Effect of second sphere cations on formation of nickel (2) chloride complexes in molten salts

The effect of the outer-sphere cations of alkali metals (A-Li+, Na+, K++ Rb++ or Cs+) on complexing of Ni(2) in melts of ANO3 and ACl has been studied. The effect of these cations on the equilibrium octahedral-tetrahedral nickel (2) complexes in melts of ANO3 and ACl has been elucidated. It has been established that octahedral complex [NiCL6]4- is formed with an outer-sphere cation Li+, tetrahedral complex [NiCl4]2 with Rb+ and Cs+, and equilibrium [NiCl6]4-reversible[NiCl4]2- is observed in the case of Na+ and K+. The regularities in a change of spectroscopic parameters of the complex depending on an outer-sphere cation have been investigated