Potassium tetracarbonyliron hydride

Potassium tetracarbonyliron hydride

Names
Other names potassium tetracarbonylhydroferrate(1-)
Identifiers
CAS Number	17857-24-8
3D model (JSmol)	Interactive image
PubChem CID	13932590
InChI InChI=1S/4CO.Fe.K.H/c4*1-2;;;/q;;;;-1;+1; Key: ZCWNHXZCHBPQAK-UHFFFAOYSA-N
SMILES [C-]#[O+].[C-]#[O+].[C-]#[O+].[C-]#[O+].[K+].[Fe][H-]
Properties
Chemical formula	C4HFeKO4
Molar mass	207.991 g·mol−1
Appearance	yellow solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Potassium tetracarbonyliron hydride is the inorganic salt with the formula K[HFe(CO)₄]. A pale yellow solid, it is the potassium salt of [HFe(CO)₄]⁻, which is the conjugate base of iron tetracarbonyl dihydride:^[1][2]

H₂Fe(CO)₄ + KOH → K[HFe(CO)₄] + H₂O

Potassium tetracarbonyliron hydride is prepared by treating iron pentacarbonyl with potassium hydroxide:^[3]

Fe(CO)₅ + 2 KOH → K[HFe(CO)₄] + KHCO₃

Potassium tetracarbonyliron hydride is an intermediate in the synthesis of trisubstituted phosphine complexes:^[4]

K[HFe(CO)₄] + 3 PBu₃ + EtOH → Fe(CO)₂(PBu₃)₃ + EtOK + 2 CO + H₂