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Metatellurate ion

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The paper Tetrahedral Tellurate, Saki Konaka, Yoshiki Ozawa and Atsushi Yagasaki Inorg. Chem., 2008, 47 (4), pp 1244–1245, DOI: 10.1021/ic701578p claims to be the first example of a discrete tetrahedral tellurate, namely tetraethylammonium tellurate dihydrate. There is at least one other example with tetrahedral TeO42-, Rb6Te2O9 which contains both tetrahedral and pentagonal bipyramidal tellurate(VI) ions. Most salts such as Na2TeO4 contain the chain anion with 6 coordinate Te. The comment regarding double bonded Te-O is probably misplaced as it implies p-d pi bonds, the situation is probably more like that of sulfate with resonance making the 4 bonds equivalent and little or no d orbital participation. Axiosaurus (talk) 16:23, 12 April 2013 (UTC)[reply]