Chlorine monofluoride

Names
IUPAC name

Chlorine monofluoride

Other names

Chlorine fluoride

Identifiers

CAS Number

* 7790-89-8 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 109879 N

PubChem CID

* 123266

UNII |

* UE4699O6C6 Y

InChI

* InChI=1S/FCl/c1-2 N

Key: OMRRUNXAWXNVFW-UHFFFAOYSA-N N

* InChI=1/FCl/c1-2

Key: OMRRUNXAWXNVFW-UHFFFAOYAD

SMILES

* FCl

Properties

Chemical formula

| ClF
Molar mass | 54.45 g·mol−1
Appearance  | Colorless gas (slightly yellow when liquid)
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)

Solubility in water

| reacts violently
Structure

Dipole moment

| 0.881 D
(2.94 × 10−30 C m)
Thermochemistry

Heat capacity (C)

| 33.01 J/(mol·K)

Std molar
entropy (S ~~o~~ 298)

| 217.91 J/(mol·K)

Std enthalpy of
formation (ΔfH⦵298)

| −56.5 kJ/mol
Related compounds

Related compounds

* Chlorine trifluoride
* Chlorine pentafluoride
* Bromine monofluoride
* Iodine monofluoride
* Bromine monochloride
* Iodine monochloride
* Iodine monobromide
* Astatine monofluoride
* Astatine monochloride
* Astatine monobromide
* Astatine monoiodide

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

N verify (what is YN ?)
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, Cl
2 and F
2.[1]

## Contents

* 1 Geometry
* 2 Reactivity
* 3 Safety
* 4 See also
* 5 References
* 6 External links

## Geometry

The molecular structure in the gas phase was determined by microwave spectroscopy; the bond length is re = 1.628341(4) Å.[2]

The bond length in the crystalline ClF is 1.628(1) Å; the lengthening relative to the free molecule is due to an interaction of the type F-Br···ClMe with a distance of 2.640(1) Å. In its molecular packing it shows very short intermolecular Cl···Cl contacts of 3.070(1) Å between neighboring molecules.[3]

## Reactivity

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

W + 6 ClF → WF
6 \+ 3 Cl

Se + 4 ClF → SeF
4 \+ 2 Cl

FCl 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 COClF, an intermediate between phosgene and carbonyl fluoride.

CO + ClF → 50px

## Safety

Chlorine monofluoride is extremely reactive. It instantly destroys glass and ignites organic material on contact, reacts violently with water, is highly corrosive to mucous membranes and the skin, eyes, and respiratory tract, and may cause permanent blindness.[4]

## See also

* Chlorine fluorides
* Oxygen monofluoride

## References

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.
2. ↑ Willis, Robert E.; Clark, William W. (May 1980). "Millimeter wave measurements of the rotational spectra of ClF, BrF, BrCl, ICl, and IBr" (in en). The Journal of Chemical Physics 72 (9): 4946–4950. doi:10.1063/1.439780. ISSN 0021-9606. Bibcode: 1980JChPh..72.4946W. https://pubs.aip.org/aip/jcp/article/72/9/4946-4950/790283.
3. ↑ Boese, Roland; Boese, A. Daniel; Bláser, Dieter; Antipin, Michail Yu.; Ellern, Arkadi; Seppelt, Konrad (1997-08-04). "The Surprising Crystal Packing of Chlorinefluoride". Angewandte Chemie International Edition in English 36 (1314): 1489–1492. doi:10.1002/anie.199714891. ISSN 0570-0833. http://dx.doi.org/10.1002/anie.199714891.
4. ↑ https://pubchem.ncbi.nlm.nih.gov/compound/Chlorine-monofluoride

## External links

* National Pollutant Inventory - Fluoride and compounds fact sheet
* WebBook page for FCl

* v
* t
* e

Chlorine compounds

* ClF
* ClF3
* ClF5
* ClNO3
* ClO
* ClOF3
* Cl2O2
* ClO2
* ClO2F
* ClO3F
* Cl2O
* Cl2O4
* Cl2O6
* Cl2O7
* HCl
* SiCl4

* v
* t
* e

Salts and covalent derivatives of the fluoride ion

HF |  |  |  | He

|
|
|
|

LiF | BeF2 | BF
BF3
B2F4 | CF4
other compounds | NF3
FN3
N2F2
N2F4
NF5§  | F2O
F2O2
other compounds | F2 | Ne
NaF | MgF2 | AlF
AlF3 | SiF4 | P2F4
PF3
PF5 | S2F2
SF2
SF4
SF6 | ClF
ClF3
ClF5 | Ar
KF | CaF
CaF2 | ScF3 | TiF2
TiF3
TiF4 | VF2
VF3
VF4
VF5 | CrF2
CrF3
CrF4
CrF5
CrF6§  | MnF2 | FeF2
FeF3 | CoF2
CoF3 | NiF2 | CuF
CuF2 | ZnF2 | GaF2
GaF3 | GeF2
GeF4 | AsF3
AsF5 | Se2F2
SeF4
SeF6 | BrF
BrF3
BrF5 | KrF2
RbF | SrF
SrF2 | YF3 | ZrF3
ZrF4 | NbF4
NbF5 | MoF2
MoF3
MoF4
MoF5
MoF6 | TcF4
TcF6 | RuF3
RuF5
RuF6 | RhF3
RhF5
RhF6 | PdF2 | AgF | CdF2 | InF
InF2
InF3 | SnF2
SnF4 | SbF3
SbF5 | Te3F2
TeF4
TeF6 | IF
IF3</br>IF5</br>IF7 | XeF2
XeF4
XeF6
CsF | BaF2 |  | HfF4 | TaF5 | WF2
WF3
WF4
WF5
WF6 | Re3F9
ReF4
ReF5
ReF6
ReF7 | OsF4
OsF5
OsF6 | IrF2
IrF3
IrF4
IrF5
IrF6 | PtF2
PtF4
PtF5
PtF6 | AuF
AuF3
Au2F10
AuF5•F2 | Hg2F2
HgF2
HgF4 | TlF | PbF2
PbF4 | BiF3
BiF5 | PoF2
PoF4
PoF6 | AtF  | RnF2
FrF | RaF2 |  | Rf  | Db  | Sg  | Bh  | Hs  | Mt  | Ds  | Rg  | Cn  | Nh  | Fl  | Mc  | Lv  | Ts  | Og
| ↓  |  |
LaF3 | CeF3
CeF4 | PrF3 | NdF2,
NdF3 | PmF3 | SmF2,
SmF3 | EuF2,
EuF3 | GdF3 | TbF3 | DyF2,
DyF3 | HoF3 | ErF3 | TmF2
TmF3 | YbF2
YbF3 | LuF3
AcF3 | ThF4 | PaF5 | UF3
UF4
UF5
UF6 | NpF4
NpF6 | PuF3
PuF6 | AmF2
AmF3 | CmF3 | BkF3 | CfF3 | EsF3 | Fm  | Md  | No  | LrF3

§ means the substance has not been made.

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