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Red aqueous room-temperature phosphorescence modulated by anion-π and intermolecular electronic coupling interactions
Fengbo Liu1, Hai Yang1, Dongdong Sun1
1School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology Wuhan 430081 China liusimin@wust.edu.cn.
Chemical Science
|July 8, 2022
Summary
Researchers modulated aqueous room temperature phosphorescence (aRTP) in organic materials using anion-π interactions and electronic coupling. Cucurbit[8]uril complexation unexpectedly enhanced aRTP, offering new avenues for material design.
Area of Science:
- Organic Chemistry
- Photophysics
- Supramolecular Chemistry
Background:
- Aqueous room temperature phosphorescence (aRTP) from organic materials is challenging.
- Understanding molecular interactions in water is crucial for developing new phosphorescent materials.
Purpose of the Study:
- To modulate the red aRTP emission of 2Br-NDI in water.
- To investigate the roles of anion-π interactions and intermolecular electronic coupling.
- To explore the impact of macrocyclic cucurbit[n]urils (CB[n]s) on aRTP.
Main Methods:
- Synthesis of 2Br-NDI, a water-soluble naphthalene diimide derivative.
- Experimental characterization of anion-π interactions between chloride ions and 2Br-NDI.
- Investigating complexation of 2Br-NDI with cucurbit[n]urils (CB[7], CB[8], CB[10]).
- Spectroscopic analysis of aRTP emission modulation.
Main Results:
- Anion-π interactions between Cl- and 2Br-NDI were stabilized in water, evidenced by a distinct emission pathway.
- Exclusion complexation of 2Br-NDI with CB[8] unexpectedly yielded the strongest and longest-lived aRTP.
- This enhancement was attributed to strong intermolecular electronic coupling between CB[8] and 2Br-NDI.
Conclusions:
- Aqueous anion-π recognition can be effectively utilized to modulate organic phosphorescence.
- CB[8] complexation offers a novel strategy for significantly enhancing aRTP in aqueous media.
- Findings provide inspiration for designing advanced aqueous anion-π recognition systems and CB[n]-based aRTP materials.
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