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Synthesis and Crystal Structure of the Rubidium Scandium Telluride RbSc 5 Te 8
Author(s) -
Babo JeanMarie,
Schleid Thomas
Publication year - 2008
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200800048
Subject(s) - scandium , crystallography , rubidium , materials science , crystal structure , octahedron , propylamine , square antiprism , chemistry , metallurgy , ion , potassium , lanthanide , organic chemistry , amine gas treating
Abstract During attempts to synthesize the rubidium dicopper triscandium hexatelluride RbCu 2 Sc 3 Te 6 in analogy to CsCu 2 Sc 3 Te 6 from 2:3:6‐molar mixtures of the elements (Cu, Sc and Te) with an excess of RbBr as flux and rubidium source, after 14 days at 900 °C in torch‐sealed evacuated silica tubes brown lath‐shaped crystals of RbSc 5 Te 8 did form instead. This new compound crystallizes monoclinically in space group C 2/ m (no. 12) with two formula units in a unit cell of the dimensions a = 2130.61(9) pm, b = 413.94(2) pm, c = 1022.03(5) pm and β = 104.392(4)°. The crystal structure of RbSc 5 Te 8 consists of a three‐dimensional anionic framework $^{3}_{\infty}\rm \{[Sc_{5}Te_{8}]^{-}\}$ of face‐, edge‐ and vertex‐sharing [ScTe 6 ] 9− octahedra that provides one‐dimensional tunnels with a distorted square shape. For charge compensation they are occupied with Rb + cations (CN = 10) coordinated in a trans ‐face bicapped cubic fashion by Te 2− anions.