Ba4(BS3S)2S4: a new thioborate with unprecedented [BS3-S] and [S4] fundamental building blocks

Abstract

Ba₄(BS₃S)₂S₄ with unprecedented [BS₃-S] and [S₄] units has been synthesized successfully. The [BS₃-S] unit named as (disulfido)bis(sulfido)borate(3-) is composed of a planar [BS₃] group with a non-polar covalent S–S bond and stabilized by a large π-conjugation structure. The [S₄] unit, formed by four S atoms, shows a helix chain-like structure. This work will enrich the structural diversity of boron chemistry.