nitrosonium tetrafluoroborate
{{Chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 424305424
| ImageFile = Nitrosonium-tetrafluoroborate-2D.png
| IUPACName = nitrosonium tetrafluoroborate
| OtherNames = nitrosyl tetrafluoroborate
|Section1={{Chembox Identifiers
| CASNo_Ref = {{cascite|correct|??}}
| CASNo = 14635-75-7
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = B99S282SUJ
| PubChem = 151929
| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}
| ChemSpiderID = 9312255
| SMILES = [B-](F)(F)(F)F.N#[O+]
| StdInChI_Ref = {{stdinchicite|changed|chemspider}}
| StdInChI = 1S/BF4.NO/c2-1(3,4)5;1-2/q-1;+1
| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}
| StdInChIKey = KGCNVGDHOSFKFT-UHFFFAOYSA-N }}
|Section2={{Chembox Properties
| N=1 | O=1 | B=1 | F=4
| Appearance = colourless crystalline solid
| Density = 2.185 g cm−3
| MeltingPtC = 250
| MeltingPt_notes = (sublimes)
| Solubility = decomposes}}
}}
Nitrosonium tetrafluoroborate, also called nitrosyl tetrafluoroborate, is a chemical compound with the chemical formula NOBF4. This colourless solid is used in organic synthesis as a nitrosating agent, diazotizing agent and a mild oxidant.{{Citation |last=Olah |first=George A. |title=Nitrosonium Tetrafluoroborate |date=2004-10-15 |work=Encyclopedia of Reagents for Organic Synthesis |editor-last=John Wiley & Sons, Ltd |url=https://onlinelibrary.wiley.com/doi/10.1002/047084289X.rn058.pub2 |access-date=2024-11-27 |place=Chichester, UK |publisher=John Wiley & Sons, Ltd |language=en |doi=10.1002/047084289x.rn058.pub2 |isbn=978-0-471-93623-7 |last2=Surya Prakash |first2=G. K. |last3=Wang |first3=Qi |last4=Li |first4=Xing-ya |last5=Surya Prakash |first5=G. K. |last6=Hu |first6=Jinbo|url-access=subscription }}
NOBF4 is the nitrosonium salt of fluoroboric acid, and is composed of a nitrosonium cation, [NO]+, and a tetrafluoroborate anion, [BF4]−.{{Cite journal |last=Lozinšek |first=Matic |date=2021-11-28 |title=Nitrosonium tetrafluoridoborate, NOBF4 |url=https://scripts.iucr.org/cgi-bin/paper?S2414314621012153 |journal=IUCrData |volume=6 |issue=11 |doi=10.1107/S2414314621012153 |issn=2414-3146 |pmc=9462292 |pmid=36337464}}
Reactions
The dominant property of NOBF4 is the oxidizing power and electrophilic character of the nitrosonium cation. It forms colored charge transfer complexes with hexamethylbenzene and with 18-crown-6. The latter, a deep yellow species, provides a means to dissolve NOBF4 in dichloromethane.{{cite journal |doi=10.1021/ic00346a008|title=Redox equilibria of the nitrosonium cation and of its nonbonded complexes|year=1990|last1=Lee|first1=K. Y.|last2=Kuchynka|first2=D. J.|last3=Kochi|first3=Jay K.|journal=Inorganic Chemistry|volume=29|issue=21|pages=4196–4204}}
Nitrosonium tetrafluoroborate may be used to prepare metal salts of the type [MII(CH3CN)x][BF4]2 (M = Cr, Mn, Fe, Co, Ni, Cu). The nitrosonium cation acts as the oxidizer, itself being reduced to nitric oxide gas:{{cite journal | doi = 10.1002/0471224502.ch2 | journal = Inorg. Synth. | volume = 33 | pages = 75–83 | title = 11. Homoleptic Transition Metal Acetonitrile Cations with Tetrafluoroborate or Trifluoromethanesulfonate Anions | first1=Robert A. | last1=Heintz | first2=Jennifer A. | last2=Smith | first3=Paul S. | last3=Szalay | first4=Amy | last4=Weisgerber | first5=Kim R. | last5=Dunbar | date=August 2004 | isbn=978-0-471-46075-6}}
: {{chem2|M + 2NOBF4 + xCH3CN → [M(CH3CN)x](BF4)2 + 2NO}}
With ferrocene the ferrocenium tetrafluoroborate is formed.{{cite journal | title = Solvent and electrolyte effects on the kinetics of ferrocenium-ferrocene self-exchange. A reevaluation |author1=Roger M. Nielson |author2=George E. McManis |author3=Lance K. Safford |author4=Michael J. Weaver | journal = J. Phys. Chem. | doi = 10.1021/j100342a086 | year = 1989 | volume = 93 | issue = 5 | pages = 2152}}
In its infrared spectrum of this salt, νNO is a strong peak at 2387 cm−1.{{cite journal |doi=10.1039/JR9630003557 |title=670. The Infrared Spectrum of the Nitrosonium Ion |date=1963 |last1=Sharp |first1=D. W. A. |last2=Thorley |first2=J. |journal=Journal of the Chemical Society (Resumed) |page=3557 }}
References
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{{Tetrafluoroborates}}
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