Synthesis, Bifunctionalization, and Application of Isocyanurate-Based Periodic Mesoporous Organosilicas

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• 作者：Wen-Hua Zhang ; Xiaoning Zhang ; Zile Hua ; Parala Harish ; Felicitas Schroeder ; Stephan Hermes ; Thomas Cadenbach ; Jianlin Shi ; Roland A. Fischer
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：May 15, 2007
• 年：2007
• 卷：19
• 期：10
• 页码：2663 - 2670
• 全文大小：384K
• 年卷期：v.19,no.10(May 15, 2007)
• ISSN：1520-5002

文摘

Isocyanurate-containing silsesquioxane-bridged periodic mesoporous organosilicas (ICS-PMOs) weresynthesized by self-assembly of the nonionic surfactant P123, EO₂₀PO₇₀EO₂₀, and trimethoxysilyl-functionalized isocyanurate (ICS-Si) under acidic conditions in the presence of inorganic additives. TheICS-PMOs have been modified by an alkyl-bridged organosilane (i.e., Et-Si; Et = -CH₂CH₂-) bysubstituting ICS-Si with Et-Si in the precursors, at various molar ratios, resulting in bifunctionalizedPMOs exhibiting two types of bridged groups (ICS-Et-PMOs). The obtained bifunctionalized ICS-Et-PMOs have been characterized by X-ray diffraction, transmission electron microscopy, nitrogenphysical sorption, and solid-state ²⁹Si and ¹³C magic angle spinning NMR spectroscopy. Experimentsshow that the ICS-Et-PMOs exhibit hexagonal mesoscopic structures. Increasing the content of theEt-Si functionality in the precursors is found to significantly improve the mesostructural ordering of theproduct. It is suggested that fluoride anions as additives play an important role in the formation of well-ordered ICS-PMOs and as well the bifunctionalized ICS-Et-PMOs in the presented experiments. TheICS-PMO materials were used to chemically adsorb H₂PtCl₆, and Pt nanoparticles were subsequentlyprepared within the mesopores of ICS-PMO by NaBH₄ reduction in solution, highlighting the simplicityin exploiting the application of such PMOs in nanomaterials fabrication.