中华医学超声杂志

应用化学 ›› 1993, Vol. 0 ›› Issue (2): 78-80.

• 研究简报 • 上一篇    下一篇

硼酸和γ-氧化铝作为Lewis酸性固体模型物的热化学研究

刘祁涛, 张向东, 蒋湘顺, 薛邦明, 姜卉   

  1. 辽宁大学化学系 110036 沈阳
  • 收稿日期:1992-03-18 修回日期:1992-10-05 出版日期:1993-04-10 发布日期:1993-04-10
  • 基金资助:
    国家自然科学基金资助项目

A THERMOCHEMICAL STUDY ON THE ESTABLISHMENT OF SOLID MODEL OF LEWIS ACIDITY

Liu Qitao, Zhang Xiangdong, Jiang Xiangshun, Xue Bangming, Jiang Hui   

  1. Department of Chemistry, Liaoning University, 110036 Shenyang
  • Received:1992-03-18 Revised:1992-10-05 Published:1993-04-10 Online:1993-04-10

PDF

361

被引次数

1

摘要： 本文用热化学方法研究某些ⅢA族元素的含氧化合物与多种有机碱类的相互作用,试建立Lewis酸性的固体模型,探讨复相酸碱反应的机理。硼酸在室温是一种稳定的固体酸,在水溶液中的酸性来源于水中OH-离子在中心硼原子上的配位,而不是硼酸分子自身解离给出质子。这显示了典型的Lewis酸性。固体硼酸也可能成为一个Lewis酸的固体模型。

关键词: 三氟化硼, 五氯化锑, Lewis酸性模型物, 润温热, 吸附热

Abstract: The heats of immersion of orthoboric acid in twelve organic bases and the adsorption heats of nine organic bases on γ-alumina were determined. The heat values were correlated with the corresponding enthalpies of boron trifluoride and antimony penta chloride, the well-known homogeneous prototype of Lewis acid. The results show that the heats of immersion of H3BO3 appear to be well correlated with the thermochemical measurements of BF3 and SbCl5 (correlation coefficient are 0.98 and 0.97 respectively), but the correlation coefficient for the adsorption heats of γ-Al2O3 and the two homogeneous prototype of Lewis acid are only 0.95 and 0.92 respectively. It is concluded that the reaction of orthoboric acid with the organic bases is an essential Lewis acid-base interaction and the orthoboric acid could be used as a solid prototype of Lewis acid.

Key words: boron trifluoride, antimony pentachloride, solid model of Lewis acidity, heat of immersion, adsorption heat

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