In chemistry and materials science, thiosilicate refers to materials containing anions of the formula [SiS2+n]2n−. Derivatives where some sulfide is replaced by oxide are also called thiosilicates, examples being materials derived from the oxohexathiodisilicate [Si2OS6]6−. Silicon is tetrahedral in all thiosilicates and sulfur is bridging or terminal. Formally such materials are derived from silicon disulfide in analogy to the relationship between silicon dioxide and silicates. Thiosilicates are typically encountered as colorless solids. They are characteristically sensitive to hydrolysis. They are from the class of chalcogenidotetrelates.
Structure of Fe2(SiS4). Fe is octahedral coordination, Si is tetrahedral. sulfides are bridging.[1] Color code: S = yellow, Fe = blue, Si = orange.
Materials science
The LISICON (LIthium Super Ionic CONductor) include thiosilicates, which are fast ion conductors.[2] Thiosilicates and related thiogermanates are also of interest for infrared optics, 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 Fe2SiS4 and 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, Dajiang; 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. PMID22434416.
