Niobium pentaiodide

Source: Wikipedia, the free encyclopedia.
Niobium pentaiodide
Names
Other names
Niobium(V) iodide
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.034.006 Edit this at Wikidata
EC Number
  • 237-422-1
UNII
  • InChI=1S/5HI.Nb/h5*1H;/q;;;;;+5/p-5
    Key: FWIYBTVHGYLSAZ-UHFFFAOYSA-I
  • [Nb](I)(I)(I)(I)I
Properties
Nb2I10
Molar mass 1475
Appearance yellow solid
Density 5.30 g/cm3
Melting point 543 °C (1,009 °F; 816 K) sublimes
Hazards
GHS labelling:
GHS05: Corrosive
Danger
H314
P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Niobium pentaiodide is the inorganic compound with the formula Nb2I10. Its name comes from the compound's empirical formula, NbI5.[1] It is a diamagnetic, yellow solid that hydrolyses readily. The compound adopts an edge-shared bioctahedral structure, which means that two NbI5 units are joined by a pair of iodide bridges. There is no bond between the Nb centres.[2] Niobium(V) chloride, niobium(V) bromide, tantalum(V) chloride, tantalum(V) bromide, and tantalum(V) iodide, all share this structural motif.

Preparation

Niobium pentaiodide forms from the reaction of niobium with iodine:

2 Nb + 5 I2 → 2 NbI5

The method used for the preparation of tantalum(V) iodide using

aluminium triiodide fails to produce pure pentaiodide.[3]

Properties

Niobium(V) iodide forms of dark, brassy, extremely moisture-sensitive needles or flakes. Its crystallises in the

triclinic modification is created with the space group P1 (No. 2), a = 759.1 pm, b = 1032.2 pm, c = 697.7 pm, α = 90 .93°, β = 116.17°, γ = 109.07°, which consists of isolated molecules Nb2I10.[3][5]
This structure is isotypic with that of triclinic niobium(V) bromide.

References

  1. ISBN 0-7506-3365-4
    .
  2. ^ Krebs, Bernt; Sinram, Diethard "Darstellung, Struktur und Eigenschaften einer neuen Modifikation von NbI5 (Preparation, structure and properties of a new modification of NbI5" Zeitschrift fǔr Naturforschung, Teil B: Anorganische Chemie, Organische Chemie 1980, volume 35b, pp. 12-16.
  3. ^ a b G. Braurer (1963). "Niobium(V) Iodide". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1. NY, NY: Academic Press. p. 1315.
  4. ISSN 0044-2313
    .
  5. ^ B. Krebs, D. Sinram: Darstellung, Struktur und Eigenschaften einer neuen Modifikation von NbI5. In: Zeitschrift fuer Naturforschung, Teil B. Anorganische Chemie, Organische Chemie, 1980, 35, S. 12–16.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Niobium_pentaiodide&oldid=1176387194"