Niobium oxychloride
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Names | |
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IUPAC name
Niobium (V) Oxychloride
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Other names
Niobium oxytrichloride
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Identifiers | |
3D model (
JSmol ) |
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PubChem CID
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Properties | |
Cl3NbO | |
Molar mass | 215.26 g·mol−1 |
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 [77 °F], 100 kPa).
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Niobium oxychloride is the
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.[1][2]
In the gas phase above 320 °C the Raman spectrum is consistent with a pyramidal monomer containing a niobium–oxygen double bond.[3]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/39/Niobium-oxytrichloride-3D-balls.png/120px-Niobium-oxytrichloride-3D-balls.png)
Synthesis
Niobium oxychloride is prepared by treating the pentachloride with oxygen:[4]
- 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.[4][5]
- 2 Nb2O5 + 6 CCl4 → 4 NbOCl3 + 6 COCl2
References
- .
- .
- ISBN 9780851860237.
- ^ a b G. Brauer (1963). "Niobium Oxytrichloride". In Brauer, G. (ed.). Handbook of Preparative Inorganic Chemistry. Vol. 2 (2nd ed.). New York: Academic Press. p. 1307.
- S2CID 98226151..