Periodic Mesoporous Organosilica Materials: Self‐Assembly of Carbamothioic Acid‐Bridged Organosilane Precursors

• Published in: Chemistry : a European journal 2009-08, Vol.15 (33), p.8310-8318
• Main Authors: Gao, Ling, Wei, Feng, Zhou, Yu, Fan, Xiao Xing, Wang, Ying, Zhu, Jian Hua
• Format: Article
• Language: English
• Subjects: fibers; mesoporous materials; morphology; silanes; sol–gel processes
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.200900352

A new series of carbamothioic acid‐containing periodic mesoporous organosilica (PMO) materials has been synthesized by a direct cocondensation method, in which an organosilica precursor N,S‐bis[3‐(triethoxysilyl)propyl]carbamothioic acid (MI) is treated with tetraethyl orthosilicate (TEOS), and the nonionic surfactant Pluronic 123 (P123) is used as a template under acidic conditions in the presence of inorganic additives. Moreover, the synthesis of the PMO material consisting of the MI precursor without TEOS has been realized. These novel PMO materials have large surface areas, well‐ordered mesoporous structures, hollow fiberlike morphologies, and thick walls. They are also structurally well‐ordered with a high organosilica precursor content, and the carbamothioic acid groups are thermally stable up to 250 °C. Furthermore, the organosilica materials exhibit hydrothermal stability in basic solution. Establishing a framework: A periodic mesoporous organosilica (PMO) precursor has been prepared that contains large carbamothioic acid bridging groups (see picture). The resulting PMO material has a large surface area, well‐ordered mesoporous structure, hollow fiberlike morphology, and thick walls.