Sodium and Potassium Nickel IV Paraperiodates

Compounds in which nickel is present in a higher oxidation state than 2+ are uncommon and often relatively unstable. Exceptions are found in sodium and potassium nickel(IY) paraperiodates, which have been described by R y and Sarma1 and which correspond to the formulation Na(K)NiI06-xH20. These compounds are readily prepared by peroxydisulfate oxidation of nickel(II) in the presence of periodate. 

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Nickel powder, synthesis 56 Potassium hexacyanodinickel-ate(I), synthesis 57 Sodium and potassium nickel(IV) paraperiodates, synthesis 58... 

Sodium and potassium nickel (IV) paraperiodates are almost completely insoluble in cold water. They decom-... 

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