Pyrophosphate

Pyrophosphate

Phosphorus, P   Oxygen, O
Names
IUPAC name Diphosphate
Systematic IUPAC name Dipolyphosphate
Other names Pyrophosphate Phosphonatophosphate
Identifiers
CAS Number	14000-31-8 Y 13472-36-1 (tetrasodium decahydrate salt) N 7758-16-9 (disodium salt) N
3D model (JSmol)	Interactive image
ChEBI	CHEBI:18361 Y
ChemSpider	559142 Y
DrugBank	DB04160 Y
E number	E450 (thickeners, ...)
Gmelin Reference	26938
PubChem CID	644102
UNII	X3SSV2V6L3
InChI InChI=1S/H4O7P2/c1-8(2,3)7-9(4,5)6/h(H2,1,2,3)(H2,4,5,6)/p-4 Y Key: XPPKVPWEQAFLFU-UHFFFAOYSA-J Y InChI=1/H4O7P2/c1-8(2,3)7-9(4,5)6/h(H2,1,2,3)(H2,4,5,6)/p-4 Key: XPPKVPWEQAFLFU-XBHQNQODAI
SMILES [O-]P(=O)([O-])OP(=O)([O-])[O-]
Properties
Chemical formula	P2O4−7
Molar mass	173.941 g·mol−1
Conjugate acid	Pyrophosphoric acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

In chemistry, pyrophosphates are phosphorus oxyanions that contain two phosphorus atoms in a P−O−P linkage. A number of pyrophosphate salts exist, such as disodium pyrophosphate (Na₂H₂P₂O₇) and tetrasodium pyrophosphate (Na₄P₂O₇), among others. Often pyrophosphates are called diphosphates. The parent pyrophosphates are derived from partial or complete neutralization of pyrophosphoric acid. The pyrophosphate bond is also sometimes referred to as a phosphoanhydride bond, a naming convention which emphasizes the loss of water that occurs when two phosphates form a new P−O−P bond, and which mirrors the nomenclature for anhydrides of carboxylic acids. Pyrophosphates are found in ATP and other nucleotide triphosphates, which are important in biochemistry. The term pyrophosphate is also the name of esters formed by the condensation of a phosphorylated biological compound with inorganic phosphate, as for dimethylallyl pyrophosphate. This bond is also referred to as a high-energy phosphate bond.