Selenium hexafluoride

Selenium hexafluoride  |

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Names
IUPAC name

Selenium hexafluoride

Other names

Selenium(VI) fluoride, Selenium fluoride

Identifiers

CAS Number

* 7783-79-1 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 22964 N

PubChem CID

* 24558

RTECS number |

* VS9450000

UNII |

* H91D37I668 Y

InChI

* InChI=1S/F6Se/c1-7(2,3,4,5)6 N

Key: LMDVZDMBPZVAIV-UHFFFAOYSA-N N

* InChI=1S/F6Se/c1-7(2,3,4,5)6

Key: LMDVZDMBPZVAIV-UHFFFAOYAP

SMILES

* F[Se](F)(F)(F)(F)F

Properties

Chemical formula

| SeF6
Molar mass | 192.9534 g/mol
Appearance  | colourless gas
Density | 0.007887 g/cm3[1]
Melting point |  −39 °C (−38 °F; 234 K)
Boiling point |  −34.5 °C (−30.1 °F; 238.7 K) sublimes

Solubility in water

| insoluble
Vapor pressure | >1 atm (20°C)[2]

Magnetic susceptibility (χ)

| −51.0·10−6 cm3/mol

Refractive index (nD)

| 1.895
Structure

Crystal structure

| Orthorhombic, oP28

Space group

| Pnma, No. 62

Coordination geometry

| octahedral (Oh)

Dipole moment

| 0
Thermochemistry

Std enthalpy of
formation (ΔfH⦵298)

| -1030 kJ/mol[3]
Hazards
Main hazards | toxic, corrosive
NFPA 704 (fire diamond)  |

Lethal dose or concentration (LD, LC):

LCLo (lowest published)

| 10 ppm (rat, 1 hr)
10 ppm (mouse, 1 hr)
10 ppm (guinea pig, 1 hr)[4]
NIOSH (US health exposure limits):

PEL (Permissible)

| TWA 0.05 ppm (0.4 mg/m3)[2]

REL (Recommended)

| TWA 0.05 ppm[2]

IDLH (Immediate danger)

| 2 ppm[2]

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

Selenium hexafluoride is the inorganic compound with the formula SeF6. It is a very toxic colourless gas described as having a "repulsive" odor.[5] It is not widely encountered and has no commercial applications.[6]

## Contents

* 1 Structure, preparation, and reactions
* 2 Safety
* 3 References
* 4 External links

## Structure, preparation, and reactions

SeF6 has octahedral molecular geometry with an Se−F bond length of 168.8 pm. In terms of bonding, it is hypervalent.

SeF6 can be prepared from the elements.[7] It also forms by the reaction of bromine trifluoride (BrF3) with selenium dioxide. The crude product can be purified by sublimation.

The relative reactivity of the hexafluorides of S, Se, and Te follows the order TeF6 > SeF6 > SF6, the latter being completely inert toward hydrolysis until high temperatures. SeF6 also resists hydrolysis.[3] The gas can be passed through 10% NaOH or KOH without change, but reacts with gaseous ammonia at 200 °C.[8]

## Safety

Although selenium hexafluoride is quite inert and slow to hydrolyze, it is toxic even at low concentrations,[9] especially by longer exposure. In the U.S., OSHA and ACGIH standards for selenium hexafluoride exposure is an upper limit of 0.05 ppm in air averaged over an eight-hour work shift. Additionally, selenium hexafluoride is designated as IDLH chemical with a maximum allowed exposure limit of 2 ppm.[10]

## References

1. ↑ Lide, D. R., ed (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
2. ↑ 2.0 2.1 2.2 2.3 NIOSH Pocket Guide to Chemical Hazards. "#0551". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0551.html.
3. ↑ 3.0 3.1 Wiberg, E.; Holleman, A. F. (2001). Inorganic Chemistry. Elsevier. ISBN 0-12-352651-5.
4. ↑ "Selenium hexafluoride". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/idlh/7783791.html.
5. ↑ "Material Safety". http://www.cpcb.nic.in/divisionsofheadoffice/pci-ssi/MATERIAL_SAFETY-DATABASE/MSDS2008/558.pdf.
6. ↑ Langner, B. E.. "Ullmann's Encyclopedia of Industrial Chemistry". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a23_525.
7. ↑ Yost, D. M.; Simons, J. H. (1939). "Sulfur, Selenium, and Tellurium Hexafluorides". Inorganic Syntheses. 1. pp. 121–122. doi:10.1002/9780470132326.ch44. ISBN 9780470132326.
8. ↑ Krebs, B.; Bonmann, S.; Eidenschink, I. (1994). "Selenium-Inorganic Chemistry". in King, R. B.. Encyclopedia of Inorganic Chemistry. John Wiley & Sons. ISBN 0-471-93620-0.
9. ↑ "Medical Management Guidelines for Selenium Hexafluoride (SeF6)". CDC ATSDR. http://www.atsdr.cdc.gov/MMG/MMG.asp?id=1015&tid=215.
10. ↑ Documentation for Immediately Dangerous To Life or Health Concentrations (IDLHs)

## External links

* ATSDR ToxFAQs - Selenium Hexafluoride U.S. Department of Health and Human Services
* CDC - NIOSH Pocket Guide to Chemical Hazards U.S. Department of Health and Human Services
* WebBook page for SeF6

* v
* t
* e

Binary hexafluorides

Known binary hexafluorides|

| Chalcogen binary hexafluorides|

* SF6
* SeF6
* TeF6
* PoF6

|

Noble gas binary hexafluorides|

* XeF6

Transition metal binary hexafluorides|

* MoF6
* TcF6
* RuF6
* RhF6
* WF6
* ReF6
* OsF6
* IrF6
* PtF6

Actinide binary hexafluorides|

* UF6
* NpF6
* PuF6

Predicted binary hexafluorides|

| Noble gas binary hexafluorides|

* KrF6
* RnF6

|

Transition metal binary hexafluorides|

* CrF6
* PdF6

Actinide binary hexafluorides|

* AmF6

* v
* t
* e

Selenium compounds

Se(−II)|

* Ag2Se
* Al2Se3
* CaSe
* Se2−

Se(0,I)|

* Se3S5

Se(I)|

* Se2S6
* Se2Cl2
* C3H7NO2Se

Se(II)|

* SeS2

Se(IV)|

* SeCl4
* SeF4
* SeO2
* SeS2
* SeOBr2
* SeOCl2

Se(VI)|

* SeF6
* SeO3
* SeO2F2

* 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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