1078 cm−1 (for the C-F). The C-F doublet band has a 24 cm−1 separation between the two branches. A triplet band is observed at around 451 cm−1. Chemical reactions Cyanogen fluoride reacts with benzene in the presence of aluminum chloride to form benzonitrile in 20% conversion. It also reacts with olefins to yield an alpha,beta-fluoronitriles. FCN also adds to olefins which have internal double bonds in the presence of strong acid catalyst. Storage FCN can be stored in a stainless steel cylinders for over a year when the temperature is -78.5 °C (solid carbon dioxide temperature). Safety Cyanogen fluoride undergoes violent reaction when in the presence of boron trifluoride or hydrogen fluoride. Pure gaseous FCN at atmospheric pressure and room temperature does not ignite by a spark or hot wire. FCN air mixtures however are more susceptible to ignition and explosion than pure FCN. Uses FCN is useful in synthesis of important compounds such as dyes, fluorescent brighteners and photographic sensitizers. It is also very useful as a fluorinating and nitrilating agent. Beta-fluoronitriles, which are produced when FCN is reacted with olefins, are useful intermediates for preparing polymers, beta-fluorocarboxylic acids and other fluorine containing products. Useful amines can be obtained. Cyanogen fluoride is a very volatile fumigant, disinfectant and animal pest killer. References Nonmetal halides Fluorine compounds Triatomic molecules Cyano compounds Pseudohalogens