Trithioarsenite

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Trithioarsenite, also called sulfarsenite, is the trianion AsS3−3. It is a pyramidal anion, as is typical of other As^IIIX₃ compounds. It is generated by treatment of As₂S₃ with a sulfide:

As₂S₃ + 3 S²⁻ → 2 AsS3−3

A fundamental synthetic trithioarsenite is Na₃As₃, which features the pyramidal AsS3−3.^[1]

Thioarsenites are components of many sulfosalt minerals. An example is relatively common mineral proustite, Ag₃AsS₃,^[2]^[3]^[4] which is silver(I) trithioarsenite.

References

^ Palazzi, M. (1976). "Structure cristalline de l'orthotrithioarsénite trisodique Na₃AsS₃". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 32 (12): 3175–3177. doi:10.1107/S0567740876009898.
^ Mindat
^ Webmineral
^ Trevelyan B. 1969: The electro-optic effect in proustite. Optical and Quantum Electronics, 1(1), pp. 1969; [1]

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[1] Palazzi, M. (1976). "Structure cristalline de l'orthotrithioarsénite trisodique Na₃AsS₃". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 32 (12): 3175–3177. doi:10.1107/S0567740876009898.

[2] Mindat

[3] Webmineral

[4] Trevelyan B. 1969: The electro-optic effect in proustite. Optical and Quantum Electronics, 1(1), pp. 1969; [1]

[1]