Title: Dicyanodiamide
CAS Registry Number: 461-58-5
CAS Name: Cyanoguanidine
Molecular Formula: C2H4N4
Molecular Weight: 84.08
Percent Composition: C 28.57%, H 4.80%, N 66.64%
Literature References: Prepared by controlled polymerization of cyanamide in water in the presence of ammonia, alkaline earth hydroxides, or other suitable bases: Grube, Nitsche, Z. Angew. Chem. 27, 368 (1914); Pinck, Hetherington, Ind. Eng. Chem. 27, 834 (1935); Pinck, Inorg. Synth. 3, 43 (1950).
Properties: Monoclinic prismatic crystals from water or alcohol, mp 209.5°. d425 1.400. Eutectic with cyanamide at 35.6° (15% dicyanodiamide). Specific heat 0.456 at 0-204°. Neutral reaction. Soly in water at 13°: 2.26%, more sol in hot water. Solns above 80° dec slowly, yielding ammonia. Soly in abs ethanol at 13°: 1.26%; in ether: 0.01%. Insol in benzene, chloroform. Sol in liq ammonia.
Melting point: mp 209.5°
Density: d425 1.400
Use: In the plastics industry (manuf of melamine). In the pharmaceutical industry (barbiturates, guanidine derivs).

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