Na+[Me3NB12Cl11]SO2: A rare example of a sodium SO2 complex

Abstract

In the title compound, Na + [Me3NB12Cl11] - ·SO2 [systematic name: sodium 1-(trimethylammonio)undecachloro-closo-dodecaborate sulfur dioxide], the SO2 molecule is η 1 -O-coordinated to the Na + cation. Surprisingly, the SO2 molecule is more weakly bound to sodium than is found in other sodium-SO2 complexes and the SO2 molecule is essentially undistorted compared to the structure of free SO2. The Na + cation has a coordination number of eight in a distorted twofold-capped trigonal prism and makes contacts to three individual boron cluster anions, resulting in an overall three-dimensional network. Although the number of known η 1 -O-coordinated SO2 complexes is growing, sodium-SO2 complexes are still rare.