Carbon diselenide

Structural formula
General
Surname	Carbon diselenide
other names	Selenium carbon Diselene carbide
Molecular formula	CSe 2
Brief description	golden yellow liquid
External identifiers / databases
CAS number 506-80-9 EC number 208-054-9 ECHA InfoCard 100.007.323 PubChem 68174 Wikidata Q2664750
properties
Molar mass	169.93 g mol −1
Physical state	liquid
density	2.66 g cm −3
Melting point	−43.7 ° C
boiling point	125 ° C
Refractive index	1.845 (20 ° C)
safety instructions
GHS hazard labeling no classification available
Thermodynamic properties
ΔH f 0	164.8 kJ / mol
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

Carbon diselenide is an inorganic chemical compound of carbon from the group of selenides .

Extraction and presentation

Carbon diselenide can be obtained by reacting dichloromethane with selenium at 520 ° C.

${\displaystyle \mathrm {CH_{2}Cl_{2}+2\ Se\longrightarrow CSe_{2}+2\ HCl} }$

It is also possible to produce it by reacting hydrogen selenide with tetrachloromethane .

properties

Carbon diselenide is a golden yellow, highly refractive liquid that smells like rotten radish and is insoluble in water. It is yellow in color and soluble in carbon disulfide , carbon tetrachloride , diethyl ether , benzene , nitrobenzene , dioxane , ethyl acetate , acetone , but slightly soluble in glacial acetic acid and alcohol . The connection is very sensitive to light. It polymerizes first brown then black when standing, but can be kept almost indefinitely at −30 ° C in the dark. When heated in a closed tube to 150 ° C, it turns into a black solid mass. Sulfur powder dissolves abundantly in carbon diselenide, red selenium hardly. When heated, the compound decomposes on contact with nitric acid and sodium hydroxide . A high-frequency discharge can be used to extract carbon monoselenide (structure similar to carbon monoxide ).

Individual evidence

1. ↑ ^{a b c d e f g h} Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 627.
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
3. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-20.
4. ^ ^{A b c} A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 628.