Sodium hyponitrite is a solid ionic compound with formula Na 2N 2O 2 or (Na+ )2[ON=NO]2−.[1]
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.[1][2]
A variety of hydratesNa 2N 2O 2(H 2O)x of the trans isomer have been reported, with x including 2, 3.5, 4, 5, 6, 7, 8, and 9;[11][3][12] but there is some dispute.[13]
The hydration water seems to be just trapped in the crystal lattice rather than coordinated to the ions.[13] The anhydrous substance can be obtained by drying the hydrates over phosphorus pentoxide and then heating them to 120 °C.[13]
The cis isomer of sodium hyponitrite is a white crystalline solid, insoluble in aprotic solvents, and (unlike the trans isomer) decomposed by water and other protic solvents.[2]
The cis isomer of can be prepared by passing nitric oxide (NO) through a solution of sodium metal in liquid ammonia at −50 °C.[1]
The cis isomer was also obtained in 1996 by C. Feldmann and M. Jansen by heating sodium oxideNa 2O with 77 kPaofnitrous oxideN 2O (laughing gas) in a sealed tube at 360 °C for 2 hours. The two reagents combined to yield the cis hyponitrite quantitatively as white microcrystals.[8][2]
^ abcdeEgon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN0-12-352651-5
^ 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
^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
^ 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 29–32 doi: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
