Imprinting With Phenyl Group Interactions: A Case Study of the Hybrid Sol−Gel Encapsulation of the Complex {Na[Ph2P(O)−CH2−P(O)Ph2]3}

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• 作者：Nina M. Wichner ; Nugzar Ghavtadze ; Ernst-Ulrich Wrthwein ; Hubert Koller
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：December 30, 2010
• 年：2010
• 卷：114
• 期：51
• 页码：22590-22596
• 全文大小：306K
• 年卷期：v.114,no.51(December 30, 2010)
• ISSN：1932-7455

文摘

The sodium complex cation, {Na[Ph₂P(O)−CH₂−P(O)Ph₂]₃}⁺, is used as a guest species in acid-catalyzed aqueous sol−gel processes of tetraethoxysilane and phenyltriethoxysilane. Raman spectroscopy in combination with band assignments from DFT calculations, solid-state NMR, and thermal analyses are applied to study the structural integrity of the sodium complex and to characterize the structural properties of the sol−gel materials. The sodium complex is decomposed at a synthesis pH value of 1, whereas it is encapsulated intact at pH = 4. Calcination removes the complex, and micropores are observed. Phenyl group interactions between the complex surface and the phenyl-functionalized hybrid gel are suggested to take place in the encapsulation process. The spherically shaped sodium complex serves as a model compound for surface interactions between aromatic groups during the genesis of an encapsulated sol−gel hybrid material, and it can be regarded as a soft complex, whose structural stability is of the same order as the interaction energy with its environment.