Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pseudohalogens are binary inorganic compounds of the general form XY, where X is a cyanide, cyanate, thiocyanate etc. group and Y is any X, or a true halogen. Not all combinations are known to be stable. Examples of symmetrical pseudohalogens include cyanogen (CN)2, thiocyanogen (SCN)2, selenorhodane (SeCN)2, azidodithiocarbonate (N3CS2)2. Examples of unsymmetrical pseudohalogens are cyanogen halides (ICN, ClCN, BrCN), and other compounds. Sometimes nitrosyl chloride NOCl also is considered as pseudohalogen. These anions behave as halogens and the presence of the internal double bonds or triple bonds do not appear to affect their chemical behavior. Pseudohalides are the anions (or functional groups) of corresponding pseudohalogens — cyanides, rhodanides (thiocyanates and isothiocyanates), selenorhodanides etc. Cyanates, isocyanates and azides are pseudohalides too.

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