Iron(III) pyrophosphate

Iron(III) pyrophosphate is an inorganic chemical compound with the formula Fe₄(P₂O₇)₃.

Iron(III) pyrophosphate

Names
Other names Ferric pyrophosphate
Identifiers
CAS Number	10058-44-3 (anhydrous) 10049-18-0 (nonahydrate) 1802359-96-1
3D model (JSmol)	Interactive image
ChEBI	CHEBI:132767
ChemSpider	23258 34994433
DrugBank	DB09147 DB13995
ECHA InfoCard	100.030.160
EC Number	233-190-0
PubChem CID	24877
UNII	QK8899250F 1ZJR117WBQ (nonahydrate) UBY79OCO9G
CompTox Dashboard (EPA)	DTXSID6047600
InChI Key: CADNYOZXMIKYPR-UHFFFAOYSA-B InChI=1S/4Fe.3H4O7P2/c;;;;3*1-8(2,3)7-9(4,5)6/h;;;;3*(H2,1,2,3)(H2,4,5,6)/q4*+3;;;/p-12
SMILES [Fe+3].O=P([O-])([O-])OP(=O)([O-])[O-].[Fe+3].O=P([O-])([O-])OP(=O)([O-])[O-].[Fe+3].O=P([O-])([O-])OP(=O)([O-])[O-].[Fe+3]
Properties
Chemical formula	Fe4(P2O7)3
Molar mass	745.224 (anhydrate) 907.348 (nonahydrate)
Appearance	yellow solid (nonahydrate)[1]
Solubility in water	insoluble
Pharmacology
Legal status	CA: ℞-only[2][3] US: ℞-only[4]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Anhydrous iron(III) pyrophosphate can be prepared by heating the mixture of iron(III) metaphosphate and iron(III) phosphate under oxygen with the stoichiometric ratio 1:3. The reactants can be prepared by reacting iron(III) nitrate nonahydrate with phosphoric acid.^[5]

It can be also prepared via the following reaction:^[6]

3 Na₄P₂O₇(aq) + 4 FeCl₃(aq) → Fe₄(P₂O₇)₃(s) + 12 NaCl(aq)