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Nitrosylsulfuric acid

Names
IUPAC name Nitrosylsulfuric acid
Other names nitrosonium bisulfate, chamber crystals
Identifiers
CAS Number	7782-78-7
3D model (JSmol)	Interactive image
ChemSpider	74147
ECHA InfoCard	100.029.058
PubChem CID	82157
CompTox Dashboard (EPA)	DTXSID30889380
InChI InChI=1S/HNO5S/c2-1-6-7(3,4)5/h(H,3,4,5)Key: VQTGUFBGYOIUFS-UHFFFAOYSA-N InChI=1/HNO5S/c2-1-6-7(3,4)5/h(H,3,4,5)Key: VQTGUFBGYOIUFS-UHFFFAOYAM
SMILES O=NOS(=O)(=O)O
Properties
Chemical formula	HNO5S
Molar mass	127.08 g/mol
Appearance	pale yellow crystals
Density	1.612 g/mL in 40% sulfuric acid soln
Melting point	73.5 °C
Boiling point	decomposes
Solubility in water	decomposes
Solubility	soluble in H2SO4
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	oxidizer
Related compounds
Other anions	NOCl
Other cations	NaHSO4
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

Nitrosylsulfuric acid is the chemical compound with the formula NOHSO₄.

This salt is a source of the NO ion, It can also be viewed as the mixed acid anhydride of sulfuric acid and nitrous acid:

HNO₂ + H₂SO₄ → NOHSO₄ +H₂O

NOHSO₄ is useful in organic chemistry to prepare diazonium salts from amines. A typical procedure entails dissolving sodium nitrite in concentrated sulfuric acid in an ice bath.

Related NO-delivery reagents include nitrosonium tetrafluoroborate, BF₄, and nitrosyl chloride.

References

1. Hodgson, H, H.; Mahadevan, A. P. Ward, E. R. (1955). "1,4-Dinitronaphthalene". Organic Syntheses{{cite journal}}: CS1 maint: multiple names: authors list (link); Collected Volumes, vol. 3, p. 341. (diazodization followed by treatment with nitrite)
2. Sandin, R. B.; Cairns, T. L. (1943). "1,2,3-Triiodo-5-nitrobenzene". Organic Syntheses{{cite journal}}: CS1 maint: multiple names: authors list (link); Collected Volumes, vol. 2, p. 604. (diazodization followed by treatment with iodide)

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