Tritelluride mit komplexierten Kationen: Darstellung und Kristallstruktur von [Ba(en)3]Te3 und [Ba(en)4,5]Te3/ Tritellurides of Complex Cations: Synthesis and Crystal Structure of [Ba(en)3]Te3 and [Ba(en)4,5]Te3

Abstract

Abstract The two title compounds have been prepared by reaction of appropriate mixtures of the elements in ethylenediamine. The structures have been determined on the basis of single crystal data. [Ba(en)3]Te3 crystallizes in the monoclinic system, space group P21/c with a = 918.0(4), b = 1203.7(6), c = 1639.9(6) pm, β = 93.4(1)°. In the structure there are bent tritelluride anions Te3 2- (bond lengths 273.9-278.5 pm, bond angle 105.7°). The Ba2+ cations are six coordinate by the bidentate ligand ethylenediamine. [Ba(en)4,5]Te3 crystallizes in the monoclinic system, space group Cc with a = 1752.8(6), b = 938.9(4), c = 3041.7(8) pm, β = 91.3(1)°. In this structure the bond lengths in the Te3 2- anions are shorter (272.1-273.1 pm, bond angles 110.9-112.2°). The cations are coordinated by four bidentate ligands, and are connected into pairs by a further ethylenediamine molecule. The resulting dinuclear [Ba(en)4]en[Ba(en)4]4+ units have the Ba2+ cations in CN 9.