Niobium (V) iodide

Crystal structure
	__ Nb 5+ __ I -; crystal structure of triclinic niobium (V) iodide
General
Surname	Niobium (V) iodide
other names	Niobium pentaiodide
Ratio formula	NbI 5
Brief description	brass colored solid
External identifiers / databases
EC number	237-422-1
ECHA InfoCard	100.034.006
Wikidata	Q4202659
properties
Molar mass	727.43 g mol −1
Physical state	firmly
density	5.32 g cm −3
Melting point	327 ° C
boiling point	346 ° C
solubility	reacts with water
safety instructions
GHS labeling of hazardous substances danger
H and P phrases	H: 314
	P: 260-303 + 361 + 353-305 + 351 + 338-301 + 330 + 331-405-501
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Niobium (V) iodide is an inorganic chemical compound of niobium from the group of iodides .

Extraction and presentation

Niobium (V) iodide can be obtained by reacting niobium with iodine .

{\ displaystyle \ mathrm {2 \ Nb + 5 \ I_ {2} \ longrightarrow 2 \ NbI_ {5}}}

properties

Niobium (V) iodide is in the form of dark, shiny brass needles or leaves that are extremely sensitive to moisture. Its crystal structure is monoclinic with the space group P 2 ₁ / c (space group no. 14) , a = 1058 pm , b = 658 pm, c = 1388 pm, β = 109.14 °. The crystal structure consists of zigzag chains of corner-sharing NbI ₆ octahedra. Since so far only twinned crystals of this phase could be obtained, the structure determination is uncertain. If the reaction is carried out from the elements with an excess of iodine, a triclinic modification with the space group P 1 (No. 2) , a = 759.1 pm, b = 1032.2 pm, c = 697.7 pm, α = results 90.93 °, β = 116.17 °, γ = 109.07 °, which consists of isolated molecules Nb ₂ I ₁₀ . This structure is isotypic with that of triclinic niobium (V) bromide . Template: room group / 14Template: room group / 2

Individual evidence

↑ ^a ^b ^c ^d ^e Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1450.
^ ^A ^b Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 632 ( limited preview in Google Book search).
↑ ^a ^b ^c Datasheet Niobium (V) iodide from AlfaAesar, accessed on June 20, 2013 ( PDF )(JavaScript required) .
^ W. Littke, G. Brauer: Representation and crystal structure of Niobpentajodid . In: Journal for inorganic and general chemistry , 1963 , 325 , pp. 122-129 ( doi : 10.1002 / zaac.19633250304 ).
↑ B. Krebs, D. Sinram: Presentation, structure and properties of a new modification of NbI ₅ . In: Zeitschrift fur Naturforschung, Part B. Inorganic Chemistry, Organic Chemistry , 1980 , 35 , pp. 12-16.

[brauer-1] Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1450.

[Jean_d’Ans,_Ellen_Lax,_Roger_Blachnik-2] A ^b Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 632 ( limited preview in Google Book search).

[Alfa-3] Datasheet Niobium (V) iodide from AlfaAesar, accessed on June 20, 2013 ( PDF )(JavaScript required) .

[4] W. Littke, G. Brauer: Representation and crystal structure of Niobpentajodid . In: Journal for inorganic and general chemistry , 1963 , 325 , pp. 122-129 ( doi : 10.1002 / zaac.19633250304 ).

[5] B. Krebs, D. Sinram: Presentation, structure and properties of a new modification of NbI ₅ . In: Zeitschrift fur Naturforschung, Part B. Inorganic Chemistry, Organic Chemistry , 1980 , 35 , pp. 12-16.