New mesoporous covalent frameworks, based on hybrid fluorinated organosilicas, were prepared to realize a periodic architecture of fast molecular rotors containing dynamic dipoles in their structure. The mobile elements, designed on the basis of fluorinated p-divinylbenzene moieties, were integrated into the robust covalent structure through siloxane bonds, and showed not only the rapid dynamics of the aromatic rings (ca. 108 Hz at 325 K), as detected by solid-state NMR spectroscopy, but also a dielectric response typical of a fast dipole reorientation under the stimuli of an applied electric field. Furthermore, the mesochannels are open and accessible to diffusing in gas molecules, and rotor mobility could be individually regulated by I2 vapors. The iodine enters the channels of the periodic structure and reacts with the pivotal double bonds of the divinyl-fluoro-phenylene rotors, affecting their motion and the dielectric properties.

Bracco, S., Beretta, M., Cattaneo, A., Comotti, A., Falqui, A., Zhao, K., et al. (2015). Dipolar rotors orderly aligned in mesoporous fluorinated organosilica architectures. ANGEWANDTE CHEMIE. INTERNATIONAL EDITION, 54(16), 4773-4777 [10.1002/anie.201412412].

Dipolar rotors orderly aligned in mesoporous fluorinated organosilica architectures

Bracco, S
Primo
Membro del Collaboration Group
;
Beretta, M
Secondo
Membro del Collaboration Group
;
Cattaneo, AS;Comotti, A
;
Sozzani, PE
Ultimo
2015

Abstract

New mesoporous covalent frameworks, based on hybrid fluorinated organosilicas, were prepared to realize a periodic architecture of fast molecular rotors containing dynamic dipoles in their structure. The mobile elements, designed on the basis of fluorinated p-divinylbenzene moieties, were integrated into the robust covalent structure through siloxane bonds, and showed not only the rapid dynamics of the aromatic rings (ca. 108 Hz at 325 K), as detected by solid-state NMR spectroscopy, but also a dielectric response typical of a fast dipole reorientation under the stimuli of an applied electric field. Furthermore, the mesochannels are open and accessible to diffusing in gas molecules, and rotor mobility could be individually regulated by I2 vapors. The iodine enters the channels of the periodic structure and reacts with the pivotal double bonds of the divinyl-fluoro-phenylene rotors, affecting their motion and the dielectric properties.
Articolo in rivista - Articolo scientifico
Dielectric spectroscopy; Hybrid materials; Molecular rotors; NMR spectroscopy; Porous materials; Chemistry (all); Catalysis;
English
16-feb-2015
2015
54
16
4773
4777
partially_open
Bracco, S., Beretta, M., Cattaneo, A., Comotti, A., Falqui, A., Zhao, K., et al. (2015). Dipolar rotors orderly aligned in mesoporous fluorinated organosilica architectures. ANGEWANDTE CHEMIE. INTERNATIONAL EDITION, 54(16), 4773-4777 [10.1002/anie.201412412].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/96539
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