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ChemInform Abstract: Crystal Structures of Potassium Tetratellurite, K2Te4O9, and Potassium Ditellurite, K2Te2O5, and Structural Trends in Solid Alkali Tellurites.

✍ Scribed by C. R. BECKER; S. L. TAGG; J. C. HUFFMAN; J. W. ZWANZIGER

Publisher
John Wiley and Sons
Year
2010
Weight
33 KB
Volume
29
Category
Article
ISSN
0931-7597

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✦ Synopsis

The structures of K 2 Te 4 O 9 (I) and K 2 Te 2 O 5 (II), prepared from the melts, are determined by single-crystal XRD methods and compared to that of the known Li, Na, K, and Cs tellurites. (I) (monoclinic, P2 1 /c, Z = 4) is built-up from linked 12-membered tellurite rings, coordinated by potassium. In (II) (P2 1 /c, Z = 4) infinite chains of [Te 2 O 5 ] 2-are separated by corrugated sheets of K + cations. In the new structures, K acts like a conventional modifier inducing nonbridging oxygen. The cleavage of the tellurite network by the alkali oxide significantly depends on the nature of the modifier. Li induces the fewest nonbridging oxygens, whereas K and Cs induce two nonbridging oxygens per equivalent of added cations. This behavior, which is different from that of silicate modification, is attributed to delocalized electrons across several nonbridging oxygens.

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