Tantalum (IV) iodide

Crystal structure
	__ Ta 4+ __ I -
General
Surname	Tantalum (IV) iodide
other names	Tantalum triiodide
Ratio formula	TaI 4
Brief description	black solid
External identifiers / databases
Wikidata	Q15632854
properties
Molar mass	688.57 g mol −1
Physical state	firmly
Melting point	398 ° C
solubility	reacts with water
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Tantalum (IV) iodide is an inorganic chemical compound of tantalum from the group of iodides .

Extraction and presentation

Tantalum (IV) iodide can be obtained by reacting tantalum (V) iodide with aluminum , magnesium or calcium at 380 ° C. This also creates Ta ₆ I ₁₄ as a stable soil body . The preparation of a very pure crystallized tantalum (IV) iodide is therefore difficult.

{\ displaystyle \ mathrm {3 \ TaI_ {5} + Al \ longrightarrow 3 \ TaI_ {4} + AlI_ {3}}}

properties

Tantalum (IV) iodide is a black solid. It has a crystal structure isotypic to that of niobium (IV) iodide . Monocrystalline tantalum (IV) iodide was first obtained in 2008 from Rafal Wiglusz and Gerd Meyer as a chance product of a conversion in a tantalum ampoule, which should actually lead to the product Rb (Pr ₆ C ₂ ) I ₁₂ . The single crystal has a triclinic crystal structure with the space group P 1 (space group no.2 ) with two formula units per unit cell (a = 707.36 pm, b = 1064.64 pm, c = 1074.99 pm, α = 100.440 °, β = 89.824 ° and γ = 104.392 °). The crystal structure is different from that of other Übergangsmetalltetraiodide who usually a MI _2.4 I _2.1 have -Kettenstruktur as they made TaI ₆ - octahedra is bridged by a common surface to form a dimer. Two such dimers bridge a common edge to form a tetramer . Template: room group / 2

Individual evidence

↑ ^a ^b ^c ^d ^e Georg Brauer: Handbook of preparative inorganic chemistry . 3., reworked. Edition. tape III . Enke, Stuttgart 1981, ISBN 3-432-87823-0 , pp. 1455 .
↑ WM Haynes (Ed.): CRC handbook of chemistry and physics. A ready-reference book of chemical and physical data . founded by David R. Lide. 93rd edition. CRC Press, Boca Raton 2012, ISBN 978-1-4398-8049-4 , pp. 4–93 (English, limited preview in Google Book Search).
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ Gerd Meyer, Rafal Wiglusz, Ingo Pantenburg, Anja-Verena Mudring: Tantalum (IV) Iodide, TaI4: A Molecular Solid Consisting of Dimers of Dimers, Ta4I16. In: Journal of Inorganic and General Chemistry. 634, 2008, pp. 825-828, doi : 10.1002 / zaac.200700529 .
↑ Katja Habermehl; New studies on halides of niobium and tantalum (PDF; 3.9 MB), urn : nbn: de: hbz: 38-31032 , April 22, 2010.

[brauer-1] Georg Brauer: Handbook of preparative inorganic chemistry . 3., reworked. Edition. tape III . Enke, Stuttgart 1981, ISBN 3-432-87823-0 , pp. 1455 .

[W._M._Haynes,_David_R._Lide,_Thomas_J._Bruno-2] WM Haynes (Ed.): CRC handbook of chemistry and physics. A ready-reference book of chemical and physical data . founded by David R. Lide. 93rd edition. CRC Press, Boca Raton 2012, ISBN 978-1-4398-8049-4 , pp. 4–93 (English, limited preview in Google Book Search).

[NV-3] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[DOI10.1002/zaac.200700529-4] Gerd Meyer, Rafal Wiglusz, Ingo Pantenburg, Anja-Verena Mudring: Tantalum (IV) Iodide, TaI4: A Molecular Solid Consisting of Dimers of Dimers, Ta4I16. In: Journal of Inorganic and General Chemistry. 634, 2008, pp. 825-828, doi : 10.1002 / zaac.200700529 .

[5] Katja Habermehl; New studies on halides of niobium and tantalum (PDF; 3.9 MB), urn : nbn: de: hbz: 38-31032 , April 22, 2010.