Tantalum(V) Iodide
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Tantalum V Iodide
Tantalum(V) iodide
Other names
Tantalum pentaiodide
  • 14693-81-3 TaI5
  • 26814-38-0 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(V) iodide is the inorganic compound with the formula Ta2I10. Its name comes from the compound's empirical formula, TaI5.[1] It is a diamagnetic, black solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral structure, which means that two TaI5 units are joined by a pair of iodide bridges. There is no bond between the Ta centres.[2] Niobium(V) chloride, niobium(V) bromide, niobium(V) iodide, tantalum(V) chloride, and tantalum(V) bromide all share this structural motif.

Synthesis and structure

Tantalum pentaiodide forms from the reaction of tantalum pentoxide with aluminium triiodide:[3]

Ta2O5 + 3.3 AlI3 -> 2 TaI5 + 3.3 Al2O3


  1. ^ Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford: Butterworth-Heinemann. ISBN 0-7506-3365-4.
  2. ^ Müller, U. (1979). "Die Kristallstruktur von Tantalpentajodid und ihre Fehlordnung". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 35 (11): 2502-2509. doi:10.1107/S0567740879009778.
  3. ^ G. Braurer (1963). "Niobium(V) and Tantalum(V) Bromides". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. 1. NY, NY: Academic Press. p. 1311.

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