Chlorine monofluoride

Chlorine monofluoride
Chlorine monofluoride
CAS number 7790-89-8
Molecular formula ClF
Molar mass 54.45 g mol−1
Density 1.62 g mL
(liquid, −100 °C)
Melting point

−155.6 °C

Boiling point

−100.1 °C

Dipole moment 0.881 D
(2.94 × 10−30 C m)
Std enthalpy of
−56.5 kJ mol−1
Standard molar
217.91 J K−1 mol−1
Specific heat capacity, C 33.01 J K−1 mol−1
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

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 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 across the triple bond of carbon monoxide:

CO + ClF → Carbonyl-chlorofluoride-2D.png

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. 

External links

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