Hydrogen astatide: Difference between revisions
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{{short description|Chemical compound}} |
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{{redirect|HAt| |
{{redirect|HAt|other uses|Hat (disambiguation)}} |
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| SystematicName = Astatane<ref>{{cite book|title=Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013|editor=Henri A. Favre|editor2=Warren H. Powell|date=2014|publisher=The [[Royal Society of Chemistry]]|place=Cambridge|page=131}}</ref> |
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|IUPACName=Hydrogen astatide<ref>{{cite web | url=https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:30418 | title=Hydrogen astatide (CHEBI:30418) }}</ref> |
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| verifiedrevid = 476999076 |
| verifiedrevid = 476999076 |
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| ImageNameL1 = Ball-and-stick model of hydrogen astatide |
| ImageNameL1 = Ball-and-stick model of hydrogen astatide |
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|Section1={{Chembox Identifiers |
|Section1={{Chembox Identifiers |
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| CASNo = 13464-71-6 |
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| CASNo_Ref = {{Cascite|correct|CAS}} |
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| PubChem = 23996 |
| PubChem = 23996 |
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| ChemSpiderID = 22432 |
| ChemSpiderID = 22432 |
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|Section2={{Chembox Properties |
|Section2={{Chembox Properties |
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| Formula = HAt |
| Formula = HAt |
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| H=1|At=1 |
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| ConjugateAcid = [[Astatonium]] |
| ConjugateAcid = [[Astatonium]] |
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| ConjugateBase = [[Astatide]] |
| ConjugateBase = [[Astatide]] |
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|BoilingPtC=-3 |
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|BoilingPt_notes=estimated<ref name=":)">[https://openlibrary.org/books/OL5444627M/Analytical_chemistry_of_technetium_promethium_astatine_and_francium ''Analytical Chemistry of Technetium, Promethium, Astatine and Francium''] by Avgusta Konstantinovna. Lavrukhina, Aleksandr Aleksandrovich Pozdnyakov {{ISBN|0250399237}}</ref> |
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| Solubility = Soluble |
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|Section3={{Chembox Related |
|Section3={{Chembox Related |
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'''Hydrogen astatide''', also known as '''astatine hydride''', '''astatane''', or ''' |
'''Hydrogen astatide''', also known as '''astatine hydride''', '''astatane''', '''astatidohydrogen''' or '''hydroastatic acid''', is a chemical compound with the [[chemical formula]] HAt, consisting of an [[astatine]] [[atom]] [[Covalent bond|covalently]] bonded to a [[hydrogen]] atom.<ref>PubChem, [https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=23996 "astatane - Compound Summary"], accessed July 3, 2009.</ref> It thus is a [[hydrogen halide]]. |
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This [[chemical compound]] can dissolve in water to form hydroastatic acid, which exhibits properties very similar to the other |
This [[chemical compound]] can dissolve in water to form hydroastatic acid, which exhibits properties very similar to the other five [[binary acid]]s, and is in fact the strongest among them. However, it is limited in use due to its ready decomposition into elemental hydrogen and astatine,<ref>Fairbrother, Peter, [http://sci.tech-archive.net/Archive/sci.chem/2008-09/msg00105.html "Re: Is hydroastatic acid possible?"] {{Webarchive|url=https://web.archive.org/web/20110202174012/http://sci.tech-archive.net/Archive/sci.chem/2008-09/msg00105.html |date=2011-02-02 }}, accessed July 3, 2009.</ref> as well as the short half-life of the various [[isotopes of astatine]]. Because the atoms have a nearly equal [[electronegativity]], and as the {{chem2|At+}} ion has been observed,<ref>[https://books.google.com/books?id=UPBKxgY20lEC&pg=PA219 Advances in Inorganic Chemistry, Volume 6] by Emeleus, p.219, Academic Press, 1964 {{ISBN|0-12-023606-0}}</ref> dissociation could easily result in the ''hydrogen'' carrying the negative charge. Thus, a hydrogen astatide sample can undergo the following reaction: |
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:2 HAt → H |
:{{chem2|2 HAt → H+ + At− + H− + At+ → H2 + At2}} |
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This results in elemental hydrogen [[gas]] and astatine [[precipitate]]. |
This results in elemental hydrogen [[gas]] and astatine [[precipitate]]. Furthermore, a trend for hydrogen halides, or HX, is that [[Standard enthalpy of formation|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. |
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Additionally, astatine has no stable [[isotope]]s. The most stable is astatine-210, which has a [[half-life]] of approximately 8.1 hours, making its [[chemical compound]]s especially difficult to work with,<ref>Gagnon, Steve, [http://education.jlab.org/itselemental/ele085.html "It's Elemental"], accessed July 3, 2009.</ref> as the astatine will quickly [[Radioactive decay|decay]] into other elements. |
Additionally, astatine has no stable [[isotope]]s. The most stable is astatine-210, which has a [[half-life]] of approximately 8.1 hours, making its [[chemical compound]]s especially difficult to work with,<ref>Gagnon, Steve, [http://education.jlab.org/itselemental/ele085.html "It's Elemental"], accessed July 3, 2009.</ref> as the astatine will quickly [[Radioactive decay|decay]] into other elements. |
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==Preparation== |
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Hydrogen astatide can be produced by reacting astatine with hydrocarbons (such as [[ethane]]):<ref>{{cite book | last=Hagen | first=A. P. | title=The formation of bonds to halogens | publisher=VCH Publishers | publication-place=New York | year=1989 | isbn=978-0-470-14538-8 | oclc=472256324}}</ref> |
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:{{chem2|C2H6 + At2 → C2H5At + HAt}} |
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This reaction also produces the corresponding alkyl astatide, in this case ethyl astatide (astatoethane). |
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==References== |
==References== |
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{{reflist}} |
{{reflist}} |
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{{astatine compounds}} |
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{{Hydrogen compounds}} |
{{Hydrogen compounds}} |
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{{Hydrides by group}} |
{{Hydrides by group}} |
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[[Category:Hydrogen compounds]] |
[[Category:Hydrogen compounds]] |
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[[Category:Astatine compounds]] |
[[Category:Astatine compounds]] |
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[[Category:Nonmetal halides]] |
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[[Category:Diatomic molecules]] |
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[[Category:Hydrides]] |
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[[Category:Mineral acids]] |
Latest revision as of 15:07, 16 August 2024
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Names | |||
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IUPAC name
Hydrogen astatide[1]
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Systematic IUPAC name
Astatane[2] | |||
Identifiers | |||
3D model (JSmol)
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ChEBI | |||
ChemSpider | |||
532398 | |||
PubChem CID
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CompTox Dashboard (EPA)
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Properties | |||
HAt | |||
Molar mass | 211 g·mol−1 | ||
Boiling point | −3 °C (27 °F; 270 K) estimated[3] | ||
Soluble | |||
Conjugate acid | Astatonium | ||
Conjugate base | Astatide | ||
Related compounds | |||
Other anions
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Hydrogen bromide | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Hydrogen astatide, also known as astatine hydride, astatane, astatidohydrogen or hydroastatic acid, is a chemical compound with the chemical formula HAt, consisting of an astatine atom covalently bonded to a hydrogen atom.[4] It thus is a hydrogen halide.
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,[5] 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,[6] 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. Furthermore, 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,[7] as the astatine will quickly decay into other elements.
Preparation
[edit]Hydrogen astatide can be produced by reacting astatine with hydrocarbons (such as ethane):[8]
- C2H6 + At2 → C2H5At + HAt
This reaction also produces the corresponding alkyl astatide, in this case ethyl astatide (astatoethane).
References
[edit]- ^ "Hydrogen astatide (CHEBI:30418)".
- ^ 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?" Archived 2011-02-02 at the Wayback Machine, 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.