The title compounds have been prepared from mixtures of the elements in graphitized evacuated quartz glass ampoules. The structures have been determined by X-ray single crystal diffraction. Na 2 TeSe 3 : monoclinic, C2/c, a = 2174.1(6) pm, b = 600.1(2) pm, c = 1201.1(4) pm, β = 121.1(1)°, Ζ = 8; K 2 TeSe 3 : monoclinic, Pljc, a = 1018.1(4) pm, b = 658.6(4) pm, c = 1308.2(5) pm, β = 105.2(1)°, Ζ = 4. The structures contain isolated ψ-tetrahedral TeSe|~ anions. In Na 2 TeSe 3 and K 2 TeSe 3 as well the cations are coordinated by six neighbouring Se-atoms of four and five anions, respectively, thereby forming distorted octahedral environments.
Source of material: Synthesis from stoichiometric amounts of the elements in graphitized evacuated quartz glass ampoules at 973 K. K 3 BiTe 3 crystallizes in the Na 3 AsS 3 -type (see refs. 1 and 2). There are isolated ψ-tetrahedral [BiTe 3 ] 3anions with a bond length d(Bi-Te) = 2.883 Â and a bond angle Te-Bi-Te = 100.8°. Cubic, P2j3 (no 198), a = 10.369(3) Â, V = 1114.8 Â 3 , Ζ = 4, R = 0.054.
The new compound [Ba(en)4]2As4Te6 has been prepared by reaction of appropriate mixtures of the elements in dry ethylenediamine. It crystallizes in the monoclinic system, space group P21/n with a = 1776.0(6) pm, b = 1459.9(6) pm, c = 1000.0(4) pm, β = 101.8(1)°. The As4Te64- anion forms a six-membered ring As4Te2 of chair conformation, in which two As-As groups are bridged by Te atom s. A t each As atom a further exocyclic Te neighbour is bonded in the equatorial position. The Ba2+ cation is eight-coordinated by the bidentate ethylenediamine ligand.
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 Te32- (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 Te32- 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.
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