Can nickel(IV) be stabilised in water using appropriate ligands?

Question

Platinum(IV) is perfectly stable in water as its hexachlorido complex, and so is palladium(IV). However, nickel(IV) is not stable in water even in its hexafluorido complex- the exchange-inertness of hexafluoridonickelate(IV) (which is low-spin despite the strong pi-donor property of fluoride; nickel(IV) is "just too high in oxidation state" to admit a high-spin configuration) does not reduce the strong oxidising ability of the central nickel(IV).

My initial guess was that hexaamminenickel(IV) and/or hexacyanidonickelate(IV) would be stable in water, since the otherwise hydrolytically unstable cobalt(III) can be stabilised that way, but I could not find any information about the hydrolytic stability of either ion. So I'm asking it here, just in case stronger sigma-donors than ammonia/cyanide are necessary.

Answer 1

Nickel may be oxidized from nickel(II) to nickel(IV) with diacetylpyridine dioxime ligands[1] and also in polyniobate complexes[2], in the latter case using hypobromite as the oxidizing agent. The latter reference also notes a Ni(IV) molybdate complex.

References

1. Everett I. Baucom and Russell S. Drago. "Nickel(II) and nickel(IV) complexes of 2,6-diacetylpyridine dioxime". J. Am. Chem. Soc. 1971, 93, 24, 6469–6475. https://doi.org/10.1021/ja00753a022

2. Charles M. Flynn Jr. and Galen D. Stucky."Heteropolyniobate complexes of manganese(IV) and nickel(IV)". Inorg. Chem. 1969, 8, 2, 332–334. https://doi.org/10.1021/ic50072a029