The electron precise [Mo3(μ3-S)(μ-S)3(dppe)3Br3]+ incomplete cuboidal complex with six cluster skeletal electrons (CSE) can be converted to the paramagnetic bicapped [Mo3(μ3-S)2(μ-S)3(dppe)3]+ cluster with an unusual seven metal electron population by treatment with tBuSNa, which simultaneously serves as a reducing agent and a source of the additional capping sulfur atom.
![Graphical abstract: Unexpected transformation of a diamagnetic Mo3(μ3-S)(μ-S)3 to a paramagnetic Mo3(μ3-S)2(μ-S)3 cluster core by reaction of [Mo3S4(dppe)3Br3]PF6 with tBuSNa](http://hg.y866.cn/compound/lib/scimg/usr/1/C0DT00675K.jpg)
