Tantalum(V) iodide

Tantalum(V) iodide
Names
	Other names Tantalum(V) iodide
Identifiers
CAS Number	14693-81-3 TaI5; 26814-38-0 Ta2I10;
Properties
Chemical formula	Ta2I10
Molar mass	1631
Appearance	black solid
Density	5.8 g/cm3
Melting point	543 °C (1,009 °F; 816 K) sublimes
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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:^[1]

{\ce {{3Ta2O5}+ 10AlI3 -> {3Ta2I10}+ 5Al2O3}}

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.^[2]

References

^ 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.
^ U. Müller "Die Kristallstruktur von Tantalpentajodid und ihre Fehlordnung" Acta Crystallographica Section B 1979, volume 35, pp. 2502-9. doi:10.1107/S0567740879009778

[1] 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.

[2] U. Müller "Die Kristallstruktur von Tantalpentajodid und ihre Fehlordnung" Acta Crystallographica Section B 1979, volume 35, pp. 2502-9. doi:10.1107/S0567740879009778

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