusions:
- The developed chromophoric ionic liquid possesses a stable 2D nanostructural order.
- Triplet excitons demonstrate the ability to diffuse beyond individual nanostructured domains.
- This finding has implications for designing advanced photonic materials based on ordered ionic liquids.
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