Selenium Oxydichloride

Selenium oxydichloride
Names
	IUPAC name Selenium oxychloride
	Other names Seleninyl chloride
Identifiers
CAS Number	7791-23-3 ;
3D model (JSmol)	Interactive image;
ChemSpider	23049 ;
EC Number	232-244-0;
PubChem CID	24647;
RTECS number	VS7000000;
UNII	1G57T5401W ;
	InChI InChI=1S/Cl2OSe/c1-4(2)3 Key: LIRMPIXWGWLNND-UHFFFAOYSA-N ; InChI=1/Cl2OSe/c1-4(2)3 Key: LIRMPIXWGWLNND-UHFFFAOYAX;
	SMILES O=[Se](Cl)Cl;
Properties
Chemical formula	SeOCl2
Molar mass	165.87 g/mol
Appearance	colorless liquid
Density	2.43 g/cm3, liquid
Melting point	10.9 °C (51.6 °F; 284.0 K)
Boiling point	177.2 °C (351.0 °F; 450.3 K)
Refractive index (nD)	1.651 (20 °C)
Structure
Molecular shape	trigonal pyramidal
Hazards
GHS pictograms
GHS Signal word	Warning
GHS hazard statements	H301, H314, H331, H373, H410
GHS precautionary statements	P260, P261, P264, P270, P271, P273, P280, P301+310, P301+330+331, P303+361+353, P304+340, P305+351+338, P310, P311, P314, P321, P330, P363, P391, P403+233, P405, P501
NFPA 704 (fire diamond)	0 3 1
	Lethal dose or concentration (LD, LC):
LDLo (lowest published)	2 mg/kg (rabbit, dermal)
Related compounds
Related compounds	SOCl2, POCl3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Selenium oxydichloride is the inorganic compound with the formula SeOCl₂. It is a colorless liquid. With a high dielectric constant (55) and high specific conductance, it is an attractive solvent. Structurally, it is a close chemical relative of thionyl chloride SOCl₂, being a pyramidal molecule.

Preparation and reactions

Selenium oxydichloride can be prepared by several methods, and a common one involves the conversion of selenium dioxide to dichloroselenious acid followed by dehydration:^[3]

SeO₂ + 2 HCl → Se(OH)₂Cl₂

Se(OH)₂Cl₂ → SeOCl₂ + H₂O

The original synthesis involved the redistribution reaction of selenium dioxide and selenium tetrachloride.

The compound hydrolyzes readily to form hydrogen chloride and selenium dioxide.

References

↑ "Selenium compounds (as Se)". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/idlh/7782492.html.
↑ "Selenium oxychloride" (in en). https://pubchem.ncbi.nlm.nih.gov/compound/24647#section=Safety-and-Hazards.
↑ Smith, G. B. L.; Jackson, Julius (1950). "Selenium(IV) Oxychloride". Inorganic Syntheses. Inorganic Syntheses. 3. pp. 130–137. doi:10.1002/9780470132340.ch34. ISBN 9780470132340.

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[1] "Selenium compounds (as Se)". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/idlh/7782492.html.

[2] "Selenium oxychloride" (in en). https://pubchem.ncbi.nlm.nih.gov/compound/24647#section=Safety-and-Hazards.

[3] Smith, G. B. L.; Jackson, Julius (1950). "Selenium(IV) Oxychloride". Inorganic Syntheses. Inorganic Syntheses. 3. pp. 130–137. doi:10.1002/9780470132340.ch34. ISBN 9780470132340.

[1]

[3]

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

Selenium Oxydichloride

Preparation and reactions

See also

References