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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
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Room-Temperature Phosphorescence in Pure Organic Materials: Halogen Bonding Switching Effects
Lu Xiao1,2, Yishi Wu1, Zhenyi Yu1
1Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 28, 2017
Summary
Researchers developed novel organic materials exhibiting bright-red room-temperature phosphorescence (RTP). These materials show unique responses to stimuli, enabling potential applications in advanced sensors and security features.
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Organic room-temperature phosphorescence (ORTP) is highly desirable for applications like sensors and bio-imaging.
- Achieving stimuli-responsive ORTP remains a significant challenge in materials science.
Purpose of the Study:
- To develop novel stimuli-responsive organic materials with bright-red room-temperature phosphorescence (RTP).
- To investigate the mechanism of RTP emission and stimuli-responsive behavior in host-guest doped crystals.
Main Methods:
- Doping of two β-iminoenamine-BF₂ derivatives (S-2CN and S-2I) into a 4-iodoaniline crystalline matrix.
- Formation of halogen bonds (S-2CN⋅⋅⋅I-Ph-NH₂ and S-2I⋅⋅⋅I-Ph-NH₂) to induce RTP.
- Utilizing HCl treatment to trigger differential changes in RTP emission based on halogen bond stability.
Main Results:
- Bright-red RTP emissions were achieved from host-guest doped crystals (hgDCs) with quantum efficiencies up to 15.96%.
- HCl treatment selectively switched off RTP in S-2I/I-Ph-NH₂ hgDCs due to disrupted halogen bonding.
- RTP from S-2CN/I-Ph-NH₂ hgDCs remained stable, demonstrating differential stimuli-responsiveness.
Conclusions:
- The study successfully demonstrates the design of stimuli-responsive ORTP materials through halogen bonding in hgDCs.
- The distinct HCl-responsive behaviors enable the creation of security protection luminescence patterns.
- This work offers a promising strategy for developing advanced luminescent materials for sensing and security applications.
Keywords:
halogen bondingorganic luminescent materialsroom-temperature phosphorescencestimuli-responseswitching materialMore Related Videos
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