Cs5Sb8 und β-CsSb: Zwei neue binäre Zintl-Phasen
Abstract
deDer Anionenteilverband in der Kristallstruktur der aus den Elementen zugänglichen Zintl-Phase Cs5Sb8 (monoklin, Raumgruppe P21/c, a = 724.4(2) pm, b = 1135.2(3) pm, c = 2750.9(8) pm, β = 96.663(5)°, Z = 4) besteht aus zwei- und dreibindige Sb-Atomen, die zu gewellten Schichten aus 5- und 28-gliedrigen Ringen verknüpft sind. β-CsSb (monoklin, Raumgruppe P21/c, a = 1519.4(3) pm, b = 734.0(2) pm, c = 1432.2(2) pm, β = 113.661(3)°, Z = 4) kristallisiert in einer Überstrukturvariante des LiAs-Typs. Wie in der α-Phase (NaP-Typ), bilden zweibindige Sb--Atome fast ideale helikale 41 Ketten, wobei im Unterschied zur α-Form Helices beider Chiralitäten auftreten.
Abstract
enCs5Sb8 and β-CsSb: Two New Binary Zintl Phases
The anion in the crystal structure of the new Zintl phase Cs5Sb8 synthesized from the elements (monoclinic, space group P21/c, a = 724.4(2) pm, b = 1135.2(3) pm, c = 2750.9(8) pm, β = 96.663(5)°, Z = 4) consists of two and three bonded Sb atoms, which are connected to form puckered nets with 5 and 28 membered rings. β-CsSb (monoclinic, space group P21/c, a = 1519.4(3) pm, b = 734.0(2) pm, c = 1432.2(2) pm, β = 113.661(3)°, Z = 4) crystallizes with a superstructure of the LiAs structure type. As in the α phase (NaP type), twobonded Sb- atoms form neary ideal 41 screx chains. In contrast to the α phase the helices have opposite chirality.
