Oxofluorides and oxochlorides of nitrogen

The oxohalides FNO, CINO, FNO2 and CINO2 combine with suitable fluorides or chlorides to give salts containing [NO] or [N02], e.g. reactions 15.74-15.76. 

The main factor involved in the change from covalent to ionic halide is believed to be the enthalpy change accompanying the attachment of the halide ion to the halide acceptor. 

Nitryl fluoride, FNO2, and nitryl chloride, CINO2, are prepared, respectively, by fluorination of N2O4 (reaction 14.67) and oxidation of CINO (using e.g. CI2O or O3). Both are planar molecules FNO2 is isoelectronic with [NO3]-. 

Box 14.6 Crystal structure disorders disorders involving F and O atoms 

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