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TCNQ dianion-based coordination polymer whose open framework shows charge-transfer type guest inclusion
Satoru Shimomura1, Ryotaro Matsuda, Takashi Tsujino
1Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Journal of the American Chemical Society
|December 21, 2006
Summary
A novel 3D coordination framework using 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) was synthesized. This electron-rich material acts as an optical sensor for aromatics via charge-transfer interactions.
Area of Science:
- Materials Science
- Crystallography
- Supramolecular Chemistry
Background:
- Coordination frameworks offer tunable porous structures for molecular recognition.
- 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) is a versatile organic building block with strong electron-accepting properties.
Purpose of the Study:
- To synthesize and characterize a novel 3D coordination framework based on TCNQ.
- To investigate the framework's potential for optical sensing of aromatic compounds.
Main Methods:
- Three-dimensional coordination framework synthesis.
- Single-crystal X-ray diffraction for structural characterization.
- Optical spectroscopy to study charge-transfer interactions.
Main Results:
- Successful synthesis and structural elucidation of a TCNQ-based 3D coordination framework.
- The framework exhibits an electron-rich surface and an optical sensing cavity.
- Crystal-to-crystal transformation and strong accommodation of aromatic guests were observed.
- Sensing mechanism confirmed to be based on charge-transfer interactions.
Conclusions:
- The TCNQ-based coordination framework demonstrates potential as an optical sensor for aromatics.
- The observed crystal-to-crystal transformation highlights the dynamic nature of the framework.
- Charge-transfer interactions are key to the sensing capabilities of this material.
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