Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q420614> ?p ?o }
Showing triples 1 to 59 of
59
with 100 triples per page.
- Q420614 subject Q52325.
- Q420614 abstract "Coronene (also known as superbenzene) is a polycyclic aromatic hydrocarbon (PAH) comprising six peri-fused benzene rings. Its chemical formula is C24H12. It is a yellow material that dissolves in such solvents as benzene, toluene, and dichloromethane. Its solutions emit blue light fluorescence under UV light. Its emission spectrum is not symmetrical with its excitation spectrum and varies in the number of bands and their relative intensities depending on the solvent. It has been used as a solvent probe, similar to pyrene.It occurs naturally as the very rare mineral carpathite, which is characterized by flakes of pure coronene embedded in sedimentary rock. This mineral may be created from ancient hydrothermal vent activity. In earlier times this mineral was also called Karpatite or Pendletonite.Coronene is produced in the petroleum-refining process of hydrocracking, where it can dimerize to a fifteen ring PAH, trivially named "dicoronylene" (formally named benzo[10,11]phenanthro[2',3',4',5',6':4,5,6,7]chryseno[1,2,3-bc]coronene or benzo[1,2,3-bc:4,5,6-b'c']dicoronene).The compound is of theoretical interest to organic chemists because of its aromaticity. It can be described by 20 resonance structures or by a set of three mobile Clar sextets. In the Clar sextet case, the most stable structure for coronene has only the three isolated outer sextets as fully aromatic although superaromaticity would still be possible when these sextets are able to migrate into the next ring.According to in silico calculations on the following hypothetical isodesmic reactions, coronene has a somewhat higher resonance energy per pi electron (REPE) than benzene:coronene + 24 * ethylene → 18 * butadiene REPE 4.2 kcal/mol (17.6 kJ/mol)benzene + 3 * ethylene → 3 * butadiene REPE 3.6 kcal/mol (15 kJ/mol)On the other hand, the perimeter C–C bond length alternations are larger than in benzene.".
- Q420614 thumbnail Coronene_structure.png?width=300.
- Q420614 wikiPageWikiLink Q1027170.
- Q420614 wikiPageWikiLink Q10859916.
- Q420614 wikiPageWikiLink Q11391.
- Q420614 wikiPageWikiLink Q1153832.
- Q420614 wikiPageWikiLink Q130964.
- Q420614 wikiPageWikiLink Q13365147.
- Q420614 wikiPageWikiLink Q151313.
- Q420614 wikiPageWikiLink Q15779.
- Q420614 wikiPageWikiLink Q159226.
- Q420614 wikiPageWikiLink Q161503.
- Q420614 wikiPageWikiLink Q176140.
- Q420614 wikiPageWikiLink Q1778729.
- Q420614 wikiPageWikiLink Q178674.
- Q420614 wikiPageWikiLink Q191807.
- Q420614 wikiPageWikiLink Q192572.
- Q420614 wikiPageWikiLink Q2025.
- Q420614 wikiPageWikiLink Q20745766.
- Q420614 wikiPageWikiLink Q210390.
- Q420614 wikiPageWikiLink Q21099674.
- Q420614 wikiPageWikiLink Q212749.
- Q420614 wikiPageWikiLink Q2161141.
- Q420614 wikiPageWikiLink Q2270.
- Q420614 wikiPageWikiLink Q25269.
- Q420614 wikiPageWikiLink Q2702672.
- Q420614 wikiPageWikiLink Q3026674.
- Q420614 wikiPageWikiLink Q3270405.
- Q420614 wikiPageWikiLink Q375669.
- Q420614 wikiPageWikiLink Q399771.
- Q420614 wikiPageWikiLink Q40603.
- Q420614 wikiPageWikiLink Q407212.
- Q420614 wikiPageWikiLink Q407733.
- Q420614 wikiPageWikiLink Q41509.
- Q420614 wikiPageWikiLink Q415723.
- Q420614 wikiPageWikiLink Q416015.
- Q420614 wikiPageWikiLink Q421748.
- Q420614 wikiPageWikiLink Q49546.
- Q420614 wikiPageWikiLink Q498946.
- Q420614 wikiPageWikiLink Q5150209.
- Q420614 wikiPageWikiLink Q52325.
- Q420614 wikiPageWikiLink Q5748616.
- Q420614 wikiPageWikiLink Q723069.
- Q420614 wikiPageWikiLink Q7644703.
- Q420614 wikiPageWikiLink Q7946.
- Q420614 wikiPageWikiLink Q818497.
- Q420614 wikiPageWikiLink Q863695.
- Q420614 wikiPageWikiLink Q880.
- Q420614 wikiPageWikiLink Q907287.
- Q420614 wikiPageWikiLink Q911365.
- Q420614 type ChemicalCompound.
- Q420614 type ChemicalSubstance.
- Q420614 type ChemicalObject.
- Q420614 type Thing.
- Q420614 type Q11173.
- Q420614 comment "Coronene (also known as superbenzene) is a polycyclic aromatic hydrocarbon (PAH) comprising six peri-fused benzene rings. Its chemical formula is C24H12. It is a yellow material that dissolves in such solvents as benzene, toluene, and dichloromethane. Its solutions emit blue light fluorescence under UV light. Its emission spectrum is not symmetrical with its excitation spectrum and varies in the number of bands and their relative intensities depending on the solvent.".
- Q420614 label "Coronene".
- Q420614 depiction Coronene_structure.png.