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Tantalum pentaiodide : ウィキペディア英語版
Tantalum pentaiodide

Tantalum pentaiodide is the inorganic compound with the formula Ta2I10. It is a black, moisture-sensitive, diamagnetic solid.
==Synthesis and structure==
Tantalum pentaiodide forms from the reaction of metallic tantalum with excess iodine. It can also be prepared by heating tantalum pentoxide with aluminium triiodide:〔G. Brauer "Hydrogen, Deuterium, Water" in Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 2. p. 1316.〕
:3 Ta2O5 + 10 AlI3 → 3 Ta2I10 + 5 Al2O3
Its structure has been verified by X-ray crystallography, which reveals an edge-shared bioctahedral structure, as observed for many pentahalides of Nb and Ta.〔U. Müller "Die Kristallstruktur von Tantalpentajodid und ihre Fehlordnung" Acta Crystallographica, Section B 1979, volume 35, pp. 2502-9. 〕

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