Selenium oxychloride

Structural formula
General
Surname	Selenium oxychloride
other names	Selenium oxychloride Seleninyl dichloride Selenium oxide dichloride Selenium dichloride oxide Selenyl chloride
Molecular formula	SeOCl 2
Brief description	yellow liquid with a chlorine-like odor
External identifiers / databases
CAS number 7791-23-3 EC number 232-244-0 ECHA InfoCard 100.029.313 PubChem 24647 Wikidata Q2991005
properties
Molar mass	165.87 g mol −1
Physical state	liquid
density	2.42 g cm −3
Melting point	8.5 ° C
boiling point	176.4 ° C
Vapor pressure	0.4 mbar (20 ° C)
solubility	violent decomposition in water
Refractive index	1.651 (20 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 301-331-373-410 EUH: 014 P: 261-273-301 + 310-311-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Selenium oxide chloride is an inorganic chemical compound of selenium from the group of oxide chlorides . It is the chloride of selenious acid (H ₂ SeO ₃ ).

Extraction and presentation

Selenium oxide chloride can be obtained by a two-stage reaction of selenium dioxide with hydrogen chloride .

${\displaystyle \mathrm {SeO_{2}+2\ HCl\longrightarrow SeO_{2}\cdot 2\ HCl} }$

${\displaystyle \mathrm {SeO_{2}\cdot 2\ HCl+H_{2}SO_{4}\longrightarrow SeOCl_{2}+H_{2}SO_{4}\cdot H_{2}O} }$

Alternatively, selenium dioxide can also be reacted with thionyl chloride at 50 ° C. to form selenium oxide chloride.

${\displaystyle \mathrm {SeO_{2}+SOCl_{2}\longrightarrow SeOCl_{2}+SO_{2}} }$

properties

Selenium oxychloride is a non-flammable, little volatile, straw-yellow, hygroscopic liquid that smokes in moist air, which decomposes in water to form hydrogen chloride and selenium acid and is infinitely miscible with carbon tetrachloride , trichloromethane , carbon disulphide , benzene and toluene . It forms colorless crystals at temperatures below 8 ° C.

use

Selenium oxychloride is occasionally used as a solvent because of its solubility for almost all substances .

Individual evidence

1. ↑ ^{a b c d e f g} Data sheet Selenium dichloride oxide, 99% (metals basis) from AlfaAesar, accessed on November 30, 2013 ( PDF )(JavaScript required) .
2. ↑ ^{a b c d e f} Entry on selenium oxychloride in the GESTIS substance database of the IFA , accessed on July 23, 2016(JavaScript required) .
3. ↑ ^{a b c d} Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 423.