This chemical compound can dissolve in water to form hydroastatic acid, which exhibits properties very similar to the other five binary acids, and is in fact the strongest among them. However, it is limited in use due to its ready decomposition into elemental hydrogen and astatine,[4] as well as the short half-life of the various isotopes of astatine. Because the atoms have a nearly equal electronegativity, and as the At+ ion has been observed,[5] dissociation could easily result in the hydrogen carrying the negative charge. Thus, a hydrogen astatide sample can undergo the following reaction:
2 HAt → H+ + At− + H− + At+ → H2 + At2
This results in elemental hydrogen gas and astatine precipitate. Further, a trend for hydrogen halides, or HX, is that enthalpy of formation becomes less negative, i.e., decreases in magnitude but increases in absolute terms, as the halide becomes larger. Whereas hydroiodic acid solutions are stable, the hydronium-astatide solution is clearly less stable than the water-hydrogen-astatine system. Finally, radiolysis from astatine nuclei could sever the H–At bonds.
Additionally, astatine has no stable isotopes. The most stable is astatine-210, which has a half-life of approximately 8.1 hours, making its chemical compounds especially difficult to work with,[6] as the astatine will quickly decay into other elements.
Preparation
Hydrogen astatide can be produced by reacting astatine with hydrocarbons (such as ethane):[7]
C2H6 + At2 → C2H5At + HAt
References
^Henri A. Favre; Warren H. Powell, eds. (2014). Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013. Cambridge: The Royal Society of Chemistry. p. 131.
^Analytical Chemistry of Technetium, Promethium, Astatine and Francium by Avgusta Konstantinovna. Lavrukhina, Aleksandr Aleksandrovich Pozdnyakov ISBN0250399237
^PubChem, "astatane - Compound Summary", accessed July 3, 2009.
^Fairbrother, Peter, "Re: Is hydroastatic acid possible?", accessed July 3, 2009.
^Advances in Inorganic Chemistry, Volume 6 by Emeleus, p.219, Academic Press, 1964 ISBN0-12-023606-0
^Gagnon, Steve, "It's Elemental", accessed July 3, 2009.
^Hagen, A. P. (1989). The formation of bonds to halogens. New York: VCH Publishers. ISBN978-0-470-14538-8. OCLC 472256324.
December 28, 2022
hydrogen, astatide, redirects, here, hats, also, known, astatine, hydride, astatane, astidohydrogen, hydroastatic, acid, chemical, compound, with, chemical, formula, consisting, astatine, atom, covalently, bonded, hydrogen, atom, thus, hydrogen, halide, namesi. HAt redirects here For hats see Hat Hydrogen astatide also known as astatine hydride astatane astidohydrogen or hydroastatic acid is a chemical compound with the chemical formula HAt consisting of an astatine atom covalently bonded to a hydrogen atom 3 It thus is a hydrogen halide Hydrogen astatide NamesIUPAC name Astatane 1 IdentifiersCAS Number 13464 71 6 Y3D model JSmol Interactive imageChEBI CHEBI 30418 YChemSpider 22432 YGmelin Reference 532398PubChem CID 23996CompTox Dashboard EPA DTXSID10274755InChI InChI 1S AtH h1H YKey PGLQOBBPBPTBQS UHFFFAOYSA N YInChI 1 AtH h1HKey PGLQOBBPBPTBQS UHFFFAOYAGSMILES AtH PropertiesChemical formula HAtMolar mass 211 g molBoiling point 3 C 27 F 270 K estimated 2 Solubility in water SolubleConjugate acid AstatoniumConjugate base AstatideRelated compoundsOther anions Hydrogen bromideHydrogen chlorideHydrogen fluorideHydrogen iodideExcept where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa Y verify what is Y N Infobox references This chemical compound can dissolve in water to form hydroastatic acid which exhibits properties very similar to the other five binary acids and is in fact the strongest among them However it is limited in use due to its ready decomposition into elemental hydrogen and astatine 4 as well as the short half life of the various isotopes of astatine Because the atoms have a nearly equal electronegativity and as the At ion has been observed 5 dissociation could easily result in the hydrogen carrying the negative charge Thus a hydrogen astatide sample can undergo the following reaction 2 HAt H At H At H2 At2This results in elemental hydrogen gas and astatine precipitate Further a trend for hydrogen halides or HX is that enthalpy of formation becomes less negative i e decreases in magnitude but increases in absolute terms as the halide becomes larger Whereas hydroiodic acid solutions are stable the hydronium astatide solution is clearly less stable than the water hydrogen astatine system Finally radiolysis from astatine nuclei could sever the H At bonds Additionally astatine has no stable isotopes The most stable is astatine 210 which has a half life of approximately 8 1 hours making its chemical compounds especially difficult to work with 6 as the astatine will quickly decay into other elements Preparation EditHydrogen astatide can be produced by reacting astatine with hydrocarbons such as ethane 7 C2H6 At2 C2H5At HAtReferences Edit Henri A Favre Warren H Powell eds 2014 Nomenclature of Organic Chemistry IUPAC Recommendations and Preferred Names 2013 Cambridge The Royal Society of Chemistry p 131 Analytical Chemistry of Technetium Promethium Astatine and Francium by Avgusta Konstantinovna Lavrukhina Aleksandr Aleksandrovich Pozdnyakov ISBN 0250399237 PubChem astatane Compound Summary accessed July 3 2009 Fairbrother Peter Re Is hydroastatic acid possible accessed July 3 2009 Advances in Inorganic Chemistry Volume 6 by Emeleus p 219 Academic Press 1964 ISBN 0 12 023606 0 Gagnon Steve It s Elemental accessed July 3 2009 Hagen A P 1989 The formation of bonds to halogens New York VCH Publishers ISBN 978 0 470 14538 8 OCLC 472256324 Retrieved from https en wikipedia org w index php title Hydrogen astatide amp oldid 1119856845, wikipedia, wiki, book, books, library,
