Johnston, Francis J. Department of Chemistry, University of Georgia, Athens, Georgia.
Last reviewed:January 2020
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A colorless, highly toxic gas having the molecular formula C2N2. Cyanogen belongs to a class of compounds known as pseudohalogens, because of the similarity of their chemical behavior to that of the halogens. Liquid cyanogen boils at −21.17°C (−6.11°F) and freezes at −27.9°C (18.2°F) at 1 atm (105 Pa). The density of the liquid is 0.954 g/ml at the boiling point.
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