Dipolar Rotors Orderly Aligned in Mesoporous Fluorinated Organosilica Architectures |
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| Authors: | Dr Silvia Bracco Dr Mario Beretta Dr Alice Cattaneo Prof Angiolina Comotti Prof Andrea Falqui Dr Ke Zhao Prof Charles Rogers Prof Piero Sozzani |
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| Affiliation: | 1. Department of Materials Science, University of Milano Bicocca, Via R. Cozzi 55, Milano (Italy);2. Biological and Environmental Sciences and Engineering Division, King Abdullah University for Science and Technology, Thuwal 23955‐6900 (Kingdom of Saudi Arabia);3. Department of Physics, University of Colorado Boulder, 2000 Colorado Ave., Boulder, Colorado 80309 (USA) |
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| 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. |
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| Keywords: | dielectric spectroscopy hybrid materials molecular rotors NMR spectroscopy porous materials |
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