Oxalatonickelate

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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. Since oxalate functions as a bidentate ligand it can satisfy two coordinate positions around the nickel atom, or it can bridge two nickel atoms together.

The shape around the nickel atom is octahedral for diaquabis(oxalato)nickelate. The colour of this is green due to the Ni(–O–)6 chromophore. The absorption in infrared is at 8,300 9,060 13,400, 15,260, and 26,160  cm−1. [1] The ligand field parameters are 10 Dq=8800 cm−1 and B=1000 cm−1. [1]

formulanameother namesstructurecolour or decompositionCAS Numberreferences
[(C2O4)2Ni]2−bis(oxalato)nickelate (2−) [2]
Li2[(C2O4)2Ni]•6H2Odilithium bis(oxalato)nickelate (2−)dehydrate 80° decompose 345°112678-94-1 [3]
Na2[(C2O4)2Ni]•3H2Odisodium bis(oxalato)nickelate (2−)dehydrates at 85°, decompose over 320°107996-66-5 [4] [5]
[NH4]2[(C2O4)2Ni]•3H2Odiammonium bis(oxalato)nickelate (2−)dehydrate 180-262° deaminate 262-338 °C108559-31-5 [4] [6]
K2[(C2O4)2Ni•2H2O]•4H2Odipotassium 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 / 2.04green14244-63-4 [7] [8] [9] [10]
Co[(C2O4)2Ni]•5H2Ocobalt(II)bis(oxalato)nickelate(II)pentahydratelight pink [11]
Mn[(C2O4)2Ni]•4H2Omanganese(II)bis(oxalato)nickelate(II)tetrahydratelight blue [12]
Cd[(C2O4)2Ni]•4H2Ocadmium(II)bis(oxalato)nickelate(II)tetrahydrateblue [11]

Because the Ni2+ 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. [13]

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<span class="mw-page-title-main">Potassium ferrioxalate</span> Chemical compound

Potassium ferrioxalate, also called potassium trisoxalatoferrate or potassium tris(oxalato)ferrate(III) is a chemical compound with the formula K
3[Fe(C
2O
4)
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Magnesium oxalate is an organic compound comprising a magnesium cation with a 2+ charge bonded to an oxalate anion. It has the chemical formula MgC2O4. Magnesium oxalate is a white solid that comes in two forms: an anhydrous form and a dihydrate form where two water molecules are complexed with the structure. Both forms are practically insoluble in water and are insoluble in organic solutions.

Chromium(II) oxalate is an inorganic compound with the chemical formula CrC2O4.

<span class="mw-page-title-main">Bismuth(III) nitrate</span> Chemical compound

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2O
4. The compound creates light pink crystals, does not dissolve in water, and forms crystalline hydrates. It occurs naturally as the mineral Lindbergite.

Samarium(III) oxalate is an inorganic compound, a salt of samarium and oxalic acid with the formula Sm2(C2O4)3. The compound does not dissolve in water, forms a crystalline hydrate with yellow crystals.

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References

  1. 1 2 Morrison, J.T.; Baker, W.A. (January 1969). "Nickel(II) complexes with oxygen and sulfur donors". Inorganica Chimica Acta. 3: 463–467. doi:10.1016/S0020-1693(00)92534-9.
  2. ↑ Macintyre, Jane E. (1997). Dictionary of Inorganic Compounds, Supplement 4. CRC Press. p. 453. ISBN   9780412750205 . Retrieved 21 April 2016.
  3. ↑ Saha, H.L.; Mitra, S. (June 1987). "Thermal decomposition reactions of metal carboxylato complexes in the solid state. III. Thermographic and differential thermal studies of metal oxalato, malonato and succinato complexes". Thermochimica Acta. 116: 53–64. doi:10.1016/0040-6031(87)88164-9.
  4. 1 2 Macintyre, Jane E. (1997). Dictionary of Inorganic Compounds, Supplement 4. CRC Press. p. 251. ISBN   9780412750205 . Retrieved 21 April 2016.
  5. ↑ Saha, H.L.; Mitra, S. (January 1987). "Thermal decomposition reactions of metal carboxylato complexes in the solid state. I. Thermographic and differential thermal studies of metal oxalato, malonato and succinato complexes". Thermochimica Acta. 109 (2): 331–342. doi:10.1016/0040-6031(87)80029-1.
  6. ↑ Saha, H.L.; Mitra, S. (March 1987). "Thermal decomposition reactions of metal carboxylato complexes in the solid state. II. Thermographic and differential thermal studies of metal oxalato, malonato and succinato complexes". Thermochimica Acta. 112 (2): 275–287. doi:10.1016/0040-6031(87)88284-9.
  7. ↑ Román, P.; Guzmán-Miralles, C.; Luque, A. (15 July 1993). "Structure of dipotassium trans-diaquabis(oxalato-O,O')nickelate(II)–water (1/4)" (PDF). Acta Crystallographica Section C. 49 (7): 1336–1339. doi:10.1107/S0108270193000940.
  8. ↑ Narsimhulu, M.; Raju, B.; Saritha, A.; Narayana Rao, D.; Hussain, K.A. (September 2015). "A new room-temperature ultraviolet emission material: ". Physica B: Condensed Matter. 472: 45–48. Bibcode:2015PhyB..472...45N. doi:10.1016/j.physb.2015.05.019.
  9. ↑ Macintyre, Jane E. (1993-07-15). Dictionary of Inorganic Compounds, Supplement 1. CRC Press. p. 45. ISBN   9780412490903 . Retrieved 25 April 2016.
  10. ↑ Macintyre, Jane E. (1997). Dictionary of Inorganic Compounds, Supplement 4. CRC Press. p. 222. ISBN   9780412750205 . Retrieved 21 April 2016.
  11. 1 2 Deb, Nidhuban; Baruah, S. D.; Dass, N. N. (2000). "Synthesis, Characterization and Thermal Decomposition of ( and )". Journal of Thermal Analysis and Calorimetry. 59 (3): 791–797. doi:10.1023/A:1010153720786. S2CID   94453246.
  12. ↑ Deb, Nidhuban (July 2005). "Thermal decomposition of manganese(II)bis(oxalato)nickelate(II)tetrahydrate". Journal of Thermal Analysis and Calorimetry. 81 (1): 61–65. doi:10.1007/s10973-005-0746-y. S2CID   94799986.
  13. ↑ Packter, A.; Omomo, A. (1984). "The coprecipitation of Magnesium Nickel Oxalate Dihydrate Powders (solid solutions) from aqueous solution: Precipitate compositions and Coprecipitate Mechanisms". Crystal Research and Technology. 19 (4): 467–476. doi:10.1002/crat.2170190406.
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