Organoniobium chemistry
Organoniobium chemistry is the chemistry of compounds containing niobium-carbon (Nb-C) bonds. Organoniobium compounds often have niobium in the oxidation state +5. A convenient starting material is niobium(V) chloride. Organoniobium(V) compounds are often strongly oxophilic. Organoniobium and organotantalum chemistry are similar, except that the tantalum compounds are more resistant to reduction.
Fundamental compounds
Niobocene dichloride ((C5H5)2NbCl2), a metallocene, is a derivative of Nb(IV).[1] It oxidizes in air to give the oxychloride Cp2NbOCl, a Nb(V) derivative, and correspondingly diamagnetic. Derivatives of pentamethylcyclopentadiene are also known, such as (C5Me5)2NbH3.
The anion [Nb(CO)6]− is the simplest carbonyl of niobium. It is obtained by reduction of NbCl5 under an atmosphere of CO using sodium-potassium alloy.[2]
References
- ^ C. R. Lucas (1990). "Dichlorobis(η5-Cyclopentadienyl)Niobium(IV)". Inorg. Synth. 28: 267–270. doi:10.1002/9780470132593.ch68. ISBN 0-471-52619-3.
- ^ "Tris[Bis(2-Methoxyethyl)Ether]Potassium and Tetraphenylarsonium Hexacarbonylmetallates(1–) of Niobium and Tantalum". Inorg. Synth. 16: 68–73. 1976. doi:10.1002/9780470132470.ch21.
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