Stannate

In chemistry, the term stannate or tinnate refers to compounds of tin (Sn). Stannic acid (Sn(OH)₄), the formal precursor to stannates, does not exist and is actually a hydrate of SnO₂.^[1] The term is also used in naming conventions as a suffix; for example the hexachlorostannate ion is SnCl²⁻
₆.

In materials science, two kinds of tin oxyanions are distinguished:

orthostannates contain discrete SnO⁴⁻
₄ units (e.g. K₄SnO₄) or have a spinel structure (e.g. Mg₂SnO₄)
metastannates with a stoichiometry M^IISnO₃, M^I
₂SnO₃ which may contain polymeric anions or may be sometimes better described as mixed oxides

These materials are semiconductors.^[2]

^ Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, ISBN 0-12-352651-5
^ "Preparation, characterization and structure of metal stannates: a new family of photocatalysts for organic pollutants degradation." Handbook of Photocatalysts (2010), pp. 493–510. Nova Science Publishers, Inc., Hauppauge, NY

[1] Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, ISBN 0-12-352651-5

[2] "Preparation, characterization and structure of metal stannates: a new family of photocatalysts for organic pollutants degradation." Handbook of Photocatalysts (2010), pp. 493–510. Nova Science Publishers, Inc., Hauppauge, NY

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