Trithioarsenite

Trithioarsenite, also called sulfarsenite, is the trianion AsS3−3.

It is a pyramidal anion, as is typical of other AsIIIX3 compounds.

It is generated by treatment of As2S3 with a sulfide: A fundamental synthetic trithioarsenite is Na3As3, which features the pyramidal AsS3−3.

An example is relatively common mineral proustite, Ag3AsS3,[2][3][4] which is silver(I) trithioarsenite.

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Subunit of the structure of proustite , a sulfosalt mineral. This picture shows the connectivity of the trithioarsenite trianion to Ag + (arsenic is colored violet).