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Cd-Based Coordination Frameworks with Multiple Optical Properties: Tunable RTP, Photochromism, and SHG Efficiency
Xue-Mei Jing1, Tong Liu1, Yu-Ying Xia1
1College of Chemistry and Chemical Engineering, Qingdao University, Shandong 266071, China.
Inorganic Chemistry
|June 6, 2025
Summary
Two novel cadmium-organic frameworks were synthesized, exhibiting room-temperature phosphorescence and photochromic properties for triple-message encryption. One framework also demonstrates second harmonic generation, useful for optical applications.
Area of Science:
- Materials Science
- Coordination Chemistry
- Luminescence
Background:
- Organic frameworks offer tunable properties for advanced applications.
- Luminescent materials are crucial for sensing and encryption technologies.
- Noncentrosymmetric materials are key for nonlinear optical phenomena.
Purpose of the Study:
- Synthesize novel cadmium-organic frameworks using specific ligands.
- Investigate the luminescent and photochromic properties of the synthesized compounds.
- Explore potential applications in security encryption and nonlinear optics.
Main Methods:
- Coordination-assisted self-assembly of cadmium ions with tri(pyridin-3-yl)amine and terephthalic acid.
- Characterization of crystal structures and luminescence properties (phosphorescence).
- Evaluation of photochromic behavior and second harmonic generation (SHG) effects.
Main Results:
- Two Cd-organic frameworks, [Cd3(PTA)3(TPA)] (1) and [Cd3(PTA)3(TPA)(DMA)]•2DMA (2), were successfully synthesized.
- Both compounds exhibit room-temperature phosphorescence (RTP), with compound 1 showing excitation-responsive emission and compound 2 displaying blue-green phosphorescence.
- Compounds 1 and 2 demonstrate photochromic behavior, enabling triple-message encryption when combined with fluorescence and phosphorescence. Compound 2 exhibits notable second harmonic generation.
Conclusions:
- The synthesized Cd-organic frameworks possess unique luminescent and photochromic properties.
- These materials offer a promising platform for multi-level security encryption systems.
- The noncentrosymmetric nature of compound 2 enables significant second harmonic generation, relevant for optical devices.
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