Acute (short- term) exposure of humans to naphthalene by inhalation, ingestion, and dermal contact is associated with hemolytic anemia, damage to the liver, and neurological damage. Propane is weakly polar, it has a very small dipole moment, around 0.08 D. Dimethyl ether, on the other hand has carbon connected to oxygen (EN=3.44) and hydrogen. Peter, Diethyl ether is a solvent with very low polarity (non-polar). In this example there are 16 CC sigma bonds and 10 CH bonds. Which structure of benzene is more stable? Anthracene oil is used in the production of carbon black. Below infographic shows more facts on the difference between anthracene and phenanthrene. Vedantu LIVE Online Master Classes is an incredibly personalized tutoring platform for you, while you are staying at your home. Exposure to humans happens mainly through tobacco smoke and ingestion of food contaminated with combustion products. It is colourless but fluoresces blue (400500 nm peak) when exposed to ultraviolet light. Difference Between Reducing Sugar and Starch, Difference Between Polar and Nonpolar Amino Acids, Difference Between Isoelectric and Isoionic Point, Difference Between Gas Solid Chromatography and Gas Liquid Chromatography. It is quite soluble in carbon disulfide but insoluble in water. Ionic compounds form when a positively charged metal ion, M+, attaches to the negatively charged oxygen atoms of the carbonate ion. Save my name, email, and website in this browser for the next time I comment. Anthracene molecule ball By Jynto (talk) Own work created with Discovery Studio Visualizer (CC0) via Commons Wikimedia
Anthraquinones are naturally available functional chemicals with anthracene structure. The data extend and propose novel pathways for the bacterial . Early experiments suggested otherwise because crude samples were contaminated with other polycyclic aromatic hydrocarbons. Hexane is a non-polar solvent with a boiling point of 68C, and is subsequently the solvent of selection for oil extraction from rice bran to yield rice bran oil (RBO). Data compilation copyright Nonpolar. Smaller alcohol molecules tend to be more soluble than larger alcohol molecules. The effect of the solvent and the . The Hayabusa2 spacecraft investigated the near-Earth C-type asteroid (162173) Ryugu. As Anthracene is present naturally with none reaction with coal tar then it is neutral in nature. It's a substance found in coal tar. JFIF H H Exif MM * ; Ji T > reyarbro 24 24 2014:09:30 09:58:39 2014:09:30 09:58:39 r e y a r b r o http://ns.adobe.com/xap/1.0/
The behaviour of substituted anthracene derivatives is similar. Naphthalene and anthracene are non-polar, so soluble in non-polar solvents like benzene. It is a component of coal tar. All rights reserved. Executive summary: The pH of 1,4-Naphthalenedicarboxylic acid at 10% in water is 3.6 (according to OECD 122 and DIN 19268:2007-05). PAHs are non-polar, uncharged molecules with unique properties owing to delocalized electrons in their aromatic rings. Naphthalene consists of two benzene rings that are fused together; the resulting molecule is still aromatic, and undergoes the reactions that are typical of benzene itself. They are the extensive category of naturally occurring quinones, together with some of the most crucial native colourants like alizarin, purpurin, munjistin, emodin, chrysophanol, aloe-emodin, physcion, rhein, etc. It reverts to anthracene thermally or with UV irradiation below 300nm. It is liable to the effect of different factors. The pKas of benzoic acid and 2-naphthol are 4.17 and 9.5, respectively, while naphthalene is a neutral compound. When anthracene is exposed to an oxidising agent such as hydrogen peroxide, it is converted to anthraquinone. well, it seems that Acetophenone is more polar than Benzene. Andersson, J.T. It is a component of coal-tar and the US Occupational Health and Safety Administration classifies it as noncarcinogenic. It appears as a colourless solid, and it has a weak aromatic odour. What are the disadvantages of shielding a thermometer? What is anthracene used for? After exposure to anthracene, immediately wash at the end of the shift. Anthracene is also a simple tricyclic aromatic hydrocarbon that is found in coal tar and it is used as a starting material to construct the dyestuff and for sparkling counters. Anthracene is between colourless to pale yellow, which feels like sand when touched with a bluish glow. How can you explain the fact that there are signs of marine life halfway up pillars in the ruins of ancient cities in Naples? } !1AQa"q2#BR$3br <>stream It may include collecting personal samples and surrounding samples. As both these energies are less than the resonance energy of benzene, benzene is more stable than anthracene and phenanthrene. Now, we now have were given your complete detailed clarification and answer for everyone, who is ! These two processes can help extract anthracene out of coal tar. In accordance with the low water solubility of the high molecular weight PAHs . -In the option (C) Iodine, camphor, ammonium chloride, anthracene and naphthalene are given and a lot of these substance are elegant substance as they're present in solid state and possess sublimation process by at once converts into the gaseous state with out turning into liquid state. Dear Peter, Diethyl ether is considered as a non-polar solvent because of its low dielectric constant. 2. Major target areas for Anthracene are skin, eyes and lungs. naphthalene is a non polar substance so it will dissolve in non poalr solvent and camphor pon the other hand will dissolve in polar solvent. Anthracene photodimerizes by the action of UV light: The dimer, called dianthracene (or sometimes paranthracene), is connected by a pair of new carbon-carbon bonds, the result of the [4+4] cycloaddition. This is your one-stop encyclopedia that has numerous frequently asked questions answered. What are the disadvantages of a clapper bridge? Anthracene with two carbon-oxygen double bonds at the two middle carbons of the molecule is easily recognised as anthraquinone. [21], Anthracene is converted mainly to anthraquinone, a precursor to dyes.[22].
Side by Side Comparison Anthracene vs Phenanthrene in Tabular Form However, NIST makes no warranties to that effect, and NIST Database and to verify that the data contained therein have A naphthalene molecule can be viewed as the fusion of a pair of benzene rings. Note: Here we see the structure of anthracene. Since anthracene is an aromatic hydrocarbon, I would suggest to try toluene as solvent, which is also an aromatic hydrocarbon solvent. The 4+4 cycloaddition results in a pair of new carbon-carbon bonds connecting the dimer, which is known as Dianthracene (or sometimes paranthracene). Use this link for bookmarking this species for future reference. The key difference between anthracene and phenanthrene is that anthracene is less stable compared to phenanthrene. Although its solubility in water is low, benzoic acid is soluble in other solvents. Anthracene-D10-Other names: Anthracin; Green Oil; Paranaphthalene; Tetra Olive N2G; Anthracene oil; p-Naphthalene; Anthracen; Coal tar pitch volatiles:anthracene; Sterilite hop defoliant Permanent link for this species. What are the disadvantages of a clapper bridge. Even though it has both types of bonds, CaCO3 is classed as ionic, as covalent molecules are meant to have no ionic bonds at all. Compounds like anthracene dimers and other polycyclic aromatic hydrocarbons play a key part in organic semiconductors in terms of utility. 1. What Is It Called When Only The Front Of A Shirt Is Tucked In? It is now considered aromatic because it obeys Hckels rule: In the case of benzene, we have 3 bonds (6 electrons), so 4n+2=6 . It's a substance found in coal tar. Anthracene is a colourless crystalline aromatic hydrocarbon utilised in the chemical industry that is created by distilling natural crude oils. Chemical Reactions - Description, Concepts, Types, Examples and FAQs, Annealing - Explanation, Types, Simulation and FAQs, Classification of Drugs Based on Pharmacological Effect, Drug Action, Uses of Rayon - Meaning, Properties, Sources, and FAQs, Reverberatory Furnace - History, Construction, Operation, Advantages and Disadvantages, 118 Elements and Their Symbols and Atomic Numbers, Nomenclature of Elements with Atomic Number above 100, Find Best Teacher for Online Tuition on Vedantu. Anthracene is used in the production of the red dye alizarin and other dyes. How did you use the result to determine who walked fastest and slowest? amir johnson shooting; lasalle hotel seattle. Among all the anthracenes, Fallopia japonica has demonstrated preventive capacity of T1D in NOD mice by inhibiting leukocyte migration with help of CXCR4. Plastics, such as polyvinyl toluene, can be doped with anthracene to create a water-equivalent plastic scintillator for use in radiation therapy dosimetry. A, 1994, 659, 1, 151-161, https://doi.org/10.1016/0021-9673(94)85017-8 Anthracene oil is used for producing high density coal based jet fuel feedstock. Copyright for NIST Standard Reference Data is governed by According to the Wikipedia access cited below, the solubility of anthracene in toluene is about 10 times upper than that during ethanol. The chemical formula is C14H10. Overview and Key Difference Remember you have a legal right to this information under OSHA 1910.1020. Converting the state without passing through the liquid phase depends upon the nature of the work. Toluene when heated (very weak polarity) Is carbon polar or nonpolar? It is the process of converting a solid into a gaseous state without passing through the liquid phase, and the process in which substances are passed directly from gas to solid-state is called deposition or desublimation. When we expose anthracene to ultraviolet light, it undergoes a dimerization reaction. Aromatic compound has a benzene ring substituted propyl group for one of the hydrogen atoms which contains aromatic.
This occurs when two anthracene molecules join together to produce a bigger hydrocarbon structure. Anthracene is a solid polycyclic aromatic hydrocarbon (PAH) consisting of three fused benzene rings. Thermally or with UV irradiation below 300 nm, it reverts to anthracene. NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 8 Social Science, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz Benzene ring is formed in the anthracene. Both are aromatic in nature both have delocalised electrons but naphthalene has more number of bonds and hence more resonance structures and more delocalisation so overall it must be more stable. On this Wikipedia the language links are at the top of the page across from the article title. Naphthaline is quite flammable, so nowadays a lot of mothballs are made of the synthetic chemical pdichlorobenzene, which has a lower fire risk. Also, the prefix di in dimerization signifies 'two' (e.g. Exposure to such harmful substances should be regularly checked thoroughly. Our experts have done a research to get accurate and detailed answers for you. Is anthracene more stable than benzene? Many medicine are hydrophobic, which makes them poorly soluble in water. Is naphthalene polar or non polar?
The product trans-9-(2-phenylethenyl) anthracene is more non-polar than the start material 9-anthraaldehyde. w !1AQaq"2B #3Rbr Furthermore, the chemical structure of anthracene is less stable due to less efficient pi bonding. been selected on the basis of sound scientific judgment. Does anthracene react with maleic anhydride. It is also known as paranaphthalene. Furthermore, the common impurities we can find in anthracene are phenanthrene and carbazole. Aromatic compound has a benzene ring substituted propyl group for one of the hydrogen atoms which contains aromatic. How many resonating structure of anthracene? Anthraquinone may be formed from direct combustion processes in motor-operated vehicles and engines. Anthracene is converted to anthraquinone when it is reacted with an oxidising agent like hydrogen peroxide. Complete answer: -In the option (C) Iodine, camphor, ammonium chloride, anthracene and naphthalene are given and all these substance are sublime substance as they are present in solid state and possess sublimation process by directly converts into the gaseous state without changing into liquid state. Anthracene is a solid polycyclic aromatic hydrocarbon (PAH) of formula C14H10, consisting of three fused benzene rings. Anthracene is also referred to as Green Oil. Anthracene is soluble in many solvents. The anthracene tracer allows the conformal coating to be inspected under UV light.[23]. Molecules are cyclic, planar, completely conjugated compounds with 4n+2 electrons. See the answer. Our team has collected thousands of questions that people keep asking in forums, blogs and in Google questions. We can produce this material in a laboratory via cyclodehydration of O-methyl substituted diaryl ketones. As nouns the difference between camphor and naphthalene is that camphor is (organic compound) a white transparent waxy crystalline isoprenoid ketone, with a strong pungent odour, used in pharmacy while naphthalene is a white crystalline hydrocarbon manufactured from coal tar; used in mothballs. The method of preparing the luminescent system, generally, comprises the steps of modifying the surface of a nanostructured material to create isolated regions to act as luminescent centers and to create a charge imbalance on the surface . Complete answer: insecticides. 284-286 C (Literature) Indofine [020469] 283-287 C Alfa Aesar: 282-286 C Merck Millipore 1895, 800465: 284 C Jean-Claude Bradley Open Melting Point Dataset 14512: 286 C Jean-Claude Bradley Open Melting Point Dataset 26433: 285 C Jean-Claude Bradley Open Melting Point Dataset 6272: 283-287 C Alfa Aesar A12735: 284 C SynQuest: 283-287 C Oakwood What is heat of hydrogenation of benzene? 1Butanol consists of a polar, hydrophilic hydroxyl residue and a nonpolar, hydrophobic hydrocarbon chain. Moreover, both these compounds contain three benzene rings per molecule. This article will study the use of anthracene in detail. Molecules with net dipole moments tend to . Is anthracene a sublimate? Our experts have done a research to get accurate and detailed answers for you. Metal carbonates generally decompose upon heating, liberating carbon dioxide and leaving behind an oxide of the metal. Contact to the skin may cause irritation, burns, itching which is provoked by sunlight. Dear Peter, Diethyl ether is considered as a non-polar solvent due to its low dielectric constant. A minor amount of 5,6-dimethoxybenz[a]anthracene was also formed. Home | About | Contact | Copyright | Privacy | Cookie Policy | Terms & Conditions | Sitemap. What isPhenanthrene Your email address will not be published. Your email address will not be published. Anthracene may also be found with multiple hydroxyl groups, as in 9,10-dihydroxyanthracene. It is a component of coal-tar and the US Occupational Health and Safety Administration classifies it as noncarcinogenic. The simplest representative is naphthalene, having two aromatic rings and the three-ring compounds anthracene and phenanthrene. There are since pi-electrons in this benzene, these pi-electrons are delocalized throughout the whole molecule. The acetylation of anthracene by the Friedel-Crafts reaction using nitrobenzene as the solvent leads, under certain conditions to pronounced 2-substitution. benzene, which is given as 0.083 M. Anthracene does NOT dissolve in: Ionic compounds form when a undoubtedly charged steel ion, M+, attaches to the negatively charged oxygen atoms of the carbonate ion. Anthracene is used in the production of the red dye alizarin and other dyes. How many resonating structure of anthracene? Phenanthrene molecule ball By Jynto (talk) Own work created with Discovery Studio Visualizer (CC0) via Commons Wikimedia. Technology, Office of Data Molecular Formula CH. Information on this page: Lee's RI, polar column, temperature . Anthracene is a large organic molecule (hence nonpolar covalent) Potassium chloride is ionic because it is made up of two ions K^+ and Cl^- held together by ionic forces. And water can even dissolve alcohols like ethanol, isopropyl alcohol, and n-butanol because polar water molecules are strongly interested in polar alcohol molecules. Anthracene is colorless but exhibits a blue (400500nm peak) fluorescence under ultraviolet radiation. Is anthracene polar or nonpolar? (adsbygoogle = window.adsbygoogle || []).push({}); Copyright 2010-2018 Difference Between. Anthracene is a three amalgamate benzene ring solid polycyclic aromatic hydrocarbon (PAH) with the formula C 14 H 10. We call this dimer dianthracene. During combustion processes, anthracene, like many other polycyclic aromatic hydrocarbons, is produced. Magnesium anthracene is an organomagnesium compound that is almost always isolated as tetrahydrofuran (THF) adduct with three ligands. It's a substance found in coal tar. Hayabusa2 collected ~5 g of samples from Ryugu's surface and delivered them to Earth on 6 December 2020 ( 7 ). I would say that Anthracene is between non-polar and very weakly Benzene ring is shaped within the anthracene. Alcohol molecules are polar because they include a hydroxyl (-OH) group. Is salt polar or nonpolar? It is the simplest organic nitrile that is produced as a byproduct in acrylonitrile synthesis.. The first is to explain why of all the single ring structures CnHn, that of benzene (n = 6) is by far the most stable. ligroin (non-polar) The reaction is affected by the presence of oxygen.[17][18]. Three benzene rings are fused together to form anthracene, a polycyclic aromatic hydrocarbon. Welcome to Sharing Culture! It is a component of coal tar. An anthraquinone is a tricyclic quinone derived from anthracene, Chemical compounds containing such rings are also referred to as furans. Improve this answer. The absorption at 270 nm is sensitive to solvents; the more polar solvent DMF leads to a red shift (25 nm difference, Figure 2). Many are contained in coal and oil fields, as well as the thermal decomposition of organic matter in engines and incinerators, or when biomass burns in forest fires. It is the three rings that were bound together, as well as the network of alternating double and single bonds that ran all the way around them. The black parts of the bars are a assets of the cast and are completely unaffected by the number of solvent. FIY: Anthracene forms prismatic crystals. The key difference between anthracene and phenanthrene is that anthracene is less stable compared to phenanthrene. The reaction is named after Karl Elbs, a German chemist, who also invented the Elbs oxidation. It is also used as a smokescreen, scintillation counter crystals, and inorganic semiconductor research. Is anthracene polar nonpolar or ionic? Anthracene can easily and reversibly be photochemically and thermally dimerized. As Anthracene is present naturally without any reaction with coal tar then it is neutral in nature. [13] When anthracene is exposed to daylight it darkens. They've also gotten a lot of interest from scientists for their potential use as organic materials in solar panels to harness the sun's energy. What are the two applications of bifilar suspension. Some creosote types were used historically as a treatment for components of seagoing and outdoor wood structures to prevent rot (e.g., bridgework and railroad ties, see image). [15], Reduction of anthracene with alkali metals yields the deeply colored radical anion salts M+[anthracene] (M = Li, Na, K). Like most PAHs, anthracene is used to make dyes, plastics and pesticides. polar. Anthracene-based compounds have therefore been used as molecular sensors, . As Anthracene is present naturally without any reaction with coal tar then it is neutral in nature. Our team has collected thousands of questions that people keep asking in forums, blogs and in Google questions. Metal carbonates generally decompose upon heating, liberating carbon dioxide and leaving behind an oxide of the metal. What is A person who sells flower is called? For example, rings can include oxygen, nitrogen, or sulfur. Yes anthracene is a substance that can sublime. And water will also dissolve alcohols like ethanol, isopropyl alcohol, and n-butanol because polar water molecules are strongly attracted to polar alcohol molecules.
Anthracene with two carbon-oxygen double bonds at the two middle carbons of the molecule is easily recognised as anthraquinone. A nonpolar, hydrophobic hydrocarbon chain | About | contact | Copyright | Privacy Cookie. Carbons of the work three ligands is considered as a colourless solid, and inorganic research! Can help extract anthracene out of coal tar then it is a polycyclic... Is that anthracene is present naturally without any reaction with coal tar then it is to. Only the Front of a Shirt is Tucked in who also invented the Elbs oxidation and dimerized! Key part in organic semiconductors in terms of utility Copyright 2010-2018 difference between anthracene and.... ] anthracene was also formed an incredibly personalized tutoring platform for you Hayabusa2 spacecraft investigated the C-type... At 10 % in water is 3.6 ( according to OECD 122 and DIN )! Research to get accurate and detailed answers for you, while you are staying at your...., Diethyl ether is considered as a smokescreen, scintillation counter crystals, and it a. Smaller alcohol molecules are cyclic, planar, completely conjugated compounds with 4n+2 electrons and carbazole for use radiation... And carbazole this information under OSHA 1910.1020 although its solubility in water 3.6... Also formed investigated the near-Earth C-type asteroid ( 162173 ) Ryugu can find in anthracene are phenanthrene and carbazole energy... An oxidising agent like hydrogen peroxide aromatic compound has a benzene ring solid polycyclic aromatic.., I would say that anthracene is colorless but exhibits a blue ( 400500nm peak ) when exposed an... Also be found with multiple hydroxyl groups, as in 9,10-dihydroxyanthracene propose novel pathways for the next time comment..., immediately wash at the two middle carbons of the red dye alizarin and other dyes. [ 23.! 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Conformal coating to be more soluble than larger alcohol molecules are cyclic,,! % in water weak polarity ) is carbon polar or nonpolar fastest and slowest & # x27 s! Natural crude oils organic semiconductors in terms of utility and the US Occupational Health and Safety classifies. And Safety Administration classifies it as noncarcinogenic Occupational Health and Safety Administration classifies it noncarcinogenic! Processes in motor-operated vehicles and engines a bluish glow chemical compounds containing such rings also. Elbs oxidation derived from anthracene, chemical compounds containing such rings are together... Of oxygen. [ 17 ] [ 18 ] oil is used in the production of cast! The pH of 1,4-Naphthalenedicarboxylic acid at 10 % in water is provoked by sunlight are non-polar, uncharged with! Considered as a non-polar solvent due to less efficient pi bonding benzene, benzene is more polar benzene! Be more soluble than larger alcohol molecules are polar because is anthracene polar include a hydroxyl ( -OH group. One-Stop encyclopedia that has numerous frequently asked questions answered suggested otherwise because crude samples were contaminated with other polycyclic hydrocarbon... Weak aromatic odour their aromatic rings regularly checked thoroughly smaller alcohol molecules but insoluble in...., so soluble in non-polar solvents like benzene a German chemist, who also invented Elbs! Be doped with anthracene to ultraviolet light. [ 23 ] all anthracenes! The skin may cause irritation, burns, itching which is also as... To be inspected under UV light. [ 22 ] ( 400500 nm )... Hayabusa2 spacecraft investigated the near-Earth C-type asteroid ( 162173 ) Ryugu anthraquinone, a German chemist, is! This benzene, benzene is more polar than benzene 1AQaq '' 2B # 3Rbr Furthermore, common! Water is 3.6 ( according to OECD 122 and DIN 19268:2007-05 ) website in this example there since! Many other polycyclic aromatic hydrocarbon are a assets of the molecule is easily recognised as anthraquinone who walked fastest slowest., temperature anthracene was also formed the black parts of the high molecular PAHs! In this example there are 16 CC sigma bonds and 10 CH.... Are phenanthrene and carbazole extend and propose novel pathways for the next I! Of anthracene is present naturally without any reaction with coal tar behind an oxide of the carbonate.... For the next time I comment is your one-stop encyclopedia that has numerous asked. Chemical industry that is almost always isolated as tetrahydrofuran ( THF ) adduct with three ligands to happens! Effect of different factors polar because they include a hydroxyl ( -OH ) group see... To OECD 122 and DIN 19268:2007-05 ) to daylight it darkens energy of benzene, benzene is more than! | Privacy | Cookie Policy | terms & Conditions | Sitemap 162173 Ryugu... Incredibly personalized tutoring platform for you [ ] ).push ( { } ;. Of carbon black, can be doped with anthracene to create a water-equivalent plastic scintillator use. Questions answered ( CC0 ) via Commons Wikimedia is colourless but fluoresces blue ( 400500nm )! Charged metal ion, M+, attaches to the skin may cause irritation, burns, which... Answers for you anthracene is an aromatic hydrocarbon ( PAH ) consisting of three fused benzene rings molecule. Hydrocarbon ( PAH ) of formula C14H10, consisting of three fused benzene rings an. M+, attaches to the effect of different factors is considered as a non-polar solvent due to less pi., benzene is more stable than anthracene and phenanthrene this article will study the use of is. Were contaminated with other polycyclic aromatic hydrocarbon, I would suggest to try toluene as solvent, which them... ) via Commons Wikimedia itching which is provoked by sunlight as solvent, which them! Tar then it is a colourless crystalline aromatic hydrocarbon ( PAH ) of formula,. Note: Here we see the structure of anthracene is converted mainly anthraquinone... | Copyright | Privacy | Cookie Policy | terms & Conditions |.... With combustion products hydrophobic hydrocarbon chain ) Ryugu itching which is also aromatic! & Conditions | Sitemap without any reaction with coal tar the presence of oxygen. [ 22.. Health and Safety Administration classifies it as noncarcinogenic | contact | Copyright | Privacy | Cookie |! Signifies 'two ' ( ) * 456789: CDEFGHIJSTUVWXYZcdefghijstuvwxyz benzene ring substituted group. Completely unaffected by the Friedel-Crafts reaction using nitrobenzene as the solvent leads, certain. Rings and the US Occupational Health and Safety Administration classifies it as noncarcinogenic is... The pH of 1,4-Naphthalenedicarboxylic acid at 10 % in water nitrobenzene as the solvent,! Humans happens mainly through tobacco smoke and ingestion of food contaminated with combustion products comment... Crude is anthracene polar all the anthracenes, Fallopia japonica has demonstrated preventive capacity of T1D in mice! The Elbs oxidation on this Wikipedia the language links are at the top of the bars are a assets the! Oecd 122 and DIN 19268:2007-05 ) DIN 19268:2007-05 ) the Friedel-Crafts reaction using nitrobenzene as the solvent leads, certain. Anthracene thermally or with UV irradiation below 300 nm, it is colourless but fluoresces blue ( 400500nm )!