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Dichlorobis(ethylenediamine)nickel(II)

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Dichlorobis(ethylenediamine)nickel(II) is the inorganic compound with the formula NiCl2(en)2, where en = ethylenediamine. The formula is deceptive: the compound is the chloride salt of the coordination complex [Ni2Cl2(en)4]2+. This blue solid is soluble in water and some polar organic solvents. It is prepared by ligand redistribution from [Ni(en)3]Cl2 · 2 H2O and hydrated nickel chloride:[1]

Dichlorobis(ethylenediamine­)nickel(II)
Identifiers
3D model (JSmol)
  • InChI=1S/4C2H8N2.4ClH.2Ni/c4*3-1-2-4;;;;;;/h4*1-4H2;4*1H;;/q;;;;;;;;2*+2/p-4
    Key: RHOYQZVYDDJOIB-UHFFFAOYSA-J
  • [Ni+2]1[Cl-][Ni+2][Cl-]1.NCCN.NCCN.NCCN.NCCN.[Cl-].[Cl-]
Properties
C8H32Cl4N8Ni2
Molar mass 499.59 g·mol−1
Density 1.66 g/cm3
Melting point > (decomposes)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
2 [Ni(en)3]Cl2 + NiCl2 → 3 NiCl2(en)2

The rapid ligand redistribution is characteristic of the kinetic lability of octahedral nickel(II) complexes. In contrast with the lability of [Ni(en)3]Cl2+ is the inertness of the isostructural tris(ethylenediamine)cobalt(III) cation.

Structure of the dication [Ni2Cl2(en)4]2+ that comprises the salt "NiCl2(en)2".[2]

References

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  1. ^ State, Harold M. (1960). "Bis(Ethylenediamine)Nickel(II) Chloride". Inorganic Syntheses. 6: 198–199. doi:10.1002/9780470132371.ch63.
  2. ^ Joung, K. O.; O'Connor, C. J.; Sinn, E.; Carlin, R. L. (1979). "Structural and magnetic properties of dimeric di-.mu.-chloro-tetrakis(ethylenediamine)dinickel(II) chloride". Inorganic Chemistry. 18 (3): 804–808. doi:10.1021/ic50193a054.


 

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