Pyrosilicate

Pyrosilicate anion

Names
IUPAC name Pyrosilicate
Other names disilicate, diorthosilicate
Identifiers
3D model (JSmol)	Interactive image
ChEBI	CHEBI:29380 Y
ChemSpider	5257009 Y
Gmelin Reference	326578
PubChem CID	6857674
CompTox Dashboard (EPA)	DTXSID701336332
InChI InChI=1S/O7Si2/c1-8(2,3)7-9(4,5)6/q-6 Y Key: KUDCBYUNCUYIDU-UHFFFAOYSA-N Y
SMILES [O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-]
Properties
Chemical formula	O7Si2−6
Molar mass	168.166 g·mol−1
Conjugate acid	Pyrosilicic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N (what is YN ?) Infobox references

A pyrosilicate is a type of chemical compound; either an ionic compound that contains the pyrosilicate anion Si
₂O⁶⁻
₇, or an organic compound with the hexavalent ≡O
₃Si-O-SiO
₃≡ group. The anion is also called disilicate^[1] or diorthosilicate.

Ionic pyrosilicates can be considered salts of the unstable pyrosilicic acid, H
₆Si
₂O
₇. Unlike the acid, the salts can be stable. Indeed, pyrosilicates occur widely in nature as a class of silicate minerals, specifically the sorosilicates - though some sorosilicate minerals, such as gehlenite, replace one of the silicon atoms with tetracoordinated aluminium or boron, giving the isostructural anions AlSiO7−7 and BSiO7−7.

Some notable synthetic pyrosilicates include

• sodium pyrosilicate Na
  ₆Si
  ₂O
  ₇, a possible component of water glass.
• sodium iron(II) pyrosilicate Na
  ₂Fe
  ₂Si
  ₂O
  ₇, a potential cathode material for batteries.^[2]
• sodium manganese(II) pyrosilicate Na
  ₂Mn
  ₂Si
  ₂O
  ₇, another potential cathode material.^[3][4]