Nickel organic acid salts

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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 (CH3COO)2Ni·4H2O. It has monodentate acetate and hydrogen bonding. A dihydrate also exists. Nickel acetate is used to seal anodised aluminium.[1]

Nickel formate Template:Chem2 decomposes when heated to yield carbon dioxide, carbon monoxide, hydrogen, water and finely divided porous nickel.[2] All the nickel atoms are six coordinated, but half have four water molecules and two formate oxygens close to the atom, and the other half are coordinated by six oxygens of formate groups.[3]

Aspergillus niger is able to dispose of otherwise toxic levels of nickel in its environment by forming nickel oxalate dihydrate crystals.[4] nickel oxalate can also be formed in to various nanorods and nanofibres by use of surfacants.[5] When heated nickel oxalate dihydrate dehydrates at 258° and decomposes to Ni metal[6] over 316 °C.[7] Double oxalate salts where oxalate is a ligand on the nickel atom may be called oxalatonickelates.

Other organic acid salts of nickel include nickel oleate, nickel propionate, nickel butyrate, nickel caprylate, nickel lactate, nickel benzoate, nickel bis(acetyl acetonate), nickel salicylate, nickel alkyl phenyl salicylate. Nickel stearate forms a green solution, however when precipitated with alcohol a gel is produced, that also contains a mixture of basic salts, and free stearic acid.[8]

Nickel malonate, and nickel hydrogen malonate both crystallise with two molecules of water. They decomposes when heated to yield gaseous water, carbon dioxide, carbon monoxide, ethanol, acetic acid, methyl formate and ethyl formate. Nickel acetate exists as an intermediate and the final result is that solid nickel, nickel oxide, Ni3C and carbon remain.[9] With malonate nickel can form a bis-malonato-nickelate anion, which can form double salts.[10] Nickel maleate can be made from maleic acid and nickel carbonate in boiling water. A dihydrate crystallises from the water solution.[11] Nickel fumarate prepared from fumaric acid and nickel carbonate is pale green as a tetrahydrate, and mustard coloured as an anhydride. It decomposes when heated to 300° to 340° in vacuum. Decomposition mostly produces nickel carbide, carbon dioxide, carbon monoxide and methane. But also produced were butanes, benzene, toluene, and organic acid.[12]

Nickel succinate can form metal organic framework compounds.[13]

Nickel citrate complexes are found in leaves of some nickel accumulating plant species in New Caledonia such as Pycnandra acuminata.[14] Citrate complexes include NiHcit, NiHcit23−, Nicit−, Nicit24−, and Ni2H2cit24−. (ordered from low to high pH). Also there is Ni4H4cit35−. Nickel citrate is important in nickel plating.[15] When precipitation of nickel citrate is attempted a gel forms. This apparently consists of tangled fibres of [(C6H6O7)Ni]n, which can be reduced to nickel metal fibres less than a micron thick, and meters long.[16] Double nickel citrates exist, including tetraanion citrate when pH is over 9.5.[17] An amorphous nickel iron citrate Ni3Fe6O4(C6H6O7)8·6H2O produces carbon monoxide, carbon dioxide and acetone when heated over 200 °C leaving Trevorite, NiFe2O4 a nickel ferrite.[18] A green crystalline nickel citrate with formula Ni3(C6H5O7)2·10H2O melts at 529K and decomposition starts at 333K.[19]

Nickel glutarate in the form called Mil-77, [Ni20{(C5H6O4)20(H2O)8}]⋅40H2O is pale green. It crystallises in a porous structure containing twenty member rings. The 40 water molecules "occluded" in the porous channels come out when it is heated to 150 °C retaining the crystal framework. At 240 °C the crystal form changes and over 255° the remaining water is lost. Between 330° and 360° the organic components burn and it is destroyed.[20]

Cyclopropane carboxylic acid forms two basic salts with nickel, a hydrate Template:Chem2 with density 1.554 Mg/m3 and an anhydrous form Ni5(OH)2(C4H5O2)8 with density 2.172 mg/m3.[21]

Nickel trifluoroacetate tetrahydrate exists, as well as two emerald green acid trifluoroacetates, a bridged trinuclear form [Ni3(CF3COO)6(CF3COOH)6](CF3COOH) and a hydrated acid form [Ni3(CF3COO)6(CF3COOH)2(H2O)4](CF3COOH)2 both with triclinic crystal form. The first has density 2.205 and the second 2.124. They are made by dissolving the nickel trifluoroacetate tetrahydrate in trifluoroacetic acid either anhydrous or 1% hydrated.[22]

Nickel naphthenate is used as a fuel additive to suppress smoke,[23] as a rubber catalyst and as an oil additive.

When Nickel benzoate is heated in a vacuum, carbon dioxide, carbon monoxide, benzene, benzoic acid, phenol, biphenyl, nickel, nickel oxide, and nickel carbide are formed.[24] It can crystallise as anhydrous, a trihydrate or a tetrahydrate.[25]

Nickel terephthalate can be made by a double decomposition of sodium terephthalate and nickel nitrate. Nickel terephthalate precipitates. Its solubility is 0.38 g/100g water at 25 °C. In ammonium hydroxide a violet solution forms. Boiling acetic acid converts the nickel to nickel acetate. The terephthalate converts to a basic salt when boiled in water. Understating this compound is important when reducing coloured contaminants in polymers made from terephthalate.[26]

Listing

formula name mol struct cell Å ° V Z density colour refs
wt a b c β Å3 g/cm3
Template:Chem2 Nickel formate hydrate monoclinic 8.60 7.06 9.21 96°50′ 4 [3]
[Ni20{(C5H6O4)20(H2O)8}]Template:Hydrate Nickel glutarate cubic 16.581 4559 pale green [20]
Template:Chem2 nickel cyclopropane carboxylate hydrate orthorhombic 14.810 24.246 24.607 8836 4 1.554 bright green [21]
Ni5(OH)2(C4H5O2)8 nickel cyclopropane carboxylate orthorhombic 19.406 18.466 21.579 90 7733 8 2.172 pale green [21]
[Ni3(CF3COO)6(CF3COOH)6](CF3COOH) Nickel acid trifluoroacetate trigonal 13.307 53.13 8148 6 2.205 emerald green [22]
[Ni3(CF3COO)6(CF3COOH)2(H2O)4](CF3COOH)2 Nickel acid trifluoroacetate hydrate triclinic 9.12 10.379 12.109 α=84.59° β=72.20° γ=82.80° 1080.9 1 2.124 emerald green [22]
K2[Ni(C6H5O7)(H2O)2]2·4H2O potassium nickel citrate triclinic 6.729 9.100 10.594 α=94.86 β=100.76 γ=103.70 613.5 1 1.942 green [27]
K2[Ni2(C6H5O7)2(H2O)4]·4H2O Dipotassium tetraaquabis(μ-citrato-k4O:O',O'',O''')nickelate(II) tetrahydrate 717.94 monoclinic 10.616 13.006 9.0513 93.09 1247.8 2 1.911 green [28]
N(CH3)4[Ni4(C6H4O7)3(OH)(H2O)]·18H2O tetramethyl ammonium nickel basic citrate triclinic 11.84 14.29 20.93 96.16 β=106.36 γ=94.89 3352 1 bright green extremely weak [27][29]
Na2[Ni(C6H4O7)]Template:Hydrate disodium nickel citrate green dec 371 [17]
(NH4)2[Ni(HCit)Template:Hydrate]2Template:Hydrate Dimeric ammonium diaquocitratonickelate (II) dihydrate 639.79 triclinic 6.407 9.471 9.6904 α=105.064 β=91.99 γ=89.33 567.5 1 1.872 green [30]
(NH4)4[Ni(HCit)2]Template:Hydrate tetrammonium dicitratonickelate (11) dihydrate 545.10 monoclinic 9.361 13.496 9.424 115.476 1074.9 2 1.684 [30]
Na2[Ni(HCit)Template:Hydrate]2Template:Hydrate Dimeric sodium diaquocitratonickelate (II) dihydrate [30]
K2[Ni(HCit)Template:Hydrate]2Template:Hydrate Dimeric potassium diaquocitratonickelate (II) dihydrate [30]
(NH4)2[Ni(H2O)6][Ti(H2cit)3]2·6H2O 1547.43 hexagonal 15.562 7.690 1605.5 1 1.600 light green [31]
[Ni(C5H7O2)2]3 Nickel(II) acetylacetonate 256.91 orthorhombic 23.23 9.64 15.65 3505 4 1.46 dark green [32]
Ni[C4O4]Template:Hydrate nickel squarate ?cubic 8.068 8.068 8.068 90° 525 1.93 green [33]
Ni[C4O4]Template:Hydrate nickel squarate octahydrate 428.93 monoclinic 10.288 6.372 12.852 106.98 805.8 2 1.768 green [34]
Ni[C5O5]Template:Hydrate Nickel croconate trihydrate orthorhombic green [35]
K2[Ni(C5O5)2(H2O)2]Template:Hydrate Poly[[di-μ2-aqua-di-μ5-croconato(2-)-nickel(II)dipotassium(I)] tetrahydrate] 525.11 monoclinic 8.015 6.660 16.489 90.20 880.1 2 1.982 green [36]
Ni(C5H5COO)2Template:Hydrate nickel dibenzoate tetrahydrate 354.98 monoclinic 6.1341 34.180 6.9793 95.331 1457.0 4 1.618 light green [25]
Ni(C5H5COOCOOH)2Template:Hydrate nickel dihydrogen diphthalate hexahydrate monoclinic 16.024 5.574 12.500 113.42 2 1.611 [37]
Ni[C6H4(COO)2]Template:Hydrate Nickel terephthalate green [26]
Ni(OH)[C6H4(COO)(COOH)]Template:Hydrate basic nickel terephthalate green [26]

References

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  27. ↑ 27.0 27.1 Template:Cite journal
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