Liquid that is not very stable above 0 ° C and tends to polymerize
|External identifiers / databases|
|Molar mass||43.03 g · mol -1|
- 86 ° C
23.5 ° C
|pK s value||
|As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .|
The isocyanic acid is a reactive, little resistant Cyansauerstoffsäure which is liberated from their salts by careful acidification and at temperatures above 0 ° C polymerized . It can be kept for weeks in benzene or ether below 0 ° C. As a solution in ice water, the more dilute the solution, the longer it can be kept. Their esters are called isocyanates ; their salts are usually not referred to as isocyanates but as cyanates . The free acid polymerizes very easily to form a mixture of cyanuric acid and cyamelide . Analogous to other pseudohalogens , it can also form a dimer “ diisooxocyan ” OCN-NCO.
- Entry on isocyanic acid. In: Römpp Online . Georg Thieme Verlag, accessed on June 13, 2014.
- A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 .
- harmonized classification for this substance . A labeling of isocyanic acid in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), which was retrieved on July 19, 2019, is reproduced from a self-classification by the distributor . There is not yet a
- Beyer-Walter, Textbook of Organic Chemistry, 23rd edition, S. Hirzel Verlag 1998.
- Wissenschaft-Online-Lexika: Entry on Cyanate in the Lexikon der Chemie. , accessed February 24, 2009.