Wikipedia
The oxalatonickelates are a class of compounds that contain nickel complexed by oxalate groups. They form a series of double salts, and include clusters with multiple nickel atoms.
formula
name
other names
structure
Remarks
references |-|[(CO)Ni]
bis(oxalato)nickelate (2−)
Li[(CO)Ni]•6HO
dilithium bis(oxalato)nickelate (2−)
cas=112678-94-1 dehydrate 80° decompose 345°
Na[(CO)Ni]•3HO
disodium bis(oxalato)nickelate (2−)
cas=107996-66-5 dehydrates at 85°, decompose over 320°
[NH][(CO)Ni]•3HO
diammonium bis(oxalato)nickelate (2−)
cas=108559-31-5 dehydrate 180-262° deaminate 262-338 °C
K[(CO)Ni•2HO]•4HO
dipotassium trans-diaquabis(oxalato-O,O')nickelate(II)-water (1/4)
potassium bis oxalate nickel(II) tetrahydrate
monoclinic a=8.647 b=6.627 c=12.118 β=101.58° V=680.3 Z=2 density=2.05 / 2.04
green cas=14244-63-4
Co[(CO)Ni]•5HO
cobalt(II)bis(oxalato)nickelate(II)pentahydrate
light pink
Mn[(CO)Ni]•4HO
manganese(II)bis(oxalato)nickelate(II)tetrahydrate
light blue
Cd[(CO)Ni]•4HO
cadmium(II)bis(oxalato)nickelate(II)tetrahydrate
blue
Because the Ni ion resembles many other divalent metal ions, it can be substituted by them, or substitute for them in other oxalate compounds to form mixed oxalates where the proportions can vary continuously. For example, magnesium nickel oxalate dihydrate.