Homoleptic cadmium and mercury compounds of stanna-closo-dodecaborate

The reaction of stanna-closo-dodecaborate [SnB11H11](2-) (1) with CdBr2 gave the tetrahedrally coordinated compound [Cd(SnB11H11)(4)](6-) (2). The same coordination mode can be found in [Hg(SnB11H11)(4)](6-) (3), which was obtained by reaction of stannaborate with Hg2Cl2. Both compounds were characterized by single crystal X-ray analysis and heteronuclear NMR techniques.