IR-spectroscopic study of lewis acid centers on polyzirconiummethylsiloxanes

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• 作者：L. M. Kustov (1) lmk@ioc.ac.ru
  O. P. Tkachenko (1)
  L. A. Bondar鈥?/a>(2)
• 刊名：Russian Journal of Physical Chemistry A ; Focus on Chemistry
• 出版时间：January 2010
• 出版年：2010
• 期刊代码：pc384_0036-0244
• 类别：ch
• 卷：84
• 期：7
• 页码：1226-1229
• 数据来源：sp

摘要

Acid centers on the surface of polyzirconiummethylsiloxanes (PZMS) containing 5 and 10%ZrO₂ were studied by diffuse-reflectance IR-spectroscopy. Deuterated acetonitrile adsorbed at room temperature at a 96 torr saturated vapor pressure was used as a probe-molecule for acid centers. It was shown that zirconium ions were not built into the matrix but were situated predominantly on the surface of the siliconoxygen framework of silica gels. The introduction of zirconium ions into the polymethylsiloxane matrix at the stage of sol formation caused the appearance of Lewis acid centers (coordinatively unsaturated zirconium ions) on the surface of PZMS along with centers of the physical adsorption of CD₃CN.