Polytellurium cations

About the same time, solutions of tellurium in various acids were investigated in detail919 920 It was found that the red solutions are produced when tellurium is dissolved in sulfuric acid, fluorosulfuric acid, or oleum with the simultaneous production of S02, indicating that tellurium is oxidized. The electronic spectra of the solutions were found to be identical with those obtained by Bjerrum and Smith from their melts. Conductometric and cryoscopic measurements of the acid solutions led to the conclusion that they contain a species Te2 +, which was certainly not Te2+ but probably Te42+ 346. 

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Further information of the chemistry of polysulfur, polyselenium, and polytellurium cations can be found in reviews.773 776,876,898 899... 

Aluminum forms a complete series of AlYX compounds (Y = S, Se, Te X = Cl, Br, I). Furthermore, a number of compounds with Se(IV) and Te(IV) are known, such as TeClJ AlClj (197) and SeCl AICI4 (364), which are not considered here. A borderline case consists in the reduced phases found in the systems (TeCl4-l-4AlCl3)-Te and (SeCl4 + 4A1C13)-Se (88), e.g., Te (AlClr) (89), T + (AUClf) (89), Te + (AICID3 (88), Se (AlClr) (88), and Se + (AICID (87), which contain cyclic polytellurium and polyselenium cations. For a detailed review of homopoly atomic ions of the posttransition elements, see (86). 

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