Niobium (IV) iodide

Crystal structure
	__ Nb 4+ __ I -
General
Surname	Niobium (IV) iodide
other names	Niobium tetraiodide
Ratio formula	NbI 4
Brief description	gray solid
External identifiers / databases
Wikidata	Q18212034
properties
Molar mass	600.52 g mol −1
Physical state	firmly
density	5.6 g cm −3
Melting point	503 ° 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 .

Niobium (IV) iodide is a chemical compound of niobium from the group of iodides .

Extraction and presentation

Niobium (IV) iodide can be obtained by decomposing niobium (V) iodide at 206 to 270 ° C in a vacuum.

properties

Niobium (IV) iodide is a gray solid that reacts with water

It has an orthorhombic crystal structure with the space group Cmc 2 ₁ (space group no. 36) . The structure consists of chains of edge-sharing NbI ₆ octahedra, which are characterized by the formation of Nb ₂ groups with an Nb – Nb bond. At temperatures above 348 and 417 ° C, the transformation to another crystal structure takes place. At very high pressures it changes into a metallic structure. Template: room group / 36

Individual evidence

↑ ^a ^b ^c ^d ^e William M. Haynes: CRC Handbook of Chemistry and Physics, 97th Edition . CRC Press, 2016, ISBN 978-1-4987-5429-3 , pp. 76 ( 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.
^ Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2016, ISBN 978-1-4398-1462-8 , pp. 298 ( limited preview in Google Book search).
↑ LF Dahl, DL Wampler: The crystal structure of α-niobium tetraiodide. In: Acta Crystallographica. 15, 1962, p. 903, doi : 10.1107 / S0365110X62002340 .
^ Viktor Gutmann: Halogen Chemistry . Elsevier, 2012, ISBN 0-323-14847-6 , pp. 170 ( limited preview in Google Book search).
↑ H. Kawamura, N. Matsui, I. Nakahata, M. Kobayashi, Y. Akahama, I. Shirotani: Structural studies of NbI ₄ at high pressures. In: Solid State Communications. 108, 1998, p. 919, doi : 10.1016 / S0038-1098 (98) 00483-9 .

[William_M._Haynes-1] William M. Haynes: CRC Handbook of Chemistry and Physics, 97th Edition . CRC Press, 2016, ISBN 978-1-4987-5429-3 , pp. 76 ( limited preview in Google Book search).

[NV-2] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Dale_L._Perry-3] Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . CRC Press, 2016, ISBN 978-1-4398-1462-8 , pp. 298 ( limited preview in Google Book search).

[DOI10.1107/S0365110X62002340-4] LF Dahl, DL Wampler: The crystal structure of α-niobium tetraiodide. In: Acta Crystallographica. 15, 1962, p. 903, doi : 10.1107 / S0365110X62002340 .

[Viktor_Gutmann-5] Viktor Gutmann: Halogen Chemistry . Elsevier, 2012, ISBN 0-323-14847-6 , pp. 170 ( limited preview in Google Book search).

[DOI10.1016/S0038-1098(98)00483-9-6] H. Kawamura, N. Matsui, I. Nakahata, M. Kobayashi, Y. Akahama, I. Shirotani: Structural studies of NbI ₄ at high pressures. In: Solid State Communications. 108, 1998, p. 919, doi : 10.1016 / S0038-1098 (98) 00483-9 .