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Synthesis, characterization, and bonding of indium clusters. Rb 2 In 3 , a zintl phase with layers of closo ‐indium octahedra
Author(s) -
Slavi Sevov C.,
Corbett John D.
Publication year - 1993
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.19936190121
Subject(s) - isostructural , zintl phase , rubidium , indium , crystallography , chemistry , octahedron , group (periodic table) , ion , cluster (spacecraft) , tetrahedron , space group , phase (matter) , ionic bonding , crystal structure , physics , x ray crystallography , potassium , organic chemistry , computer science , programming language , optics , diffraction
The Rb‐In system contains only RbIn 4 (BaAl 4 type) and Rb 2 In 3 in the 0–80 at.% In region. The structure of Rb 2 In 3 consists of rubidium ions between layers of closo ‐In 6 clusters joined into sheets through exo bonds at four coplanar vertices (I4/mmm, a=6.8735 (4) Å, c=15.899 (1) Å, R(F)/R w =3.2/3.5%). The phase is isostructural with Cs 2 In 3 when a probable error in the earlier space group assignment is corrected. Rb 2 In 3 is a poor conductor (P> 10 3 μohm · cm) with a temperature‐independent magnetic susceptibility of (0 ± 4) x 10 −6 emu/mol after core and orbital corrections. The corresponding Zintl phase (closed shell configuration) predicted on the basis of conventional electron counting for the cluster network is supported by extended‐Hückel MO calculations. The structures of Rb 4 In 6 and In 4 Rb show a close, inverse relationship in the same space group.