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碲酸

碲酸
IUPAC名
Telluric(VI) acid
别名 原碲酸
识别
CAS号 7803-68-1  ☒N
PubChem 62686
ChemSpider 55517
SMILES
 
  • O[Te](O)(O)(O)(O)O
InChI
 
  • 1/H2O4Te/c1-5(2,3)4/h(H2,1,2,3,4)
InChIKey XHGGEBRKUWZHEK-UHFFFAOYAT
ChEBI 30463
性质
化学式 H6O6Te
摩尔质量 229.64 g·mol⁻¹
外观 白色结晶固体
密度 (固) 3.07
熔点 136°C (409.15 K)
溶解性 可溶
结构
分子构型 八面体
偶极矩 0 D
危险性
主要危害 刺激性
相关物质
相关化学品 硒酸
硫酸
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

碲酸化学式为Te(OH)6化合物。它是弱酸,与强碱反应生成碲酸盐[1]

碲酸可由二氧化碲双氧水三氧化铬氧化制备。

TeO2 + 2H2O2 + 2H+ → Te(OH)6

它具有较强的氧化性,但是其氧化反应在动力学上是惰性的,其标准电极电势数据如下:

H6TeO6 + 2H+ + 2e TeO2 + 4H2O2 Eo = +1.02 V

在稀硫酸介质中,可使溴化氢碘化氢氧化成单质和单质,而自身被还原成二氧化碲的混合物;用二氧化硫亚铁离子联氨等可把碲酸还原成

H6TeO6 + 6HI → Te + 3I2 + 6H2O

偏碲酸,H2TeO4,硫酸的同类物,仍属未知。

碲酸和它的盐总是含有六配位的碲。碲酸钡, BaTeO4,由二氧化碲和过氧化钡反应产生,与钼酸钡为同晶型。

碲酸是很弱的六元酸[2],但通常只有2个容易被取代,有时也有多个氢可以被取代,如Ag3H3TeO6、Zn3TeO6。它能形成Te(OMe)6烷氧基化合物。

参考资料

  1. ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
  2. ^ 武汉大学 吉林大学 等. 无机化学(第三版) 下册. 高等教育出版社, 2011. pp 623. ISBN 978-7-04-004880-3

拓展阅读

  • Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999). Advanced Inorganic Chemistry (6th ed.) New York:Wiley-Interscience. ISBN 0-471-19957-5.
  • Lide, D. R. (ed.) (2002). CRC Handbook of Chemistry and Physics, 83rd ed., Boca Raton, FL: CRC Press.
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碲酸
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