Pyrosulfate

Chemical structure of the disulfate anion

In chemistry, disulfate or pyrosulfate is the anion with the molecular formula S
₂O²⁻
₇. Disulfate is the IUPAC name. ^[1] It has a dichromate-like structure and can be visualised as two corner-sharing SO₄ tetrahedra, with a bridging oxygen atom.^[2] In this anion, sulfur has an oxidation state of +6. Disulfate is the conjugate base of the hydrogen disulfate (hydrogen pyrosulfate) ion HS
₂O⁻
₇, which in turn is the conjugate base of disulfuric acid (pyrosulfuric acid).

^ International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSC–IUPAC. ISBN 0-85404-438-8. p. 130. Electronic version.
^ Ståhl, K.; Balic-Zunic, T.; da Silva, F.; Eriksen, K.M.; Berg, R.W.; Fehrmann, R. (October 2005). "The crystal structure determinations and refinements of K₂S₂O₇, KNaS₂O₇ and Na₂S₂O₇ from X-ray powder and single crystal diffraction data". Journal of Solid State Chemistry. 178 (10): 1697–1704. Bibcode:2005JSSCh.178.1697S. doi:10.1016/j.jssc.2005.03.022.

[1] International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSC–IUPAC. ISBN 0-85404-438-8. p. 130. Electronic version.

[2] Ståhl, K.; Balic-Zunic, T.; da Silva, F.; Eriksen, K.M.; Berg, R.W.; Fehrmann, R. (October 2005). "The crystal structure determinations and refinements of K₂S₂O₇, KNaS₂O₇ and Na₂S₂O₇ from X-ray powder and single crystal diffraction data". Journal of Solid State Chemistry. 178 (10): 1697–1704. Bibcode:2005JSSCh.178.1697S. doi:10.1016/j.jssc.2005.03.022.

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