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 | |
| Properties | |
| Cl3NbO | |
| Molar mass | 215.26 g·mol−1 |
| Appearance | white crystals |
| Melting point | sublimes above 200 °C |
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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 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.
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.
Niobium oxychloride is prepared by treating the pentachloride with oxygen:
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.
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