Corons
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| General | |||||||||||||||||||
| Surname | Corons | ||||||||||||||||||
| other names |
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| Molecular formula | C 24 H 12 | ||||||||||||||||||
| Brief description |
yellow to green powder |
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| properties | |||||||||||||||||||
| Molar mass | 300.36 g mol −1 | ||||||||||||||||||
| Physical state |
firmly |
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| Melting point |
438-440 ° C |
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| boiling point |
525 ° C |
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| solubility |
almost insoluble in water |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||||||||
Coronene ( hexabenzobenzene ) belongs to the polycyclic aromatic hydrocarbons , more precisely to the circulenes . The molecule consists of six fused benzene rings (although when using the circle to denote aromatic rings, some authors also put a seventh circle in the inner ring).
Coronen was first represented synthetically by Kurt Meyer in 1932 .
Occurrence
Like most polycyclic aromatic molecules, coronene occurs in coal tar and in products of incomplete combustion, and also in the mineral carpathite .
properties
Coronene is a yellow to gold powder made of thread-like particles or needle-like crystals. The solid melts at 438-440 ° C, boils at 525 ° C, is insoluble in water and soluble in non-polar solvents with slightly blue fluorescence. Coronene is very stable and has a very low vapor pressure . The coronene molecule is about 1 nanometer in size; it can be made visible with a scanning tunneling microscope .
Individual evidence
- ↑ a b c d Coronen data sheet at Acros, accessed on February 21, 2010.
- ↑ Coronene data sheet at Sigma-Aldrich , accessed on May 9, 2017 ( PDF ).
- ↑ Roland Scholl, Kurt Meyer: Synthesis of the anti-diperi -dibenz-coronens and its degradation to coronene (hexabenzo-benzene). (Collaborated by Horst v. Hoeßle and Solon Brissimdji). In: Reports of the German Chemical Society (A and B Series). 65, 1932, pp. 902-915, doi : 10.1002 / cber.19320650546 .
- ↑ Entry on pendletonite. In: Römpp Online . Georg Thieme Verlag, accessed on June 7, 2014.