Sodium hyponitrite is a solidionic compound with formulaNa 2N 2O 2 or (Na+ )2[ON=NO]2−.[1]
There arecis andtrans forms of thehyponitrite ionN 2O2− 2. Thetrans form is more common, but thecis form can be obtained too, and it is more reactive than thetrans form.[1][2]
Other methods includedoxidation of a concentrated solution ofhydroxylamine with sodium nitrite in an alkaline medium: NH2OH (conc.) + NaNO2 + NaOH → Na2N2O2 + 2H2O;[10] or electrolysis of sodium nitrite.[11]
A variety ofhydratesNa 2N 2O 2(H 2O)x of thetrans isomer have been reported, withx including 2, 3.5, 4, 5, 6, 7, 8, and 9;[12][3][13] but there is some dispute.[14]
The hydration water seems to be just trapped in the crystal lattice rather than coordinated to the ions.[14] The anhydrous substance can be obtained by drying the hydrates overphosphorus pentoxide and then heating them to 120 °C.[14]
Thecis isomer of sodium hyponitrite is a white crystalline solid, insoluble inaprotic solvents, and (unlike thetrans isomer) decomposed by water and otherprotic solvents.[2]
Thecis isomer of sodium hyponitrite can be prepared by passingnitric oxide (NO) through a solution ofsodium metal in liquidammonia at −50 °C.[1]
Thecis isomer was also obtained in 1996 byC. Feldmann andM. Jansen by heatingsodium oxideNa 2O with 77kPa ofnitrous oxideN 2O (laughing gas) in a sealed tube at 360 °C for 2 hours. The two reagents combined to yield thecis hyponitrite quantitatively as white microcrystals.[8][2] It was also obtained in 2021 by Carl Hoff and co-workers by ball milling (mechano-chemistry) sodium oxidesodium oxideNa 2O with 30 psi ofnitrous oxideN 2O for 4 hours at room temperature.[17]
^abcdeEgon Wiberg, Arnold Frederick Holleman (2001)Inorganic Chemistry, ElsevierISBN0-12-352651-5
^abcdClaus Feldmann, Martin Jansen (1996), "cis-Sodium Hyponitrite - A New Preparative Route and a Crystal Structure Analysis". Angewandte Chemie International Edition in English, volume 35, issue 15, pages 1728–1730.doi:10.1002/anie.199617281
^abTrambaklal Mohanlal Oza, Rajnikant Hariprasad Thaker (1955), "The Thermal Decomposition of Silver Hyponitrite". Journal of the American Chemical society, volume 77, issue 19, pages 4976–4980.doi:10.1021/ja01624a007
^Addison, C. C.; Gamlen G. A.; Thompson, R. (1952). "70. The ultra-violet absorption spectra of sodium hyponitrite and sodium α-oxyhyponitrite : the analysis of mixtures with sodium nitrite and nitrate".J. Chem. Soc.:338–345.doi:10.1039/jr9520000338.
^Neumann, R. C., Jr. Bussey, R. J. (1970). "High pressure studies. V. Activation volumes for combination and diffusion of geminate tert-butoxy radicals".J. Am. Chem. Soc.92 (8):2440–2445.doi:10.1021/ja00711a039.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^abCatherine E. Housecroft; Alan G. Sharpe (2008). "Chapter 15: The group 15 elements".Inorganic Chemistry (3rd ed.). Pearson. p. 468.ISBN978-0-13-175553-6.
^G. David Mendenhall (1974), "Convenient synthesis of silver hyponitrite". Journal of the American Chemical society, volume 96, issue 15, page 5000.doi:10.1021/ja00822a054
^Р.А. Лидин,В.А. Молочко, Л.Л. Андреева,Химические свойства неорганических веществ: учебное пособие.
^Polydoropoulos, C. N. Chem. Ind. (London) 1963, 1686 and references therein.
^James Riddick Partington and Chandulal Chhotalal Shah (1931), "Investigations on hyponitrites. Part I. Sodium hyponitrite: preparation and properties". Journal of the Chemical Society (Resumed), paper CCLXXXII, pages 2071-2080.doi:10.1039/JR9310002071
^C.N. Polydoropoulos, S.D. Voliotis (1967), "Sodium hyponitrite hexahydrate". Journal of Inorganic and Nuclear Chemistry, volume 29, issue 12, pages 2899–2901.doi:10.1016/0022-1902(67)80121-0
^abcGary L. Stucky, Jack L. Lambert, R. Dean Dragsdorf (1969), "The hydrates of sodium hyponitrite". Journal of Inorganic and Nuclear Chemistry, volume 31, issue 1, pages 29–32doi:10.1016/0022-1902(69)80050-3
^Charlotte N. Conner, Caroline E. Donald, Martin N. Hughes, Christina Sami (1989), "The molar absorptivity of sodium hyponitrite". Polyhedron, volume 8, issue 21, pages 2621-2622.doi:10.1016/S0277-5387(00)81166-3
^M. N. Hughes and H. G. Nicklin (1969), "The action of dinitrogen tetroxide on sodium hyponitrite". Journal of the Chemical Society D: Chemical Communications, volume 1969, issue 2, page 80a.doi:10.1039/C2969000080A
^Jack V. Davis, Oswaldo Guio, Burjor Captain, Carl D. Hoff, "Production of cis-Na2N2O2 and NaNO3 by Ball Milling Na2O and N2O in Alkali Metal Halide Salts". ACS Omega 2021, 6, 28, 18248–18252,doi:10.1021/acsomega.1c02119
