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EnglishHere, we present a new family of light-responsive, fluorinated supramolecular liquid crystals (LCs) showing efficient and reversible light-induced LC-to-isotropic phase transitions. Our materials design is based on fluorinated azobenzenes, where the fluorination serves to strengthen the noncovalent interaction with bond-accepting stilbazole molecules, and increase the lifetime of the cis-form of the azobenzene units. The halogen-bonded LCs were characterized by means of X-ray diffraction, hot-stage polarized optical microscopy, and differential scanning calorimetry. Simultaneous analysis of light-induced changes in birefringence, absorption, and optical scattering allowed us to estimate that <4% of the mesogenic units in the cis-form suffices to trigger the full LC-to-isotropic phase transition. We also report a light-induced and reversible crystal-to-isotropic phase transition, which has not been previously observed in supramolecular complexes. In addition to fundamental understanding of light-responsive supramolecular complexes, we foresee this study to be important in the development of bistable photonic devices and supramolecular actuators.
| Data di pubblicazione: | 2016 |
| Titolo: | Efficient light-induced phase transitions in halogen-bonded liquid crystals |
| Autori: | |
| Citazione: | Fernandez-Palacio F., Poutanen M., Saccone M., Siiskonen A., Terraneo G., Resnati G., et al. (2016). Efficient light-induced phase transitions in halogen-bonded liquid crystals. CHEMISTRY OF MATERIALS, 28(22), 8314-8321. |
| Rivista: | |
| Digital Object Identifier (DOI): | 10.1021/acs.chemmater.6b03460 |
| Abstract: | Here, we present a new family of light-responsive, fluorinated supramolecular liquid crystals (LCs) showing efficient and reversible light-induced LC-to-isotropic phase transitions. Our materials design is based on fluorinated azobenzenes, where the fluorination serves to strengthen the noncovalent interaction with bond-accepting stilbazole molecules, and increase the lifetime of the cis-form of the azobenzene units. The halogen-bonded LCs were characterized by means of X-ray diffraction, hot-stage polarized optical microscopy, and differential scanning calorimetry. Simultaneous analysis of light-induced changes in birefringence, absorption, and optical scattering allowed us to estimate that <4% of the mesogenic units in the cis-form suffices to trigger the full LC-to-isotropic phase transition. We also report a light-induced and reversible crystal-to-isotropic phase transition, which has not been previously observed in supramolecular complexes. In addition to fundamental understanding of light-responsive supramolecular complexes, we foresee this study to be important in the development of bistable photonic devices and supramolecular actuators. |
| URL: | http://pubs.acs.org/journal/cmatex |
| Settore Scientifico Disciplinare: | Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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| Efficient Light-Induced Phase Transitions in Halogen-Bonded Liquid Crystals.pdf | Articolo open access | Versione Editoriale | Open Access Visualizza/Apri |
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