Chlorine monofluoride

Chlorine monofluoride is a volatile interhalogen compound with the chemical formula ClF. It is a colourless gas at room temperature and is stable even at high temperatures. When cooled to −100 °C, ClF condenses as a pale yellow liquid. Many of its properties are intermediate between its parent halogens, Cl2 and F2.[1]

Chlorine monofluoride
IUPAC name
Chlorine monofluoride
Other names
Chlorine fluoride
3D model (JSmol)
ECHA InfoCard 100.029.300
Molar mass 54.45 g/mol
Density 1.62 g mL
(liquid, −100 °C)
Melting point −155.6 °C (−248.1 °F; 117.5 K)
Boiling point −100.1 °C (−148.2 °F; 173.1 K)
0.881 D
(2.94 × 10−30 C m)
33.01 J K−1 mol−1
217.91 J K−1 mol−1
−56.5 kJ mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references


Chlorine monofluoride is a versatile fluorinating agent, converting metals and non-metals to their fluorides and releasing Cl2 in the process. For example, it converts tungsten to tungsten hexafluoride and selenium to selenium tetrafluoride:

W + 6 ClF → WF6 + 3 Cl2
Se + 4 ClF → SeF4 + 2 Cl2

ClF can also chlorofluorinate compounds, either by addition across a multiple bond or via oxidation. For example, it adds fluorine and chlorine to the carbon of carbon monoxide, yielding carbonyl chloride fluoride:

CO + ClF →

See also


  1. Otto Ruff, E. Ascher (1928). "Über ein neues Chlorfluorid-CIF3". Zeitschrift für anorganische und allgemeine Chemie. 176 (1): 258–270. doi:10.1002/zaac.19281760121.
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