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Tetraiodonickelate

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Tetraiodonickelate(II) is a complex ion of nickel with four iodide ions arranged in a tetrahedron. is red in solution. This colour is due to absorption around 530 nm and below 450 nm. Maximum light transmission is around 620 nm, which is red. A broad weak absorption in the near infrared is at 740 nm. The magnetic moment is anomalously low.

A mixture of lithium iodide and nickel iodide in water or methanol can partition ions into a cyclohexane-amine mixture. The solution formed is blood red.

History

Already in 1909 Cambi had noticed that a mixture of nickel iodide and sodium iodide dissolved in acetone has a red colour. This red colour was due to the presence of tetraiodonickelate.

Salts

Bis(triphenylmethylarsonium) tetraiodoronickelate 2 is red in colour. It can be made from triphenylmethylarsonium iodide and nickel iodide in hot ethanol. The red flakes that precipitate must be filtered before the alcohol cools, else the compound decomposes.

Bis(tetraethylammonium) tetraiodonickelate 2 has a molecular weight of 826.8135 and a CAS number of 13927-28-1.

1,2,6-Trimethylpyrazinium tetraiodonickelate has CAS 88227-96-7.

References

  1. ^ Gill, Naida S.; Nyholm, R. S. (1959). "802. Complex halides of the transition metals. Part I. Tetrahedral nickel complexes". Journal of the Chemical Society (Resumed): 3997. doi:10.1039/JR9590003997.
  2. Hollebone, B. R. (1971). "Pseudo-halide complexes of transition metals. Part II. Spectra, structure, and nature of bonding". Journal of the Chemical Society A: Inorganic, Physical, Theoretical: 484. doi:10.1039/J19710000481.
  3. Florence, T. M.; Farrar, Yvonne J. (July 1968). "Liquid-liquid extraction of nickel with long-chain amines from aqueous and nonaqueous halide media". Analytical Chemistry. 40 (8): 1200–1206. doi:10.1021/ac60264a010.
  4. Standen, Anthony (1967). Encyclopedia of Chemical Technology. Interscience Publishers. p. 759.
  5. "bis(tetraethylammonium) tetraiodonickelate". webbook.nist.gov. Retrieved 14 June 2016.
Iodine compounds
Iodine(−I)
Iodine(I)
Iodine(II)
Iodine(III)
Iodine(IV)
Iodine(V)
Iodine(VII)
Nickel compounds
Nickel(0)
Nickel(II)
Nickel(III)
Nickel(IV)
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