Thiosilicate

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In

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

thiogermanates are also of interest for infrared optics, since they only absorb low frequency IR modes.[3]

References