Immobilization of Chlorosulfonyl-Calix[4]arene onto the surface of silica gel through the directly estrification

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• 作者：Saeed Taghvaei-Ganjali^a ; ^{S-taghvaei@IAU-tnb.ac.ir} ; Reza Zadmard^b ; Mandana Saber-Tehrani^a
• 关键词：Silica gel ; Immobilization ; Chlorosulfonyl-Calix[4]arene ; Estrification
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 June, 2012
• 卷：258
• 期：16
• 页码：5925-5932
• 文件大小：1177 K

摘要

For the first time Chlorosulfonyl-Calix[4]arene has been chemically bonded to silica gel through the directly estrification without silane coupling agent to prepare Chlorosulfonyl-Calix[4]arene-bonded silica gel. Sample characterization was performed by various techniques such as elemental analysis, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), powder X-ray diffraction (XRD), N₂ adsorption-desorption, thermal gravimetric analysis (TGA), ²⁹Si CP/MAS spectroscopy and acid-base titration. All data approve the successful incorporation of organic group via covalent bond. From the comparison between sulfur content determined by elemental analysis and the number of H⁺ determined by acid-base titration, it was shown that two ester units took place onto the new synthesized sample and two acidic sites exist on the surface.