In the title compound, Na[MeNBCl]·SO [systematic name: sodium 1-(trimethylammonio)-undeca-chloro--dodeca-borate sulfur dioxide], the SO mol-ecule is --coordinated to the Na cation. Surprisingly, the SO mol-ecule is more weakly bound to sodium than is found in other sodium-SO complexes and the SO mol-ecule is essentially undistorted compared to the structure of free SO. 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 --coordinated SO complexes is growing, sodium-SO complexes are still rare.
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