Selenite (ion)

Selenite refers to the anion with the chemical formula Se O2−3. It is the oxyanion of selenium. It is the selenium analog of the sulfite ion, SO2−3. Thus selenite is pyramidal and selenium is assigned oxidation state +4. Selenite also refers to compounds that contains this ion, for example sodium selenite Na₂SeO₃ which is a common source of selenite.^[1] Selenite also refers to the esters of selenous acid, for example dimethyl selenite (CH₃)₂SeO₃.

Synthesis and reactions

Selenite salts can be prepared by neutralizing solutions of selenous acid, which is generated by dissolving selenium dioxide in water. The process proceeds via the hydrogenselenite ion, HSeO−3.

Most selenite salts can be formed by heating the metal oxide with selenium dioxide, e.g.:

Na₂O + SeO₂ → Na₂SeO₃

References

↑ F. Fehér (1963). "Sodium Selenite (IV)". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1pages=431. NY, NY: Academic Press.

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[1] F. Fehér (1963). "Sodium Selenite (IV)". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1pages=431. NY, NY: Academic Press.

[1]

v t e Selenium compounds
Se(−II)	Se²⁻ H₂Se Al₂Se₃ Sb₂Se₃ As₂Se₃ Bi₂Se₃ CdSe CaSe CSe₂ OCSe CrSe CoSe CuSe (CH₃)₂Se GaSe Ga₂Se₃ GeSe In₂Se₃ FeSe PbSe MgSe MnSe MnSe₂ HgSe MoSe₂ NiSe NbSe₂ NbSe₃ P_xSe_y PuSe ReSe₂ Sm₂Se₃ Ag₂Se Na₂Se SnSe TiSe₂ WSe₂ USe₂ ZnSe
Se(0,I)	Se₃S₅
Se(I)	Se₂S₆ Se₂Cl₂ C₃H₇NO₂Se
Se(II)	SeBr₂ SeCl₂ SeS₂ C₁₀H₁₂Se₄
Se(III)	Se₄N₄
Se(IV)	SeO2−3 SeBr₄ SeCl₄ SeF₄ SeO₂ SeS₂ SeOF₂ SeOCl₂ SeOBr₂ H₂SeO₃
Se(VI)	SeO2−4 SeF₆ SeO₃ SeO₂F₂ H₂SeO₄
Se(IV,VI)	SeO2−4 + SeO2−3

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Synthesis and reactions

References