Шаблон:ChemboxChlorobis(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]
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:
Bond
Bond distance
Fe-P1
2.238
Fe-P2
2.256
Fe-P3
2.236
Fe-P4
2.255
Fe-Cl
2.404
Fe-H
1.313
Synthesis and reactions
The compound is synthesized according to the following idealized reaction:[3]
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]
