Carbon selenide is a chemical inorganic binary compound . It consists of two elements - carbon and selenium . The chemical formula is CSe 2 .
| Carbon selenide | |
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| General | |
| Systematic name | carbon (IV) selenide |
| Chem. formula | CSe 2 |
| Physical properties | |
| condition | yellow liquid |
| Molar mass | 169.93 g / mol |
| Density | 2.69 g / cm³ |
| Thermal properties | |
| T. melt. | −43.7 ° C |
| T. bale. | 125.5 ° C |
| Chemical properties | |
| Solubility in water | insoluble |
| Structure | |
| Dipole moment | 0 D |
| Classification | |
| Reg. CAS number | 506-80-9 |
| PubChem | |
| Reg. EINECS number | |
| Smiles | |
| Inchi | |
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| Security | |
| Toxicity |  |
The compound is a pungent, yellow-orange, oily liquid; carbon disulfide analog (CS 2 ) . Photosensitive compound, insoluble in water, but soluble in organic solvents .
Synthesis , Structure, and Reactions
Carbon deselenide is a linear molecule with the symmetry operation D ∞h . It is produced by the interaction of powdered selenium with dichloromethane vapors at a temperature of about 550 ° C [1] :
Grimm and Metzger, who prepared it by combining hydrogen selenide with carbon in a hot pipe, were the first to report this [2] .
Like carbon disulfides, carbon dioxide dislenide polymerizes under high pressure. The polymer structure is connected alternately - [Se-C (= Se) -C (= Se) -Se] - [3] . The polymer is a semiconductor at room temperature; conductivity is 50 S / cm.
In addition, carbon selenide is a precursor to tetraselenfulvalen - an analog of tetratiofulvalen , which can be further used for the synthesis of organic conductors and organic superconductors .
Carbon selenide reacts with secondary amines to give dialkide diselenocarbamates [1] :
Security
Carbon selenide has a high vapor pressure . It is toxic and poses a risk of inhalation. May be dangerous due to ease of transport by the membrane . It slowly decomposes on storage (about 1% per month at −30 ° C). When received on a commercial basis, its cost is usually high [4] .
When mixed with air, CSe 2 gives an “extremely disgusting mixture that is gradually forming” [5] . It is so smelly that people from a neighboring village were forced to escape when it was first synthesized in 1936. The stench can be neutralized with bleach [6] . Because of its smell, synthetic production methods have been developed [7] .
Notes
- ↑ 1 2 W. Pan and JP Fackler, Jr. Diselenocarbamates from carbon diselenide (English) // Inorganic Syntheses : journal. - 1982. - Vol. 21 . - P. 6 . - DOI : 10.1002 / 9780470132524.ch2 .
- ↑ HG Grimm, H. Metzger. Über Darstellung und Eigenschaften des Selenkohlenstoffs (German) // Berichte der deutschen chemischen Gesellschaft (A and B Series): magazin. - 1936. - Bd. 69 , Nr. 6 . - S. 1356-1344 . - DOI : 10.1002 / cber.19360690626 .
- ↑ CE Carraher, Jr. and CU Pittman, Jr. Poly (Carbon Disulfide), Poly (Carbon Diselenide), and Polythiocyanogen (Eng.) // Inorganic Polymers: journal. - 2005. - Vol. 21 . - DOI : 10.1002 / 14356007.a14_241 .
- ↑ Carbon Diselenide CSe2 . Cse2.com. Archived April 23, 2012.
- ↑ “„ carbon diselenide has by far the worst odor this author has experienced in his lifetime of working with selenium compounds “” Wolfgang HH Gunther: Organic Selenium Compounds: Their Chemistry and Biology
- ↑ Derek. Things I Won't Work With: Carbon Diselenide. In the Pipeline: (inaccessible link) . Pipeline.corante.com. Archived April 23, 2012.
- ↑ Process for producing chalcogen containing compounds - Patent 4462938 . Freepatentsonline.com. Archived April 23, 2012.