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