Dichlorobis(ethylenediamine)nickel(II)

Dichlorobis(ethylenediamine)nickel(II)
Identifiers
CAS Number	20647-35-2 ;
3D model (JSmol)	Interactive image;
PubChem CID	15553566 monomer;
	InChI InChI=1S/4C2H8N2.4ClH.2Ni/c43-1-2-4;;;;;;/h41-4H2;41H;;/q;;;;;;;;2+2/p-4 Key: RHOYQZVYDDJOIB-UHFFFAOYSA-J;
	SMILES [Ni+2]1[Cl-][Ni+2][Cl-]1.NCCN.NCCN.NCCN.NCCN.[Cl-].[Cl-];
Properties
Chemical formula	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). Infobox references

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]

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

^ State, Harold M. (1960). "Bis(Ethylenediamine)Nickel(II) Chloride". Inorganic Syntheses. 6: 198–199. doi:10.1002/9780470132371.ch63.
^ 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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[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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