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Chlorobis(dppe)iron hydride

Chemical compound From Wikipedia, the free encyclopedia

Chlorobis(dppe)iron hydride
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Chlorobis(dppe)iron hydride is a coordination complex with the formula HFeCl(dppe)2, where dppe is the bidentate ligand 1,2-bis(diphenylphosphino)ethane. It is a red-violet solid. The compound has attracted much attention as a precursor to dihydrogen complexes.[1]

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Structure

The complex exhibits octahedral molecular geometry. The chloride and hydride ligands are mutually trans.[2] The bond distances between the iron metal atom and the coordinating ligands are given by the following:

BondBond distance
Fe-P12.238
Fe-P22.256
Fe-P32.236
Fe-P42.255
Fe-Cl2.404
Fe-H1.313

Synthesis and reactions

The compound is synthesized according to the following idealized reaction:[3]

FeCl2 + 2 dppe + Na[BH4] → NaCl + ½ B2H6 + HFeCl(dppe)2
Thumb
"Top-view" of the structure of HFeCl(dppe)2

In the course of this conversion, high-spin complex FeCl2(dppe)2 converts to low-spin HFeCl(dppe)2.

The complex HFeCl[(dppe)2 exhibits a number of reactions associated with the remaining Fe-Cl bond. Reaction of the complex with sodium borohydride gives the dihydride complex:

HFeCl(dppe)2 + NaBH4 → H2Fe(dppe)2 + NaCl + "BH3"

Removal of chloride using sodium tetrafluorborate under and atmostphere of hydrogen or nitrogen gives the dinitrogen and dihydrogen complexes:[4]

HFeCl(dppe)2 + NaBF4 + N2 → [HFe(N2)(dppe)2]BF4 + NaCl
HFeCl(dppe)2 + NaBF4 + H2 → [HFe(H2)(dppe)2]BF4 + NaCl
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References

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