Reversible Interlayer Sliding and Conductivity Changes in Adaptive Tetrathiafulvalene-Based Covalent Organic
Songliang Cai1,2, Bing Sun2,3, Xinle Li2
1School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China.
Researchers demonstrated reversible interlayer sliding in a tetrathiafulvalene-based covalent organic framework (COF). This structural control allows dynamic tuning of optoelectronic properties, opening new avenues for advanced materials.
Area of Science:
- Materials Science
- Nanotechnology
- Organic Chemistry
Background:
- Ordered interlayer stacking in 2D covalent organic frameworks (COFs) significantly influences their optoelectronic properties.
- Reversible interlayer sliding offers a dynamic method for controlling COF structure and properties but remains unexplored in 2D COFs.
Purpose of the Study:
- To investigate and demonstrate reversible interlayer sliding in a 2D COF.
- To explore the correlation between structural changes and optoelectronic property modulation.
- To establish a new structural control mechanism for 2D COFs.
Main Methods:
- Synthesis of an imine-linked tetrathiafulvalene (TTF)-based COF (TTF-DMTA).
- Solvent treatment to induce crystalline phase changes (staircase-like to slipped eclipsed structures).
- Spectroscopic analysis and electrical conductivity measurements on oriented COF thin films.
Main Results:
- Demonstrated reversible interlayer sliding in TTF-DMTA COF via solvent treatment.
- Observed reversible changes in spectroscopic and electrical conductivity properties correlating with structural phase transitions.
- A related COF (TTF-TA) lacking methoxy groups did not exhibit reversible switching.
Conclusions:
- This study presents the first example of reversible interlayer sliding in a 2D COF, enabling access to distinct aggregated states.
- The findings establish a novel structural control pathway for tuning COF properties.
- This structural tunability may lead to applications in chemiresistive sensors.
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