Jul, 2017
Photo-Responsive Soft Ionic Crystals: Ion-Pairing Assemblies of Azobenzene Carboxylates
CHEMISTRY-A EUROPEAN JOURNAL
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- Volume
- 23
- Number
- 39
- First page
- 9244
- Last page
- 9248
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1002/chem.201701925
- Publisher
- WILEY-V C H VERLAG GMBH
This report delineates the design and synthesis of negatively charged azobenzene derivatives that form photo-responsive ion-pairing assemblies. The azobenzene carboxylates possessing aliphatic chains were prepared as photo-responsive anions that promote the formation of ion-pairing dimension-controlled assemblies, including mesophases, when used in conjunction with a tetrabutylammonium (TBA) cation. The photo-responsive properties of the ion pairs and the precursory carboxylic acids in the bulk state were examined by polarized optical microscopy (POM) and X-ray diffraction (XRD), demonstrating that liquid crystal (LC)-liquid and crystal-liquid phase transitions occurred, depending on the number and lengths of the aliphatic chains of each assembly. An ion pair exhibited photo-induced crystal-crystal phase transitions upon switching between two irradiation wavelengths (365/436 nm).
- Link information
- ID information
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- DOI : 10.1002/chem.201701925
- ISSN : 0947-6539
- eISSN : 1521-3765
- Web of Science ID : WOS:000405284900004