Any of a class of compounds containing boron, carbon, and hydrogen. Buy high quality ocarborane 16872096 from carbosynth, your source for carbohydrates, nucleosides and fine chemicals. Elsevier inorganica chimica acta 240 1995 3778 the synthesis and structural characterization of carborane oligomers connected by carboncarbon and carbonboron bonds between icosahedra xiaoguang yang, wei jiang, carolyn b. They are also amongst the least basic, so their conjugate acids, hcarborane, are superacids i. Compare that to the ph of hcl about 1 and you get the idea of how strong. Stanko journal of structural chemistry volume 14, pages 959 963 1974cite this article. Basically carborane is isoelectronic with b12h12 2and when you work it out you find that there are bonding orbitals. Carter department of polymer science and engineering, university of massachusetts, amherst, massachusetts 01003 received july 30, 2009 revised manuscript received october 5, 2009. Synthesis of 3amino1carboxyocarborane and an improved. General description electron deficient boron cage compounds with one or more carbon atoms as a ligand in the borane framework. Strongest acid in the world carborane superacid vs an. Kahl department of pharmaceutical chemistry university of california, san francisco san francisco, ca 941430446 summary three procedures for the esterification of polyhedral carborane. Kahl department of pharmaceutical chemistry university of california, san francisco san francisco, ca 941430446 summary three procedures for the esterification of polyhedral carborane carboxylic acids. The isomerization of ocarborane to mcarborane which proceeds at normal pressure and 400c is completely suppressed at.
Carborane acids hcxb11y5z6 x, y, z h, alk, f, cl, br, cf3 are a class of superacids. Carborane acids hcxb 11 y 5 z 6 x, y, z h, alk, f, cl, br, cf 3 are a class of superacids, some of which are estimated to be at least one million times stronger than 100% sulfuric acid in terms of their hammett acidity function values h 0. Polyfluorenes have been widely investigated as active materials for polymer lightemitting diodes, sensors, and. Carboranebased metalorganic framework with high methane. Carborane definition of carborane by merriamwebster. Carborane polymers as well as small nido and closocarboranes, intermediate closocarboranes, and o, m, and pcarboranes are also discussed. Oct 08, 2017 strongest acid in the world carborane superacid vs an orange. Technically, the strongest acid ever created is a carborane acid. Autoplay when autoplay is enabled, a suggested video will automatically play next. Carborane acid was first discovered and synthesized by professor christopher reed and his colleagues in 2004 at the university of california, riverside. Teflon could also contain the second most powerful acid. Fun facts about acids the acid formed when milk is fermented to form yogurt is lactic acid.
When heated to decomposition it emits toxic vapors of boron. Carborane while we cant do an actual demo, because carborane is only available to the fbi, and we cant do a video on carborane, because so little is known about it, and the government doesnt want people on youtube to go out buying carborane, we do have a video on a really. The reaction system is no longer isolated in the apparatus used at 2500 mpa and. Streaming video is content sent in compressed form over the internet and displayed by the viewer in real time. Files available from the acs website may be downloaded for personal use only. The three common isomers are ocarborane, mcarborane and pcarborane 1the structure could be polyhedral or open cage.
Comparison of three methods for the synthesis of carborane. With streaming video or streaming media, a web user does not have to wait to download a file to play it. Carboraneacid hobbyist, traditional artist deviantart. Get your kindle here, or download a free kindle reading app. Strongest acid in the world carborane superacid vs an orange. Carboranes offers a comprehensive treatment of carborane chemistry and covers topics ranging from structures and chemical bonding to the degradation of the icosahedral cage.
The reason this is technically the worlds strongest acid is because its the strongest acid as a single molecule. Only the carborane acids, whose h0 could not be directly determined due to their. Any of a class of stable crystalline compounds composed of carbon, boron, and hydrogen. B10c2h12 a specific member of the class explanation of carborane superacid. Carboranebased metalorganic framework with high methane and.
Gasphase acidities of some neutral bronsted superacids. The strongest neutral isolable bronsted acid currently known is probably the perfluorinated version of carborane superacid. The bronsted acidity of carborane acids is analyzed via the molecular. Xn risk statements about 1,2dicarbadodecaborane12 cas no.
Icosahedral carborane superacids and their conjugate bases. I am honestly just very curious as to what the strongest acid is. Inspire your inbox sign up for daily fun facts about this day in history, updates, and special offers. Carborane superacid definition of carborane superacid by. This request for quotation will be sent to the supplier directly.
Nevertheless, it is also an extremely gentle acidbecause its conjugate base engages in so little chemistry. Tjarks, carborane clusters in computational drug design. Carborane photochemistry triggered by aryl substitution. Acidity scale measurements indicate that hchb11cl11 is. Carborane superacid synonyms, carborane superacid pronunciation, carborane superacid translation, english dictionary definition of carborane superacid. Although the chemistry of carboranes as anions has a relatively long ca 40 years history, the first actual carborane based weighable and measurable superacids i. However, by far the strongest intrinsic bronsted acidity. Nmr spectroscopy of 12carboranes and their derivatives. Carboranes, second edition is designed as a comprehensive source of information in a field that has experienced enormous growth in both its fundamental and applied aspects in the four decades since the publication of carboranes 1970.
Whats the ph value of carborane superacid hchb11 cl11, the worlds strongest acid. Carborane superacid article about carborane superacid by. Fluoroantimonic acid is an inorganic compound with the chemical formula h 2fsbf 6 it is an. This is an extremely sensitive to moisture solid which was prepared by a treatment of the c 2 h 5 3 sihsic 2 h 5 3chb 11 f 11 compound with the anhydrous hcl. The carborane superacids may be considered the worlds strongest solo acid, as fluoroantimonic acid is actually a mixture of hydrofluoric acid. Buy high quality o carborane 16872096 from carbosynth, your source for carbohydrates, nucleosides and fine chemicals. Let us know what else youd like us to destroy next in the comments. Inside chemistry labs, chemists work with what they call superacids. Whats the ph value of carborane superacid hchb11 cl11. This suggests that the incorporation of carborane is extending the conjugation length of the fluorene segments between the cages figure 1.
A video purporting to show an iphone battling it out with superacid shows some interesting chemistry, but its not what you might think. The synthesis and structural characterization of carborane. Sadly, carborane is rather rare, and likely wont be making a wide appearance in chemistry classes anytime soon. Jun 14, 1999 the overall yield of 1 from ocarborane 5 using this procedure was. Use of the information, documents and data from the echa website is subject to the terms and conditions of this legal notice, and subject to other binding limitations provided for under applicable law, the information, documents and data made available on the echa website may be reproduced, distributed andor used, totally or in part, for noncommercial purposes provided that echa is. In coordination chemistry, it is used as unique bulky ligand scaffolds. It was reported last year that the carborane superacid hchb 11 f 11 see fig. Much stronger acids the acids that melt through tables can be created by mixing certain antimony compounds with hydrofluoric acid hf. It reacts readily with alkenes or alkynes to give a variety of cage b3.
For the preparation of various carborane anions, and various reagents based on carborane anions, see supporting information in accounts chem. The icosahedral chargeneutral closocarboranes, 1,2, 1,7, and 1,12c 2 b 10 h 12 respectively ortho, meta, and paracarborane in the informal nomenclature are particularly stable and are commercially available. We put some chlorosulfonic superacid in a bowl of aluminium foil, added a little water for good measure and watched the chaos ensue. Instead, the media is sent in a continuous stream of data and is played as it arrives. How buffers are used when streaming a video from the. When heated to decomposition it emits toxic vapors of b. Although the chemistry of carboranes as anions has a relatively long ca 40 years history, the first actual carboranebased weighable and measurable superacids i. As the first step of a research program aimed at developing a bispecific monoclonal antibody system for the delivery of boronrich molecules to tumor cells for boron neutron capture therapy, monoclonal antibodies mabs were produced against an anionic nido carborane derivative, 47,8dicarbadodecahydroundecaborat17ylbutanoic acid. Superacid chlorosulfonic acid attacks chicken breast let me know in the comments what else youd like to see destroyed by science. Carborane definition of carborane by the free dictionary. The three common isomers are o carborane, m carborane and p carborane 1the structure could be polyhedral or open cage. A strong superacid of this kind is fluoroantimonic acid.
Transformations of isopropenylocarborane and ocarborane. G acid 209 kcalmol for dodecafluorosubstituted carborane acid cb 11 f 12 h is predicted to exceed the intrinsic acidity of sulfuric acid by about 90 kcalmol or by almost 70 powers of ten, whereas semiempirical pm3 calculations suggest that the conjugate acid of the. For all you nerdy chemistry people out there so the majority of the people reading this. How well can the good old nexus 5 hold up against our chlorosulfonic super acid. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. As the first step of a research program aimed at developing a bispecific monoclonal antibody system for the delivery of boronrich molecules to tumor cells for boron neutron capture therapy, monoclonal antibodies mabs were produced against an anionic nidocarborane derivative, 47,8dicarbadodecahydroundecaborat17ylbutanoic acid. Acidity scale measurements indicate that hchb 11cl 11 is the strongest pure bronsted acid presently known, surpassing triflic and fluorosulfuric acid.
How does fluoroantimonic acid react to an iphone 7. Science, chemistry, homework, acid, carborane acid email this topic print this page. Carborane article about carborane by the free dictionary. For the first time g2 or g2mp2 calculations or both have been performed to calculate the acidity and deprotonation enthalpy of classical strong mineral acids hclo4, cf3so3h, fso3h, h2so4, hbf4, hpo3, and hno3. Benzenium ion chemistry on solid metal halide superacids. The synthesis of polyfluorene with o carborane in the backbone has been reported. Carborane, any member of a class of organometallic compounds containing carbon c, boron b, and hydrogen h. A cucarboranebased metalorganic framework mof, nu5, which contains a quasispherical paracarborane moiety, has been synthesized and characterized. Preparation and properties of nidocarboranespecific. The compound, called a carborane acid, is the first superacid that can be stored in a bottle, say its creators. Prior to carborane acids discovery, the longstanding record of strongest acids as single isolable compounds was held by the two superacids, fluorosulfonic acid and trifluoromethanesulfonic acid, with pk a s of. The synthesis of polyfluorene with ocarborane in the backbone has been reported. Not all of them are corrosive, for instance carborane superacid is a very strong acid but. Technically carborane is the worlds strongest solo acid because fluoroantimonic acid is a mixture of antimony pentafluoride and hydrofluoric acid.
Another group of superacids, the carborane acid group, contains some of the strongest known acids. Is there a video by khan academy on doing logs without a calculator. The overall yield of 1 from ocarborane 5 using this procedure was. This can be ascribed to the highly polarized cage c b multiple bond, which lowers the activation barriers of.
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