pH-Responsive Bridged Silsesquioxane

被引:28
作者
Fertier, Laurent [1 ]
Theron, Christophe [1 ]
Carcel, Carole [1 ]
Trens, Philippe [1 ]
Man, Michel Wong Chi [1 ]
机构
[1] CNRS UMII ENSCM UMI, ICG Montpellier UMR 5253, F-34296 Montpellier 5, France
关键词
bridged silsesquioxanes; molecular recognition; pH-responsive hybrid silica; imprinting; MOLECULAR RECOGNITION PROPERTIES; CYANURIC ACID; SILICA MATERIALS; POROUS SILICA; PRECURSORS; HYBRIDS; MELAMINE; SILOXANE; DESIGN; SIEVES;
D O I
10.1021/cm103327y
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A pH-responsive bridged silsesquioxane was obtained via the sol-gel process from a bis-silylated triazine derivative bearing a triple DAD (donor-acceptor-donor) moiety which was strongly hydrogen-bonded to the three ADA (acceptor-donor-acceptor) sites of cyanuric acid. The latter template molecule was easily removed from the resulting hybrid material upon acidic treatment, which yielded the template-free bridged silsesquioxane with preserved morphology and unaltered particle size as demonstrated by SEM. As expected, the surface area of the acid-treated hybrid was significantly higher than that of the untreated material, as demonstrated by nitrogen adsorption measurements. The absence of cyanuric acid in this material was confirmed by solid state NMR. and by IR It was shown that a mild acidic medium (pH = 5.5) is sufficient to release the cyanuric acid template, thus providing a novel route to new hybrid materials with potential applications as efficient carriers for pH-responsive delivery systems.
引用
收藏
页码:2100 / 2106
页数:7
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