neptunium(IV) oxalate
{{Chembox
|ImageFile = Neptunium(IV)_oxalate.jpg
|Section1={{Chembox Identifiers
|CASNo = 20196-48-9
|CASNo_Ref = {{cascite|correct|CAS}}
|UNII_Ref = {{fdacite|changed|FDA}}
|PubChem =
|StdInChI=1S/2C2H2O4.Np/c2*3-1(4)2(5)6;/h2*(H,3,4)(H,5,6);/q;;+4/p-4
|StdInChIKey = KBWUHCITSWHCDN-UHFFFAOYSA-J
|SMILES = C(=O)(C(=O)[O-])[O-].C(=O)(C(=O)[O-])[O-].[Np+4]
}}
|Section2={{Chembox Properties
|Formula = Np(C{{sub|2}}O{{sub|4}}){{sub|2}}
|MolarMass = 413.04
|Appearance = Green crystals
|Solubility = slightly soluble}}
|Section3={{Chembox Hazards
|GHSSignalWord = Danger
}}
|Section4={{Chembox Related
|OtherCompounds = Thorium oxalate
}}
}}
Neptunium (IV) oxalate{{cite book |last1=Alburger |first1=D. E. |last2=Perlman |first2=I. |last3=Rasmussen |first3=J. O. |last4=Hyde |first4=Earl K. |last5=Seaborg |first5=Glenn T. |last6=Bishop |first6=George R. |last7=Wilson |first7=Richard |last8=Devons |first8=S. |last9=Goldfarb |first9=L. J. B. |last10=Blin-Stoyle |first10=R. J. |last11=Grace |first11=M. A. |title=Kernreaktionen III / Nuclear Reactions III |date=6 December 2012 |publisher=Springer Science & Business Media |isbn=978-3-642-45878-1 |page=234 |url=https://books.google.com/books?id=FqT1CAAAQBAJ&dq=Neptunium(IV)+oxalate&pg=PA234 |access-date=6 August 2021 |language=en}} is an inorganic compound, a salt of neptunium and oxalic acid with the chemical formula Np(C{{sub|2}}O{{sub|4}}){{sub|2}}.{{cite book |last1=Лидин |first1=Ростислав |last2=Молочко |first2=Вадим |last3=Андреева |first3=Лариса |title=Константы неорганических веществ. Справочник |date=2 February 2019 |publisher=Litres |isbn=978-5-04-077039-7 |page=52 |url=https://books.google.com/books?id=-cQ0DwAAQBAJ&q=%D0%9E%D0%BA%D1%81%D0%B0%D0%BB%D0%B0%D1%82+%D0%BD%D0%B5%D0%BF%D1%82%D1%83%D0%BD%D0%B8%D1%8F%28IV%29&pg=PA52 |access-date=6 August 2021 |language=ru}} The compound is slightly soluble in water, forms crystalline hydrates—green crystals.{{cite book |last1=Luerkens |first1=D. W. |title=Neptunium (IV) oxalate solubility. [22, 45, 60/sup 0/C] |date=1 July 1983 |doi=10.2172/5904308 |url=https://digital.library.unt.edu/ark:/67531/metadc1102341/ |access-date=6 August 2021 |language=English}}{{cite book |title=Encyclopedia of physics |date=1957 |publisher=Springer-Verlag |page=234 |url=https://books.google.com/books?id=x8UrAAAAYAAJ&q=neptunium(IV)+oxalate |access-date=6 August 2021 |language=en}}
Synthesis
Neptunium(IV) oxalate is formed by the oxalic acid precipitation of neptunium (IV) solutions:{{cite journal |last1=Luerkens |first1=D. W. |title=Two-stage precipitation of neptunium (IV) oxalate |date=1983 |url=https://inis.iaea.org/search/search.aspx?orig_q=RN:15001203 |access-date=6 August 2021 |publisher=Du Pont de Nemours (E.I.) and Co. |language=en}}
::{{chem2| NpCl4 + 2H2C2O4 → Np(C2O4)2•6H2O↓ + 4HCl }}
Physical properties
Neptunium(IV) oxalate forms a crystalline hydrate of the composition Np(C2O4)2 • 6H2O with green crystals.
It is insoluble in acetone, and slightly soluble in water.{{cite journal |last1=Luerkens |first1=D. W. |title=Neptunium (IV) oxalate solubility. [22, 45, 60/sup 0/C] |date=1983 |url=https://searchworks.stanford.edu/view/11342714 |access-date=6 August 2021 |publisher=Savannah River Laboratory; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy}}
Chemical properties
Neptunium(IV) oxalate decomposes on heating:{{cite journal |last1=Kozlova |first1=R. D. |last2=Karelin |first2=A. I. |last3=Lobas |first3=O. P. |last4=Matyukha |first4=V. A. |title=Thermal decomposition of neptunium (4) oxalate |journal=Radiokhimiya |date=1984 |volume=26 |issue=3 |pages=311–316 |url=https://inis.iaea.org/search/search.aspx?orig_q=RN:16037484 |access-date=6 August 2021 |language=Russian |issn=0033-8311}}
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Applications
Neptunium(IV) oxalate is used as an intermediate product in the purification of neptunium.{{cite book |last1=Бекман |first1=Игорь |title=Неорганическая химия. Радиоактивные элементы 2-е изд., испр. и доп. Учебник для СПО |date=2 July 2021 |publisher=Litres |isbn=978-5-04-309059-1 |page=272 |url=https://books.google.com/books?id=8EskEAAAQBAJ&dq=%D0%9E%D0%BA%D1%81%D0%B0%D0%BB%D0%B0%D1%82+%D0%BD%D0%B5%D0%BF%D1%82%D1%83%D0%BD%D0%B8%D1%8F(IV)&pg=PA272 |access-date=6 August 2021 |language=ru}}{{cite book |last1=Morss |first1=L. R. |last2=Edelstein |first2=Norman M. |last3=Fuger |first3=Jean |title=The Chemistry of the Actinide and Transactinide Elements (Set Vol.1-6): Volumes 1-6 |date=21 October 2010 |publisher=Springer Science & Business Media |isbn=978-94-007-0211-0 |page=726 |url=https://books.google.com/books?id=9vPuV3A0UGUC&dq=Neptunium(IV)+oxalate&pg=PA726 |access-date=6 August 2021 |language=en}}