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 ]Te 3 crystallizes in the monoclinic system, space group P2 1 /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 Te 3 2- (bond lengths 273.9-278.5 pm, bond angle 105.7°). The Ba 2+ cations are six coordinate by the bidentate ligand ethylenediamine. [Ba(en) 4,5 ]Te 3 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 Te 3 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 Ba 2+ cations in CN 9.
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Zagler et al. (1987) studied this question.
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