MAGNETO-CHEMICAL STUDIES IN VALENCY. PART IV. TETRAPOSITIVE NICKEL AS ALKALI NICKEL PERIODATES

Preparation and properties of sodium and potassium nickel periodates, containing tetrapositive nickel, have been described. The compounds are represented by the formula, Na(K)NilO6, \(x\)H2O, apparently a mixed or double salt of ortho-periodic acid of which the hydrogen atoms are replaced by one alkali metal and one quadrivalent nickel atom. The determination of magnetic susceptibility, giving a very low moment value (µ\(B\) =1.1, indicates, however, that the compounds belong to the class of penetration complexes having octahedral configuration of oxygen atoms around nickel with \(d^2{sp^3}\) hybrid bonds It is, therefore, assumed that [Ni(IO6)] is present as a univalent complex anion in their molecule. The diamagnetic character of alkali silver and alkali copper periodates containing tripositive silver and copper, as observed by Malatesta, has also been accounted for in a similar manner