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Modulating Room-Temperature Phosphorescence by Coordination Interactions and Structural Rigidity in Dual-Ligand MOFs.

Xiaolin Yu1, Zixuan Zhou1, Dmitry I Pavlov1,2

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This summary is machine-generated.

Researchers developed new metal-organic frameworks (MOFs) with tunable room-temperature phosphorescence (RTP). This breakthrough enhances information security through advanced anticounterfeiting strategies and provides insights into MOF design for RTP materials.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Coordination Chemistry

Background:

  • Room-temperature phosphorescence (RTP) in metal-organic frameworks (MOFs) is crucial for data security and anti-counterfeiting.
  • Understanding the interplay between coordination interactions and framework rigidity is key to controlling RTP properties.

Purpose of the Study:

  • To investigate the impact of coordination interactions and structural rigidity on RTP behavior in MOFs.
  • To design and synthesize novel MOFs with precisely controlled RTP performance.
  • To develop a time-resolved information encryption and anticounterfeiting strategy.

Main Methods:

  • Dual-ligand cooperative design strategy (M + LC + LX) to modulate ligand coordination and framework rigidity.
  • Construction and characterization of four novel Cadmium-based MOFs (Cd-MOFs).
  • Single-crystal X-ray diffraction (SCXRD) analysis and Density Functional Theory (DFT) calculations.

Main Results:

  • Precise control over RTP performance was achieved in the synthesized Cd-MOFs.
  • Direct coordination of the carboxylate ligand (LC) is essential for RTP activation.
  • Framework dimensionality and suppression of vibrational relaxation by auxiliary ligands extended triplet-state lifetimes up to 153 ms.
  • A time-resolved encryption strategy was developed using distinct afterglow and color evolution.

Conclusions:

  • The study elucidates the synergistic mechanism of coordination interactions and structural rigidity on RTP behavior in MOFs.
  • Provides a rational design approach for high-performance RTP functional materials.
  • Demonstrates a novel strategy for information encryption and anticounterfeiting with enhanced security.