“…Another Ni(II) hydroxide, designated as Ni(OH)2, has been proposed ( 56), but actually it seems to be a not well crystallized form of ~ Ni(OH)2 with a random number of water molecules in its lattice (57,58). ers (59)(60)(61)(62)(63)(64)(65), two Ni(III) oxyhydroxides, ~ and "t NiOOH, being those most accepted. Nevertheless the structure, and even the oxidation state, of these oxyhydroxides have been recently questioned (66)(67)(68).…”