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Dipolar Rotors Orderly Aligned in Mesoporous Fluorinated Organosilica Architectures
Author(s) -
Bracco Silvia,
Beretta Mario,
Cattaneo Alice,
Comotti Angiolina,
Falqui Andrea,
Zhao Ke,
Rogers Charles,
Sozzani Piero
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201412412
Subject(s) - mesoporous organosilica , covalent bond , phenylene , dipole , molecule , materials science , dielectric , siloxane , mesoporous material , chemical physics , nanotechnology , solid state nuclear magnetic resonance , mesoporous silica , chemical engineering , chemistry , organic chemistry , polymer , optoelectronics , nuclear magnetic resonance , composite material , physics , engineering , catalysis
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. 10 8 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 I 2 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.