Nickel compositions for preparing nickel metal and nickel complexes

摘要

Nickel(II) compositions for use in manufacturing nickel metal (Ni(0)) compositions, and specifically to methods of making basic nickel carbonates used to produce nickel metal compositions are disclosed. By varying the molar ratios of carbonates and bicarbonates to nickel salts, the methods provide basic nickel carbonates that produce superior nickel metal-containing solids that are well-suited to forming nickel-ligand complexes with phosphorus-containing ligands. The phosphorus-containing ligands can be monodentate or bidentate phosphorus-containing ligands.

主权项

1. A method of making a nickel complex of a phosphorus-containing ligand comprising:
reacting a nickel metal with a phosphorus-containing ligand, wherein the nickel metal is provided by reducing a nickel(II) composition formed according to a process comprising the steps of (i) contacting, while agitating, a nickel(II) salt dissolved in water with a precipitant selected from the group consisting of bicarbonate salt, carbonate salt, and a combination thereof, to form a reaction mixture comprising an water phase and a precipitate comprising the nickel(II) composition; and (ii) controlling the contacting rate so that the water phase has a pH between about 4.0 and about 7.5.