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
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)
Structure

Dipole moment

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

Heat capacity (C)

| 33.01 J K−1 mol−1

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

| 217.91 J K−1 mol−1

Std enthalpy of
formation (ΔfH⦵298)

| −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).

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, Cl2 and F2.[1]

## Contents

* 1 Geometry
* 2 Reactivity
* 3 See also
* 4 References
* 5 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 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

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:

CO + ClF →

## 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.

## 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

Fluorine compounds

| HF |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | He

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LiF | BeF2 |  |  |  |  |  |  |  |  |  |  | BF3
B2F4 | CF4 | NF3 | OF2 | F− | Ne
NaF | MgF2 |  |  |  |  |  |  |  |  |  |  | AlF3 | SiF4 | PF3
PF5 | SF2
SF4
SF6 | ClF
ClF3
ClF5 | Ar
KF | CaF2 | ScF3 | TiF3
TiF4 | VF3
VF4
VF5 | CrF2
CrF3
CrF4
CrF5 | MnF2
MnF3 | FeF2
FeF3 | CoF2
CoF3 | NiF2 | CuF
CuF2 | ZnF2 | GaF3 | GeF4 | AsF3
AsF5 | SeF4
SeF6 | BrF3
BrF5 | KrF2
RbF | SrF2 | YF3 | ZrF4 | NbF4
NbF5 | MoF5
MoF6 | TcF6 | RuF3
RuF4
RuF5
RuF6 | RhF6 | PdF2 | AgF
AgF2
Ag2F | CdF2 | InF3 | SnF2
SnF4 | SbF3
SbF5 | TeF4 | IF
IF3
IF5
IF7 | XeF2
XeF4
XeF6
CsF | BaF2 | *  | HfF4 | TaF5 | WF4
WF6 | ReF4
ReF5
ReF6
ReF7 | OsF4
OsF5
OsF6 | IrF3
IrF5
IrF6 | PtF4
PtF6 | AuF3
Au2F10
AuF5·F2
| HgF2
Hg2F2 | TlF
TlF3 | PbF2
PbF4 | BiF3
BiF5 | Po | At | RnF2
Fr | Ra | **  | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og
|  | ↓ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| * | LaF3 | CeF3 | Pr | NdF3 | PmF3 | SmF3
| Eu | Gd | Tb | DyF3 | Ho | Er | Tm | YbF3
| Lu |
| ** | AcF3 | ThF4 | Pa | UF3
UF4
UF5
UF6 | NpF3
NpF4
NpF5
NpF6
| PuF3
PuF4
PuF5
PuF6 | AmF3
AmF4 | CmF3 | Bk | Cf | Es | Fm | Md | No | Lr |

Other|

* AgBF4
* AgPF6
* Cs2AlF5
* K3AlF6
* Na3AlF6
* KAsF6
* LiAsF6
* NaAsF6
* HBF4
* KBF4
* LiBF4
* NaBF4
* RbBF4
* Ba(BF4)2
* Ni(BF4)2
* Pb(BF4)2
* Sn(BF4)2
* BaClF
* BaSiF6
* BaGeF6
* BrOF3
* BrO2F
* CBrF3
* CBr2F2
* CBr3F
* CClF3
* CCl2F2
* CCl3F
* CFN
* CF2O
* CF3I
* CHF3
* CH2F2
* CH3F
* C2Cl3F3
* C2H3F
* C6H5F
* C7H5F3
* C15F33N
* ClFO2
* CrFO4
* CrF2O2
* CsBF4
* NH4F
* FNO
* FNO2
* FNO3
* KHF2
* NaHF2
* ThOF2
* NH5F2
* (NH4)2SiF6
* F2OS
* F3OP
* PSF3
* HPF6
* HSbF6
* NH4PF6
* KPF6
* KSbF6
* LiPF6
* NaPF6
* NaSbF6
* Na2SiF6
* Na2TiF6
* Na2ZrF6
* TlPF6
* IOF3
* K2NbF7
* K2TaF7
* IO3F
* UO2F2

Chemical formulas

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