Sodium hyponitrite
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3D model (JSmol)
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| Properties | |
| Na2N2O2 | |
| Molar mass | 105.99 g/mol |
| Appearance | colorless crystals |
| Density | 2.466 g/cm3 |
| Melting point | 100 °C (212 °F; 373 K) |
| Boiling point | 335 °C (635 °F; 608 K) decomposes |
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| Solubility | insoluble in ethanol |
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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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Sodium hyponitrite is a solid ionic compound with formula Na
2N
2O
2 or (Na+
)2[ON=NO]2-.
There are cis and trans forms of the hyponitrite ion N
2O2−
2. The trans form is more common, but the cis form can be obtained too, and it is more reactive than the trans form.
The trans isomer is colorless and soluble in water and insoluble in ethanol and ether.
Sodium hyponitrite (trans) is conventionally prepared by reduction of sodium nitrite with sodium amalgam.
Sodium hyponitrite (trans) was prepared in 1927 by A. W. Scott by reacting alkyl nitrites, hydroxylammonium chloride, and sodium ethoxide
An earlier method, published by D. Mendenhall in 1974, reacted gaseous nitric oxide (NO) with sodium metal in 1,2-dimethoxyethane, toluene, and benzophenone. The salt was then extracted with water. The method was later modified to use pyridine.
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