取代环戊二烯钛、锆、铪络合物的XPS及其价带谱研究

XPS and Their Valence Band Spectra Studies of the substituted Titanocene, Zirconocene and Hafnocene Dichloride Complexes

本文研究取代环戊二烯钛,锆,铪络合物的XPS及其价带谱。分析了在环戊二烯配体上,甲基,乙基,丙基……等取代基在其内壳谱上产生的戏剧性的电子效应。探讨了它们的XPS价带谱中由具最低结合能峰峰位所确定的“电离势”与环戊二烯配体中不同取代基间的关系,指出不同过渡金属元素化合物的价带谱是其金属元素的表征。同时发现不同烧基取代的环戊二烯钛的价带谱中,位于25eV附近的第三峰的相对强度明显增大,这反映为甲基基团在配体中增大的相对权重。

This paper reports a detailed XPS and their valence hand spectra studies for the substitution of alkyl for hydrogens on the cyclopentadienyl ligand. It have been shown that the substituted of CH_3, C_2H_5, C_3H_7, C_5H_(11), C_6H_(11) on the cyclopentadienyl ligand result in a dramatic electronic effect. The relation between the ditermined 'Ionization energy' from the lowest ionization energy peak of XPS valence band spectra and the various substitutive groups of the cyclopentatienyl ligand is discussed. And then it have also shown that XPS valence band spectra of the different trasition metal element compounds are their character of the metal elements. We have found that the intensity of third peak near 25eV ionization energy increase obviously in their XPS valence band spectra of the substituted titanocenes, this reflects the relativity increased weight of methyl in the ligand.