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Published January 1970 | public
Journal Article

Electronic Energy Levels in Hexahalotellurate (IV) Complexes

Abstract

The electronic spectra of the octahedral Tecl_6^(2-) and TeBr+6^(2-) complexes are reported and assigned. The s → p transition a_(lg)σ^* → t_(lu)σ^* gives rise to three spin-allowed bands in TeCl_6^(2-) (32,880; 34,480; 35,680 cm^(-1)) and TeBr_6^(2-) (28,470; 29,730; 30,850 cm^(-1)). These data are taken as evidence that the excited singlet states are distorted to lower symmetry, probably C_(2v). The lowest allowed halide → Te(IV) charge transfer transitions are at 44,170 cm^(-1) and somewhat higher than 52,000 cm^(-1) in TeCl_6^(2-); analogous transitions appear at 37,000 and 42,600 cm^(-1) in TeBr_6^(2-). The observed spectral data indicate that the "inert" 5s^2 Te(IV) electrons, which reside in the a_(lg)σ^* level, are partially delocalized to the halide ligands.

Additional Information

© 1970 American Chemical Society. The authors acknowledge financial support from the Selenium-Tellurium Development Association, New York. This study was also supported by the National Science Foundation. One of us (H. B. G.) is grateful to the University of Canterbury, New Zealand, for an Erskine Fellowship which made possible his participation in this research.

Additional details

Created:
August 23, 2023
Modified:
October 26, 2023