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Nickel ions can act as a cation in salts with many acids, including common oxoacids. Salts of the hexaaqua ion (Ni · 6 H 2 O 2+) are especially well known. Many double salts containing nickel with another cation are known. There are organic acid salts. Nickel can be part of a negatively charged ion (anion) making what is called a nickellate.
The nickel organic acid salts are organic acid salts of nickel. In many of these the ionised organic acid acts as a ligand. Nickel acetate has the formula (CH 3 COO) 2 Ni·4H 2 O. It has monodentate acetate and hydrogen bonding. A dihydrate also exists. Nickel acetate is used to seal anodised aluminium. [1]
Double fluorides include the above-mentioned fluoroanion salts, and those fluoronickelates such as NiF 4 and NiF 6.Other odd ones include an apple green coloured KNiF 3 ·H 2 O and NaNiF 3 ·H 2 O, aluminium nickel pentafluoride AlNiF 5 ·7H 2 O, ceric nickelous decafluoride Ce 2 NiF 10 ·7H 2 O, niobium nickel fluoride Ni 3 H 4 Nb 2 F 20 ·19H 2 O, vanadium nickel pentafluoride VNiF 5 ·7H 2 ...
Nickel sulfamate can be used for nickel or mixed nickel-tungsten plating. [8] It can be formed by the action of sulfamic acid on nickel carbonate. [9] Nickel selenite NiSeO 3 has many different hydrates, anhydrous NiSeO 3 · 1 ⁄ 3 H 2 O, NiSeO 3 · H 2 O, NiSeO 3 · 2 H 2 O (which is also a mineral called ahlfeldite), and NiSeO 3 · 4 H 2 O. [10]
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A nickelate is an anion containing nickel or a salt containing a nickelate anion, or a double compound containing nickel bound to oxygen and other elements. Nickel can be in different or even mixed oxidation states, ranging from +1, +2, +3 to +4. The anions can contain a single nickel ion, or multiple to form a cluster ion.
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