PEL Coronene also known as superbenzene is a polycyclic aromatic hydrocarbon PAH comprising six ... coronene embedded in sedimentary rock. This mineral may result from ancient hydrothermal vent activity ... min 2162.html www.mindat.org ref Coronene is produced in the petroleum refining process of hydrocracking ... 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 . Coronene has been seen on the surface of Titan moon Titan Citation needed date May ..., the most stable structure for coronene has only the three isolated outer sextets as fully aromatic ... ring. According to in silico calculations on the following hypothetical isodesmic reactions , coronene ... Valence Isomer of Coronene Arkadiusz Ciesielski, Micha K. Cyraski, Tadeusz M. Krygowski, Patrick ... ref coronene 24 ethylene 18 butadiene REPE 4.2 kilocalorie kcal mole unit mol 17.6 kilojoule kJ mol ... of the coronene family and investigated in supramolecular electronics . They are known to Molecular .... In this geometry, the stacks of coronene disks are aligned with the length of the tube. The nanotubes ... compound lacking the central core cyclooctadecanonaene Coronene s dimer Dicoronylene References reflist PAHs Category Polycyclic aromatic hydrocarbons de Coronen fa fr Coron ne it Coronene nl Coroneen ... more details
contained large amounts of coronene and ovalene . After these were extracted and identified, a reddish ... that it was most likely the condensed dimer of coronene . Dicoronylene was later discovered to occur ... two coronene molecules fuse. It is estimated that catalytical hydrocracking produces several hundred ..., the analogous 18 ring PAH formed from coronene and ovalene chem C 56 H 22 is also formed in 1 ... catalysts, which reduces their activity. Thermal pyrolysis of coronene shows masses of dicoronylene .... These larger coronene condensates are black in color. Dicoronylene is moderately soluble in 1,2,4 trichlorobenzene and these solutions have a greenish yellow fluorescence . Unlike coronene, dicoronylene ... more details
Image Hexa peri hexabenzocoronene ChemEurJ 2000 1834 commons.jpg thumbnail 250px Crystal structure of a hexa tert butyl hexa peri hexabenzocoronene reported by M llen and cooworkers in Chem. Eur. J., 2000, 1834 1839. Supramolecular electronics is the experimental field of supramolecular chemistry that bridges the gap between molecular electronics and bulk plastics in the construction of electronic circuitry at the nanoscale sup references 1 sup . In supramolecular electronics, assemblies of Pi pi interaction pi conjugated systems on the 5 to 100 nanometer length scale are prepared by molecular self assembly with the aim to fit these structures between electrode s. With single molecules as researched in molecular electronics at the 5 nanometer scale this would be impractical. Nanofibers can be prepared from polymer s such as polyaniline and polyacetylene sup references 12 sup . Chirality chemistry Chiral oligo p phenylenevinylene s self assemble in a controlled fashion into helical wires sup references 3 sup . An example of actively researched compounds in this field are certain coronene s. References sup references 1 sup Chemistry Material marriage in electronics E. W. Meijer, Albert P. H. J. Schenning Nature journal Nature 419, 353 354 26 Sep 2002 sup references 2 sup Supramolecular electronics nanowires from self assembled conjugated systems A. P. H. J. Schenning and E. W. Meijer Chemical Communications , 2005 , 26 , 3245 3258 http www.rsc.org publishing journals CC article.asp?doi b501804h Abstract sup references 3 sup Towards supramolecular electronics A.P.H.J. Schenning et al. Synthetic Metals 147 2004 43 48 http www herz.physics.ox.ac.uk publications Schenning04a.pdf Article Category Supramolecular chemistry Electronics Category Molecular electronics Category Nanoelectronics ... more details
chembox Watchedfields changed verifiedrevid 424699386 ImageFile Ovalene.png ImageName Skeletal formula ImageFile1 Ovalene 3D balls.png ImageName1 Ball and stick model IUPACName Ovalene OtherNames Section1 Chembox Identifiers Abbreviations CASNo Ref cascite correct ?? CASNo 190 26 1 EINECS 205 880 1 PubChem 67446 SMILES c1cc2c3c4c1ccc5cc6c7c8c ccc9 c8c1c cc9 cc c3c1c7c54 cc2 cc6 InChI RTECS MeSHName ChEBI Ref ebicite correct EBI ChEBI KEGG Ref keggcite correct kegg KEGG ATCCode prefix ATCCode suffix ATC Supplemental Section2 Chembox Properties Formula C sub 32 sub H sub 14 sub MolarMass 398.45 g mol Appearance Density MeltingPt Melting notes BoilingPt Boiling notes Solubility SolubleOther Solvent pKa pKb Section7 Chembox Hazards EUClass EUIndex MainHazards NFPA H NFPA F NFPA R NFPA O RPhrases SPhrases RSPhrases FlashPt Autoignition ExploLimits PEL Ovalene is a polycyclic aromatic hydrocarbon with the formula C sub 32 sub H sub 14 sub , which consists of ten peri fused six membered rings. It is very similar to coronene . Ovalene is a reddish orange compound. It is sparingly soluble in solvents such as benzene , toluene , and dichloromethane . Its solutions have a green fluorescence under UV light . Ovalene has been shown to form in deep sea hydrothermal vent areas and in the hydrocracking process of petroleum refining. References cite book last Fetzer first J. C. title The Chemistry and Analysis of the Large Polycyclic Aromatic Hydrocarbons location New York publisher Wiley year 2000 External links http webbook.nist.gov cgi cbook.cgi?Name Ovalene Ovalene datapage at NIST Category Polycyclic aromatic hydrocarbons PAHs fa fr Oval ne nl Ovaleen ja pl Owalen ru ... more details
, Scholl was the first person to synthesise coronene. Over the course of his career, Scholl published ... language German On the first synthesis of coronene cite journal last Scholl first Roland authorlink ... more details
The columnar phase is a class of mesophase s in which molecules assemble into cylindrical structures to act as mesogen s. Originally, these kinds of liquid crystal s were called discotic liquid crystals because the columnar structures are composed of flat shaped discotic molecules stacked one dimensionally. Since recent findings provide a number of columnar liquid crystals consisting of non discoid mesogens, it is more common now to classify this state of matter and compounds with these properties as columnar liquid crystals. Takuzo Aida and co workers recently reported cyclic peptides that self assemble into polar columnar organizations. These materials can be unidirectionally aligned over large areas by application of an external electric field. ref Kohei Sato, Yoshimitsu Itoh, and Takuzo Aida http pubs.acs.org doi abs 10.1021 ja203894r ref Classes Columnar liquid crystals are grouped by their structural order and the ways of packing of the columns. Nematic columnar liquid crystals have no long range order and are less organized than other columnar liquid crystals. Other columnar phases with long range order are classified by their two dimensional lattices hexagonal, tetragonal, rectangular, and oblique phases. The discotic nematic phase includes nematic liquid crystals composed of flat shaped discotic molecules without long range order. In this phase, molecules do not form specific columnar assemblies but only float with their short axes in parallel to the director a unit vector which defines the liquid crystalline alignment and order . Current topics of interest The first discotic liquid crystal was found in 1977 by the Indian researcher Sivaramakrishna Chandrasekhar . This molecule has one central benzene ring surrounded by six alkane alkyl chains. Since then, a large number of discoid mesogen ic compounds have been discovered in which triphenylene , porphyrin , phthalocyanine , coronene , and other aromatic molecules are involved. The typical columnar liquid c ... more details
Infobox mineral name Carpathite category Organic mineral boxwidth boxbgcolor image Carpathite 258272.jpg imagesize caption Carpathite from New Idria District , California USA formula C sub 24 sub H sub 12 sub symmetry Monoclinic prismatic br H M symbol 2 m br Space group P 2 sub 1 sub a unit cell a 10.03 , b 4.69 , c 16.01 111 Z 2 molweight strunz 10.BA.30 color Yellow, yellowish brown on exposure habit Acicular to thin tabular in bladed groups and fibrous radiating aggregates system Monoclinic twinning cleavage Perfect on 001 , 100 and overline 2 01 fracture Splintery tenacity Flexible, nearly plastic mohs 1.5 luster Vitreous adamantine refractive n sub sub 1.760 1.780 n sub sub 1.780 1.982 n sub sub 2.050 2.150 opticalprop Biaxial birefringence 0.290 0.370 pleochroism streak Yellow white gravity 1.35 density melt fusibility diagnostic solubility diaphaneity Transparent other Fluorescent electric blue to blue green references ref name Mindat http www.mindat.org min 2162.html Mindat with location data ref ref name Webmineral http www.webmineral.com data Karpatite.shtml Webmineral data ref ref name HBM http rruff.geo.arizona.edu doclib hom karpatite.pdf Handbook of Mineralogy ref Carpathite also pendletonite and karpatite is a rare hydrocarbon mineral. It is the mineral form of the polycyclic aromatic hydrocarbon coronene with formula C sub 24 sub H sub 12 sub . It was first described in 1955 for an occurrence in Transcarpathian Oblast, Ukraine . It was named for the Carpathian Mountains . It has also been reported from the Presov Region of the Slovak Republic , the Kamchatka Oblast in Russia and from San Benito County, California . ref name Mindat It occurs at the contact zone of a diorite intrusive into argillite within cavities in the Ukraine. In the California occurrence it appears as a low temperature hydrothermal phase. It is associated with idrialite , amorphous organic material, calcite , barite , quartz , cinnabar and metacinnabar . ref name HB ... more details
Unreferenced date December 2009 C sub 24 sub class wikitable sortable Chemical formula Synonyms CAS number C sub 24 sub F sub 50 sub perfluorotetracosane 1766 41 2 C sub 24 sub H sub 12 sub coronene 191 07 1 C sub 24 sub H sub 12 sub N sub 4 sub anthracene tcnb 747 42 2 C sub 24 sub H sub 15 sub N sub 3 sub O sub 7 sub triphenylene picric acid 72454 49 0 C sub 24 sub H sub 18 sub O sub 6 sub diphenacyl isophthalate 116345 97 2 C sub 24 sub H sub 19 sub NO sub 5 sub oxyphenisatin acetate 115 33 3 C sub 24 sub H sub 20 sub dibenzoequinene 15129 78 9 C sub 24 sub H sub 20 sub BK potassium tetraphenyl boron 3244 41 5 C sub 24 sub H sub 20 sub BRb rubidium tetraphenyl boron 5971 93 7 C sub 24 sub H sub 20 sub SSn phenylthiotriphenyltin 1441 22 1 C sub 24 sub H sub 24 sub BN ammonium tetraphenyl boron 14637 34 4 C sub 24 sub H sub 24 sub N sub 2 sub O sub 4 sub nicocodine 3688 66 2 C sub 24 sub H sub 25 sub NO sub 3 sub benzylmorphine 14297 87 1 C sub 24 sub H sub 25 sub NO sub 4 sub flavoxate 15301 69 6 C sub 24 sub H sub 26 sub N sub 2 sub O sub 4 sub nicodicodine 808 24 2 C sub 24 sub H sub 27 sub N prenylamine 390 64 7 C sub 24 sub H sub 27 sub NO sub 2 sub levophenacylmorphan 10061 32 2 C sub 24 sub H sub 29 sub NO phenomorphan 468 07 5 C sub 24 sub H sub 30 sub O sub 4 sub dibenzyl sebacate 140 24 9 C sub 24 sub H sub 31 sub FO sub 5 sub triamcinolone acetonide 76 25 5 C sub 24 sub H sub 31 sub N undecylcyanobiphenyl 65860 74 4 C sub 24 sub H sub 31 sub NO dipipanone 467 83 4 C sub 24 sub H sub 31 sub N sub 3 sub O famprofazone 22881 35 2 C sub 24 sub H sub 31 sub N sub 3 sub OS butaperazine 653 03 2 C sub 24 sub H sub 31 sub N sub 3 sub O sub 2 sub S carphenazine 2622 30 2 C sub 24 sub H sub 32 sub O sub 4 sub estradiol dipropionate 309267 99 0 C sub 24 sub H sub 32 sub O sub 4 sub ethynodiol acetate 297 76 7 C sub 24 sub H sub 32 sub O sub 4 sub megestrol acetate 595 33 5 C sub 24 sub H sub 32 sub O sub 4 sub S spironolactone 52 01 7 C sub 24 sub H sub 33 sub NO s ... more details
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