应用化学 ›› 1991, Vol. 0 ›› Issue (4): 11-15.

• 研究论文 • 上一篇    下一篇

PMo12-xVx和PMo12-xWx杂多酸的XPS研究 Ⅰ.杂多酸中氧的俄歇谱

胡刚, 于亚莉   

  1. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:1990-02-05 修回日期:1990-12-14 出版日期:1991-08-10 发布日期:1991-08-10

X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF HETEROPOLYACIDS PMo12-xVx AND PMo12-xWx Ⅰ.AUGER SPECTRA OF OXYGEN

Hu Gang, Yu Yali   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1990-02-05 Revised:1990-12-14 Published:1991-08-10 Online:1991-08-10

摘要: 用XPS对杂多酸PMo12-x Vx和PMo12-x Wx的研究表明:在用V部分取代Mo时,虽然O1s峰没有给出什么有意义的结构信息,但OKL23L23俄歇跃迁动能随X增大而增大;在W部分取代Mo时,OKL23L23俄歇峰的动能随X增大而减少。杂多酸中酸性与OKL23L23数值有一定的关系。从OKL1L1与OKL23L23俄歇峰强度之比,求出氧成键时增加电荷,进一步表明了杂多酸中氧原子成键情况。

关键词: 杂多酸, 氧的俄歇峰, 磷钼酸, 磷钨酸, X-射线光电子能谱

Abstract: The Auger spectra of PMo12-x Vx and PMo12-xWx have been studied.A relationshipbetween OKL23L23 spectra and electron densities of oxygen in these heteropolyacids(HPA)was observed.It is found that the mobility of protons in HPA depends mainly upon thenegative charge of the oxygen atoms; the larger the kinetic energy for OKL23L23, i.e.thelarger the magnitude of the negative charge on the oxygen atoms, the stronger the bindingenergy to proton, and the smaller the proton mobility and hence the less acidity.InPMo12-xVx the kinetic energy of OKL23L23 increases with the increase of x value, but itdecreases with the increase of x in PMo12-xWx.The acidity of HPA is inversely related tothe kinetic energy of O KL23L23 Auger transition.

Key words: heteropolyacid, Auger spectrun of oxygen, P-Mo-heteropolyacids, P-W-heteropolyscid, X-ray photoelectron spectroscopy