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Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch

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Solution-Mediated Photoreversible Switch Between 2D and 3D Hydrogen-Bonded Organic Frameworks.

Xiao Liu¹, Yingxiang Ye², Xu He¹

¹School of Chemical Engineering and Technology, Hebei University of Technology, XiPing Dao 5340, Beichen District, Tianjin, 300401, P.R. China.

Angewandte Chemie (International Ed. in English)

|May 31, 2025

Summary

Researchers developed a novel photoresponsive material that can reversibly switch between 3D and 2D structures using light. This light-induced transformation enables tunable properties and potential applications in anti-counterfeiting.

Keywords:

Configuration transformation Hydrogen‐bonded organic frameworks Lanthanide Luminescence Photoswitch

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Area of Science:

Materials Science
Supramolecular Chemistry
Crystallography

Background:

Photoresponsive crystalline porous materials offer tunable properties through light-induced structural changes.
Achieving reversible topological transformations in these materials remains a significant challenge.

Purpose of the Study:

To develop a novel photoresponsive material with light-driven reversible structural transformation.
To explore the potential of this material for applications like anti-counterfeiting.

Main Methods:

Self-assembly of a 3D hydrogen-bonded organic framework (HOF) using photochromic diarylethene (DAE) and tetrakis(4-amidiniumphenyl)methane (TAM).
Utilizing charge-assisted hydrogen bonds for framework construction.
Employing alternating UV and visible light irradiation to control DAE photoisomerization and induce reversible 3D-2D structural switching via solution-mediated processes.
Incorporating lanthanide complexes to investigate photochromic fluorescence resonance energy transfer (FRET).

Main Results:

A 3D hydrogen-bonded organic framework (HOF-OF) was successfully synthesized.
Reversible switching between 3D and 2D HOF structures was achieved through light-controlled DAE photoisomerization and solution-mediated recrystallization.
The material demonstrated a reversible luminescence on/off switch via DAE photoisomerization-controlled FRET between lanthanide and DAE moieties.

Conclusions:

The developed HOF-OF exhibits light-driven reversible structural transformation between 3D and 2D states.
The material shows potential for intelligent anti-counterfeiting applications due to its reversible luminescence switching.