Archivio istituzionale della ricerca dell'Università degli Studi di Palermo
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EnglishIt is demonstrated that halogen bonding can be used to construct low-molecular-weight supramolecular complexes with unique light-responsive properties. In particular, halogen bonding drives the formation of a photoresponsive liquid-crystalline complex between a non-mesogenic halogen bond-donor molecule incorporating an azo group, and a non-mesogenic alkoxystilbazole moiety, acting as a halogen bond-acceptor. Upon irradiation with polarized light, the complex exhibits a high degree of photoinduced anisotropy (order parameter of molecular alignment > 0.5). Moreover, efficient photoinduced surface-relief-grating (SRG) formation occurs upon irradiation with a light interference pattern, with a surface-modulation depth 2.4 times the initial film thickness. This is the first report on a halogen-bonded photoresponsive low-molecular-weight complex, which furthermore combines a high degree of photoalignment and extremely efficient SRG formation in a unique way. This study highlights the potential of halogen bonding as a new tool for the rational design of high-performance photoresponsive suprastructures. An unprecedented optical performance is reported for a novel photoresponsive supramolecular liquid-crystalline complex, self-assembled through halogen bonding between a non-mesogenic stilbazole derivative, acting as a bond acceptor, and a non-mesogenic bond donor containing an azo-group. Efficient photoalignment and an exceptional surface-relief-grating formation are combined in this low-molecular-weight supramolecular assembly, thanks to the high directionality of the halogen bond. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Priimagi, A., Saccone, M., Cavallo, G., Shishido, A., Pilati, T., Metrangolo, P., et al. (2012). Photoalignment and surface-relief-grating formation are efficiently combined in low-molecular-weight halogen-bonded complexes. ADVANCED MATERIALS, 24(44), OP345-OP352 [10.1002/adma.201204060].
| Data di pubblicazione: | 2012 | |
| Titolo: | Photoalignment and surface-relief-grating formation are efficiently combined in low-molecular-weight halogen-bonded complexes | |
| Autori: | ||
| Citazione: | Priimagi, A., Saccone, M., Cavallo, G., Shishido, A., Pilati, T., Metrangolo, P., et al. (2012). Photoalignment and surface-relief-grating formation are efficiently combined in low-molecular-weight halogen-bonded complexes. ADVANCED MATERIALS, 24(44), OP345-OP352 [10.1002/adma.201204060]. | |
| Rivista: | ||
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1002/adma.201204060 | |
| Abstract: | It is demonstrated that halogen bonding can be used to construct low-molecular-weight supramolecular complexes with unique light-responsive properties. In particular, halogen bonding drives the formation of a photoresponsive liquid-crystalline complex between a non-mesogenic halogen bond-donor molecule incorporating an azo group, and a non-mesogenic alkoxystilbazole moiety, acting as a halogen bond-acceptor. Upon irradiation with polarized light, the complex exhibits a high degree of photoinduced anisotropy (order parameter of molecular alignment > 0.5). Moreover, efficient photoinduced surface-relief-grating (SRG) formation occurs upon irradiation with a light interference pattern, with a surface-modulation depth 2.4 times the initial film thickness. This is the first report on a halogen-bonded photoresponsive low-molecular-weight complex, which furthermore combines a high degree of photoalignment and extremely efficient SRG formation in a unique way. This study highlights the potential of halogen bonding as a new tool for the rational design of high-performance photoresponsive suprastructures. An unprecedented optical performance is reported for a novel photoresponsive supramolecular liquid-crystalline complex, self-assembled through halogen bonding between a non-mesogenic stilbazole derivative, acting as a bond acceptor, and a non-mesogenic bond donor containing an azo-group. Efficient photoalignment and an exceptional surface-relief-grating formation are combined in this low-molecular-weight supramolecular assembly, thanks to the high directionality of the halogen bond. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. | |
| Settore Scientifico Disciplinare: | Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie | |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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http://hdl.handle.net/10447/390257
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