Niobium(V) chloride



Niobium(V) chloride
Systematic name Niobium(V) chloride
Niobium pentachloride
Molecular formula NbCl5
Molar mass 270.17 g/mol
Density 2.75 g/cm3
water) Decomposes
dimethylformamide) Good
Melting point 204.7 °C
Boiling point 254 °C
CAS number [10026-12-7]
EINECS number 233-059-8
Thermodynamic data
Standard enthalpy
of formation ΔfH°solid 		-797.47 kJ/mol
Standard molar entropy
S°solid 		214.05 J.K−1.mol−1
Safety data
EU classification not listed
Flash point non-flammable
RTECS number QU0350000
Related compounds
Related chlorides Vanadium(IV) chloride
Tantalum(V) chloride
Disclaimer and references

Niobium(V) chloride, also known as niobium pentachloride, is a yellow crystalline solid often used as a starting material in sublimation.

Structure and properties

Niobium(V) chloride forms chloro-bridged dimers in the solid state (see figure). Each niobium centre is six-coordinate, but the octahedral coordination is significantly distorted. The niobium–chlorine TaCl5 and TaBr5 are isostructural with NbCl5, but NbI5 and TaI5 have different structures.

Uses

Niobium(V) chloride is used in benzophenone[1].

Bibliography

  • Wilkinson, Geoffrey (1980). Advanced Inorganic Chemistry (4th Edn.). New York:Wiley. ISBN 0-471-02775-8. 

References

  1. ^  Andrade, C. K. Z.; Rocha, R. O.; Russowsky, D.; & Godoy, M. N. (2005). Studies on the Niobium Pentachloride-Mediated Nucleophilic Additions to an Enantiopure Cyclic N-acyliminium Ion Derived from (S)-malic acid. J. Braz. Chem. Soc. 16: 535–539. Online Article (.PDF file)
 
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