Systematic studies on selenoborates containing a B12 cluster entity and alkali metal cations led to the new crystalline phase Na2[B18Se16] which consists of a icosahedral B12 cluster completely saturated with trigonal‐planar BSe3 units and sodium counter‐ions. The cluster entities are connected to each other via seleno‐ and perselenobridges. Thus a three‐dimensional network results with [(B18Se12Se6/2)n]2−‐ and [(B18Se15Se6/2)n]2− anions in a ratio of 2:1. The new chalcogenoborate was prepared in a solid state reaction from sodium selenide, amorphous boron and selenium in evacuated carbon coated silica tubes at a temperature of 850 °C. Na2[B18Se16] crystallizes in the trigonal space group ${\rm P}{\bar 3}$ (no. 147) with a = 17.021(1) Å, c = 8.903(1) Å and Z = 3.
Systematic studies on selenoborates containing a B12 cluster entity and alkali metal cations led to the new crystalline phase Na8[B12(BSe3)6] which consists of a icosahedral B12 cluster completely saturated with trigonal‐planar BSe3 units and sodium counter‐ions. The new chalcogenoborate was prepared in a solid state reaction from sodium selenide, amorphous boron and selenium in evacuated carbon coated silica tubes at a temperature of 850 °C. Na8[B12(BSe3)6] crystallizes in the monoclinic space group P21/c (no. 14) with a = 10.990(1) Å, b = 16.279(1) Å, c = 11.490(1), β = 117.82(1)° and Z = 2.
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