Chlorine monofluoride

Chlorine monofluoride
IUPAC name Chlorine monofluoride
Other names Chlorine fluoride
Identifiers
CAS number	7790-89-8 Y=
PubChem	123266
Properties
Molecular formula	ClF
Molar mass	54.45 g/mol
Density	1.62 g mL (liquid, −100 °C)
Melting point	−155.6 °C
Boiling point	−100.1 °C
Structure
Dipole moment	0.881 D (2.94 × 10−30 C m)
Thermochemistry
Std enthalpy of formation ΔfHo298	−56.5 kJ mol−1
Standard molar entropy So298	217.91 J K−1 mol−1
Specific heat capacity, C	33.01 J K−1 mol−1
Y (verify) (what is: Y/N?) 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.

Reactivity

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 →

See also

• Chlorine fluorides

External links

• National Pollutant Inventory - Fluoride and compounds fact sheet
• WebBook page for ClF