- Photoresponsive ordered hybrid materials containing a bridged azobenzene group
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This paper describes the synthesis of 4,4′-[(triisopropoxysilyl) propyloxy]azobenzene and the preparation of the ordered hybrid material containing the bridged azobenzene moieties within the framework by using the direct liquid crystal templating approach. We show that a sizable fraction of the azobenzene groups is reversibly photoisomerized though the chromophore is covalently linked to the silica matrix at both ends. In contrast, the photoisomerization did not occur in the corresponding material prepared in the absence of template. This is explained by a regular dilution of the chromophores into silica thanks to the template used for the preparation of the material. The Royal Society of Chemistry 2005.
- Besson, Eric,Mehdi, Ahmad,Lerner, Dan A.,Reye, Catherine,Corriu, Robert J. P.
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- Hydrolysis rate of functionalized fullerenes bearing alkoxysilanes: A comparative study
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Soluble fulleropyrrolidines bearing a trialkoxysilyl functionality (methoxy, ethoxy, butoxy, and isopropoxy) have been prepared and characterized. The hydrolysis rate constant for each fulleropyrrolidine was measured with 1H NMR spectroscopy by following the disappearance of selected resonances of the fullerene substrate under the conditions (HCl/ H 2O/THF) used for the preparation of fullerene-doped solgel glasses. It has been found that fulleropyrrolidine 1, bearing the trimethoxysilyl group, hydrolyzes faster than substrates 2-7 and should be the reagent of choice to minimize aggregation of the fullerene spheroid in sol-gel glassy matrices. The triethoxysilyl derivative 2, our benchmark fulleropyrrolidine for incorporation in sol-gel glasses, has the second fastest hydrolysis rate. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
- Bianco, Alberto,Maggini, Michele,Nogarole, Marco,Scorrano, Gianfranco
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p. 2934 - 2941
(2007/10/03)
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- Cyclic diol-derived blocked mercaptofunctional silane compositions
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Diol derived blocked mercaptofunctional silane compositions in which the silanes comprise cyclic and bridged alkoxy groups derived from hydrocarbon-based diols and processes for their preparation are provided. Also provided are rubber compositions comprising the cyclic diol-derived blocked mercaptofunctional silanes, processes for their preparation and articles of manufacture comprising the rubber compositions, in particular, automotive tires and components thereof.
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(2010/02/14)
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