Carboxylic groups in mesoporous silica and ethane-bridged organosilica: effect of the surface on the reactivity

文献情報

出版日 2010-11-15

DOI 10.1039/C0CP01260B

インパクトファクター 3.676

著者

Sonia Fiorilli, Beatrice Camarota, Edoardo Garrone, Barbara Onida

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要旨

Proton-donor ability of carboxylic groups incorporated by co-condensation into SBA-15 and ethane-bridged periodic mesoporous organosilica (PMO) has been studied through IR spectroscopy by dosing ammonia, which forms reversibly COO− groups and NH4+ ions. The related equilibrium constants, determined by elaboration of IR data, reveal a lower reactivity of –COOH groups at the surface of PMO than on SBA-15, when the two samples have been outgassed at the same temperature. This finding is interpreted in terms of different dielectric constants and intermolecular interactions engaged with the surface species. Carboxylic groups on ethane-bridged organosilica react with silanols upon thermal treatment at 473 K to form a mixed anhydride species Si–O–C(O)–, at variance with the same groups on SBA-15.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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