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1 Complexes  




2 References  













Niobium oxalate






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From Wikipedia, the free encyclopedia
  
(Redirected from Niobium(V) oxalate)
Niobium(V) hydrogen oxalate
Names
Other names

Niobium oxalate
Niobium pentoxalate

Identifiers

CAS Number
  • 21348-59-4 checkY

    • 3D model (JSmol)
    ECHA InfoCard 100.040.295 Edit this at Wikidata

    CompTox Dashboard (EPA)

    • InChI=1S/C2H2O4.Nb/c3-1(4)2(5)6;/h(H,3,4)(H,5,6);

      Key: XTTKJDYDBXPBDJ-UHFFFAOYSA-N

    • [Nb].O=C(O)C(=O)O

    Properties

    Chemical formula

    		 Nb(HC2O4)5
    Molar mass 538.056
    Appearance colourless monoclinic crystals[1]

    Solubility in water

    		 soluble in water
    Solubility soluble in oxalic acid

    Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

    Infobox references

    Niobium(V) oxalate is the hydrogen oxalate salt of niobium(V). The neutral salt has not been prepared.[2]

    Complexes[edit]

    Niobium(V) can form complexes with hydroxy acids, as well as oxalic acid. The salt formed is more complex than tartaric acid for niobium (as opposed to tantalum).[3]NH4[NbO(C2O4)2(H2O)2]·3H2O starts to lose water at 125°C, and at 630°C, it fully decomposes, forming a compound known as niobium pentoxide;[4] Heating this complex and sodium citrate at 650°C can form sodium niobate (NaNbO3).[5]

    Rb3[NbO(C2O4)3]·2H2O is a colourless crystal, which includes the [NbO(C2O4)3]3- anion.[6]Sr3[NbO(C2O4)3]2·8H2O is a compound containing the same anion, forming the anhydrous at 200°C, starting to decompose at 260°C, and at 875°C it decomposes to SrCO3 and SrNb2O6.[7]

    References[edit]

    1. ^ John A Dean. Lange's Handbook of Chemistry, 11th ed. McGraw-Hill Book Company, 1973. pp 4-87
  • ^ A Textbook of Inorganic Chemistry. Vol VI, Part III. Vanadium, Niobium and Tantalum. Charles Griffin & Company Ltd, 1929. pp 166. Oxalo-niobic Acid.
  • ^ Shen, Panwen; et al. Series of Inorganic Chemistry. Vol 8. Titanium group, vanadium group, chromium group. Science Press, 2011. pp 279-280.
  • ^ Xu, Xiaoshu; Su, Tingting; Jiang, Heng. Study on thermal decomposition process of niobium oxalate. Fenxi Yiqi, 2009. (5): 75-77.
  • ^ Bian, Yu-bo; Jiang, Heng; Su, Ting-ting; Gong, Hong. 柠檬酸钠与草酸铌合成NaNbO3粉体的反应机理 (lit. Study on the synthesis mechanism of NaNbO3 powder from sodium citrate and niobium oxalate). Huaxue Gongchengshi (Chemical Engineer), 2011 (3): 56-58
  • ^ Šestan, M., Perić, B., Giester, G. et al. Another Structure Type of Oxotris(oxalato)niobate(V): Molecular and Crystal Structure of Rb3[NbO(C2O4)3]⋅2H2O. Struct Chem (2005) 16: 409. doi:10.1007/s11224-005-3111-7
  • ^ Marta, L., Zaharescu, M. & Macarovici, C.G. Thermal and structural investigation of some oxalato-niobium complexes. Journal of Thermal Analysis (1983) 26: 87. doi:10.1007/BF01914092

    • Retrieved from "https://en.wikipedia.org/w/index.php?title=Niobium_oxalate&oldid=1096104053"
    Categories: 
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     ●Oxalates
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