Nickel(II) perchlorate


Nickel perchlorate is a collection of inorganic compounds with the chemical formula of. Its colors of these solids vary with the degree of hydration. For example, the hydrate forms cyan crystals, the pentahydrate forms green crystals, but the hexahydrate forms blue crystals. Nickel perchlorate hexahydrate is highly soluble in water and soluble in some polar organic solvents.

Preparation

Aqueous solutions of nickel perchlorate can be obtained by treating nickel(II) hydroxide, nickel(II) chloride or nickel(II) carbonate with perchloric acid.
Two hydrates have been characterized by X-ray crystallography: the hexahydrate and the octahydrate. Several other hydrates are mentioned including the pentahydrate, which is claimed to crystallize at room temperature, the nonahydrate, which is claimed to crystallize at −21.3 °C, a tetrahydrate, and a monohydrate.
The yellow anhydrous product is obtained by treating nickel chloride with chlorine trioxide. As deduced by X-ray crystallography, Ni resides in a distorted octahedral environment and the perchlorate ligands bridge between the Ni centers.

Applications

Nickel perchlorates has few practical uses.

Other compounds

  • Ni2 also forms some compounds with NH3, such as Ni2·6NH3 which is a light purple crystal.
  • Ni2 also forms some compounds with N2H4, including Ni2·2N2H4 as a light positive solid or Ni2·5N2H4 which are purple crystals.
  • Ni2 forms compounds with CO(NH2)2, like Ni2·6CO2 which is a yellow-green solid.
  • Ni2 forms compounds with CON3H5, for example Ni2·3CON3H5 which is a blue solid.
  • Ni2 forms compounds with CON4H6, such as Ni2·3CON4H6 which is an explosive blue crystal with a bulk density of 0.95 g/cm3.
  • Ni2 can also form compounds with CS(NH2)2, such as Ni2·6CS2 which is a pale green solid.
  • Ni2 also forms some compounds with CSN3H5, such as Ni2·2CSN3H5·3H2O which is a blue paramagnetic crystal or Ni2·3CSN3H5·2H2O which is a dark positive crystal.
  • Ni2 also forms some compounds with pyridine.F. Madaule-Aubry, W. R. Busing, G. M. Brown: Crystal structures of complexes of nickel perchlorate with substituted pyridines. II. Tetrakis-nickel perchlorate. In: Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry. 24, S. 754,.