Misplaced Pages

Niobium oxychloride

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Niobium oxychloride
Names
IUPAC name Niobium (V) Oxychloride
Other names Niobium oxytrichloride
Identifiers
CAS Number
3D model (JSmol)
PubChem CID
SMILES
  • O=(Cl)(Cl)Cl
Properties
Chemical formula Cl3NbO
Molar mass 215.26 g·mol
Appearance white crystals
Melting point sublimes above 200 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

Niobium oxychloride is the inorganic compound with the formula NbOCl3. It is a white, crystalline, diamagnetic solid. It is often found as an impurity in samples of niobium pentachloride, a common reagent in niobium chemistry.

Structure

In the solid state the coordination sphere for niobium is a distorted octahedron. The Nb–O bonds and Nb–Cl bonds are unequal. This structure can be described as planar Nb2Cl6 core connected by O–Nb–O bridges. In this way, the compound is best described as a polymer, consisting of a double stranded chain.

In the gas phase above 320 °C the Raman spectrum is consistent with a pyramidal monomer containing a niobium–oxygen double bond.

Gaseous NbOCl3 is a tetrahedral molecule.

Synthesis

Niobium oxychloride is prepared by treating the pentachloride with oxygen:

NbCl5 + ⁠1/2⁠ O2 → NbOCl3 + Cl2

This reaction is conducted at about 200 °C. NbOCl3 also forms as a major side-product in the reaction of niobium pentoxide with various chlorinating agents such as carbon tetrachloride and thionyl chloride.

2 Nb2O5 + 6 CCl4 → 4 NbOCl3 + 6 COCl2

References

  1. Ströbele, Markus; Meyer, Hans-Jürgen (2002). "Neubestimmung der Kristallstruktur von NbOCl3". Zeitschrift für anorganische und allgemeine Chemie. 628 (2): 488–491. doi:10.1002/1521-3749(200202)628:2<488::AID-ZAAC488>3.0.CO;2-B.
  2. Beck, Johannes; Bordinhão, Jairo (2005). "Polar 2n and n (X = Cl, Br) Chains in the Structures of NbOCl3 and the Thallium-Halogenooxoniobates Tl and Tl — Synthesis, Crystal Structures and Optical Second Harmonic Generation". Zeitschrift für anorganische und allgemeine Chemie. 631 (6–7): 1261–1266. doi:10.1002/zaac.200500041.
  3. Greenwood, N. N. (January 1, 1970). "Chapter 5: Vibrational Spectra". Spectroscopic Properties of Inorganic and Organometallic Compounds. Royal Society of Chemistry. p. 196. ISBN 9780851860237.
  4. ^ G. Brauer (1963). "Niobium Oxytrichloride". In Brauer, G. (ed.). Handbook of Preparative Inorganic Chemistry. Vol. 2 (2nd ed.). New York: Academic Press. p. 1307.
  5. Jena, P. K.; Brocchi, E. A.; Garcia, R. I. (1997). "Kinetics of chlorination of niobium pentoxide by carbon tetrachloride". Metallurgical and Materials Transactions B. 28 (1): 39–45. Bibcode:1997MMTB...28...39J. doi:10.1007/s11663-997-0125-0. S2CID 98226151..
Niobium compounds
Niobium(II)
Niobium(III)
Niobium(IV)
Niobium(V)
Organoniobium(V)
Categories: