Dalton communications. Structure of the [SbI4{Me2P(CH2)2PMe2}]– anion: structural evidence for an arrested double SN2 substitution
Abstract
The antimony centre in the structurally characterised complex [H(py)2][SbI4(dmpe)][py = pyridine, dmpe = 1,2-bis(dimethylphosphino)ethane] shows significant distortions from octahedral geometry which are discussed in terms of an arrested double SN2 transition state for the nucleophilic substitution of two iodide anions by dmpe.