COMPLEX HALIDES OF TRANSITION METALS .8. A COMPARATIVE STUDY OF ELECTRONIC ABSORPTION SPECTRA OF ZRX62- HFX62- NBX6- AND TAX6- ANIONS

被引:13
作者
BRISDON, BJ
FOWLES, GWA
TIDMARSH, DJ
WALTON, RA
机构
[1] Department of Chemistry, Bath University of Technology, Claverton Down
[2] Department of Chemistry, university of Reading, Whiteknights Park Reading
来源
SPECTROCHIMICA ACTA PART A-MOLECULAR SPECTROSCOPY | 1969年 / A 25卷 / 05期
关键词
D O I
10.1016/0584-8539(69)80075-9
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
The diffuse-reflectance and solution spectra (in acetonitrile) of salts of the HfX62- (X = Cl or Br), NbX6- and TaX6- (X = Cl, Br or I) anions are reported. Absorption bands associated with the halogen (π) → metal (γ5g) transitions are assigned and, in particular, the spectra of the pairs ZrX62- and HfX62-, and NbX-6 and TaX-6 are compared. The optical electronegativity parameter xopt has been calculated for Hf(IV), Nb(V) and Ta(V)-1·54, 1·94 and 1·84, respectively. Spectral data for the NbCl6- anion is used as further support for earlier spectral assignments for the MoCl-6 anion. The diffuse-reflectance spectra of the methyl cyanide adducts HfX4·2CH3CN (X = Cl or Br) are also described. © 1969.
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页码:999 / &
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