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 MIISnO3, MI
2SnO3 which may contain polymeric anions or may be sometimes better described as mixed oxides
These materials are semiconductors.[2]
Examples
[edit]- Barium stannate, BaSnO3 (a metastannate)
- Cobalt stannate, Co2SnO4, primary constituent of the pigment cerulean blue
- Dysprosium stannate, Dy2Sn2O7
- Lead stannate, Pb2SnO4, "Type I" lead-tin yellow
- Potassium stannate, formally potassium hexahydroxostannate(IV), formula K2Sn(OH)6
- Sodium stannate, formally sodium hexahydroxostannate(IV), formula Na2Sn(OH)6
See also
[edit]References
[edit]- ^ 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
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