Selenoantimonate: Darstellung und Struktur von Na3SbSe4, K3SbSe4 und [Ba(en)4]2[Ba(en)3](SbSe4)2/ Selenoantimonates(V): Preparation and Crystal Structure of Na3SbSe4, K3SbSe4 and [Ba(en)4]2[Ba(en)3](SbSe4)2

Abstract

Abstract The crystal structures of Na3SbSe4, K3SbSe4 and [Ba(en)4]2[Ba(en)3](SbSe4)2 contain isolated tetrahedral anions SbSe4 3-, which are the first examples of selenoantimonates(V). Na3SbSe4 (space group 143m , a = 750.1(2) pm, Z = 2) is an isotype of the (NH4)3SbS4-structure type; K3SbSe4 (space group R3c, a = 1137.5(4) pm, c = 1359.6(4) pm, Z = 6) forms a slightly distorted variant. In the crystal structure of [Ba(en)4]2[Ba(en)3](SbSe4)2 (space group P21, a = 965.8(4) pm, b = 1764.8(8) pm, c = 1463.2(6) pm, β = 90.8(1)°, Z = 2) the cations are in six- and eight-fold coordinations by the bidentate ligands.