Sodium Selenide
Title: Sodium Selenide
CAS Registry Number: 1313-85-5
Molecular Formula: Na2Se
Molecular Weight: 124.94
Percent Composition: Na 36.80%, Se 63.20%
Literature References: Prepd by adding selenium to a soln of sodium in liquid ammonia: Hugot, Compt. Rend. 129, 299 (1899); Ann. Chim. Phys. [7] 21, 34 (1900); Feher in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 421.
Properties: Amorphous crystals. d10 2.625. mp >875°. Turns red on exposure to air and deliquesces. Dec in water. Insol in ammonia.
Melting point: mp >875°
Density: d10 2.625
 
Derivative Type: Hemienneahydrate
Properties: Fine needles. Turns red on exposure to air and deliquesces.
 
Derivative Type: Decahydrate
Properties: Needles. Turns red and then brown on exposure to air.
 
Derivative Type: Hexadecahydrate
Properties: Prisms. mp 40°. Dec in air to sodium carbonate, selenium and a small amount of sodium selenide.
Melting point: mp 40°

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