Polyhedral metallathiaborane chemistry: Synthesis and characterisation of metallathiaboranes based on the twelve-vertex icosahedral closo-{MSB10H10} unit, where M is Rh or Ir

A series of twelve-vertex closo-metallathiaboranes has been synthesized. Comparative analysis of NMR and X-ray diffraction data reveals metal-to-thiaborane bonding differences that have implications in the cluster structure and in the fluxional behaviour of some of the compounds.