Two valence electrons more than in square-antiprismatic 38-electron clusters such as Bi82+ or Sn86- : This is the reason for the unusual cube-shaped structure of the cation Bi4 Te44+ , which is obtained as the chloroaluminate salt from acidic AlCl3 /Na[AlCl4 ] melts.
Keywords: ab initio calculations; bismuth; cluster compounds; polycations; tellurium.
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