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- W1997248941 abstract "Zartgelbe, lattenförmige Einkristalle des ternären Kupfer(I)-Yttrium(III)-Sulfids CuYS2 erhält man durch Oxidation eines äquimolaren Gemenges der Metalle (Kupfer und Yttrium) mit Schwefel im molaren Verhältnis von 1 : 1 : 2 innerhalb von vierzehn Tagen bei 900 °C in evakuierten Quarzglasampullen, wobei die Gegenwart von CsCl als Flußmittel das Kristallwachstum fördert. Die Kristallstruktur von CuYS2 (orthorhombisch, Pnma; a = 1345,3(1); b = 398,12(4); c = 629,08(6) pm; Z = 4) weist parallel [010] verlaufende Ketten {[Cu(S1)3/3(S2)1/1]3–} aus cis-kantenverknüpften [CuS4]7–-Tetraedern auf, die nach Art einer dichtesten Stabpackung hexagonal gebündelt sind und durch oktaedrisch koordinierte Y3+-Kationen dreidimensional vernetzt werden. Diese bilden mit den S2–-Anionen ein Netzwerk [Y(S1)3/3(S2)3/3]– ecken- und kantenverknüpfter [YS6]9–Oktaeder nach Art der Ramsdellit-Topologie aus. Die Metall-Schwefel-Abstände in den [CuS4]7–-Tetraedern überstreichen mit 230 (Cu–S2), 232 (Cu–S1) und 253 pm (Cu–S1′, 2 ×) ein sehr weites Intervall, während jene (Y–S: 267–280 pm) in den [YS6]9–-Oktaedern recht eng beieinanderliegen. CuYS2: A Ternary Copper(I) Yttrium(III) Sulfide with Chains {[Cu(S1)3/3(S2)1/1]3–} of cis-Edge Connected [CuS4]7– Tetrahedra Pale yellow, lath-shaped single crystals of the ternary copper(I) yttrium(III) sulfide CuYS2 are obtained by the oxidation of equimolar mixtures of the metals (copper and yttrium) with sulfur in the molar ratio 1 : 1 : 2 within fourteen days at 900 °C in evacuated silica ampoules, while the presence of CsCl as fluxing agent promotes their growth. The crystal structure of CuYS2 (orthorhombic, Pnma; a = 1345.3(1), b = 398.12(4), c = 629.08(6) pm, Z = 4) exhibits chains of cis-edge linked [CuS4]7– tetrahedra with the composition {[Cu(S1)3/3(S2)1/1]3–} running along [010] which are hexagonally bundled as closest rod packing. Charge equalization and three-dimensional interconnection of these anionic chains occur via octahedrally coordinated Y3+ cations. These are forming together with the S2– anions a network [Y(S1)3/3(S2)3/3]– of vertex- and edge-shared [YS6]9– octahedra with ramsdellite topology. The metall-sulfur distances of the [CuS4]7– tetrahedra (230 (Cu–S2), 232 (Cu–S1), and 253 pm (Cu–S1′, 2 × )) cover a very broad interval, whilst these (Y–S: 267–280 pm) within the [YS6]9– octahedra range rather closely together." @default.
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- W1997248941 date "2000-07-01" @default.
- W1997248941 modified "2023-09-24" @default.
- W1997248941 title "CuYS2: Ein ternäres Kupfer(I)-Yttrium(III)-Sulfid mit Ketten∞1{[Cu(S1)3/3(S2)1/1]3-}cis-kantenverknüpfter [CuS4]7--Tetraeder" @default.
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