Thiosilicate

Inchemistryandmaterials science,thiosilicaterefers to materials containinganionsof the formula[SiS_2+n]²ⁿ⁻.Derivatives where some sulfide is replaced byoxideare also called thiosilicates, examples being materials derived from the oxohexathiodisilicate[Si₂OS₆]⁶⁻.Silicon istetrahedralin all thiosilicates and sulfur is bridging or terminal. Formally such materials are derived fromsilicon disulfidein analogy to the relationship betweensilicon dioxideandsilicates.Thiosilicates are typically encountered as colorless solids. They are characteristically sensitive tohydrolysis.They are from the class ofchalcogenidotetrelates.

Structure ofFe₂(SiS₄).Fe is octahedral coordination, Si is tetrahedral. sulfides are bridging.^[1]Color code: S = yellow, Fe = blue, Si = orange.

Materials science

TheLISICON(LIthium Super Ionic CONductor) include thiosilicates, which arefast ion conductors.^[2]Thiosilicates and relatedthiogermanatesare also of interest forinfraredoptics, since they only absorb low frequency IR modes.^[3]

References

^Vincent, H.; Bertaut, E. F.; Baur, W. H.; Shannon, R. D. (1976). "Polyhedral deformations in olivine-type compounds and the crystal structure of Fe₂SiS₄and Fe₂GeS₄".Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry.32(6): 1749–1755.Bibcode:1976AcCrB..32.1749V.doi:10.1107/S056774087600633X.
^Morimoto, Hideyuki; Yamashita, Hideki; Tatsumisago, Masahiro; Minami, Tsutomu (1999). "Mechanochemical synthesis of new amorphous materials of 60Li2S·40SiS2 with high lithium ion conductivity".Journal of the American Ceramic Society.82(5): 1352–1354.doi:10.1111/j.1151-2916.1999.tb01923.x.
^Yin, Wenlong; Feng, Kai; He, Ran; Mei, Da gian g; Lin, Zheshuai; Yao, Jiyong; Wu, Yicheng (2012). "BaGa₂MQ₆(M = Si, Ge; Q = S, Se): A New Series of Promising IR Nonlinear Optical Materials ".Dalton Transactions.41(18): 5653–5661.doi:10.1039/c2dt12493a.PMID 22434416.

[1] Vincent, H.; Bertaut, E. F.; Baur, W. H.; Shannon, R. D. (1976). "Polyhedral deformations in olivine-type compounds and the crystal structure of Fe₂SiS₄and Fe₂GeS₄".Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry.32(6): 1749–1755.Bibcode:1976AcCrB..32.1749V.doi:10.1107/S056774087600633X.

[2] Morimoto, Hideyuki; Yamashita, Hideki; Tatsumisago, Masahiro; Minami, Tsutomu (1999). "Mechanochemical synthesis of new amorphous materials of 60Li2S·40SiS2 with high lithium ion conductivity".Journal of the American Ceramic Society.82(5): 1352–1354.doi:10.1111/j.1151-2916.1999.tb01923.x.

[3] Yin, Wenlong; Feng, Kai; He, Ran; Mei, Da gian g; Lin, Zheshuai; Yao, Jiyong; Wu, Yicheng (2012). "BaGa₂MQ₆(M = Si, Ge; Q = S, Se): A New Series of Promising IR Nonlinear Optical Materials ".Dalton Transactions.41(18): 5653–5661.doi:10.1039/c2dt12493a.PMID 22434416.

[1]

[2]

[3]