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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 4
BKCSDE 25(4)
April 20, 2004 
 
Title
 Synthesis and Crystal Structure of a New Quaternary Chalcoantimonide: KLa2Sb3S9 and KSm2Sb3Se8
Author
 Sung-Jin Kim*, Sunju Park, Sunah Yim
Keywords
 Quaternary chalcoantimonide, Rare-earth quaternary, Flux Gd2S3-type, Chalcogen-chalcogen bond
Abstract
 Silver-needle shaped crystals of KLa2Sb3S9 from K2Sx flux and KSm2Sb3Se8 from NaCl/KCl flux reactions were obtained and their crystal structures were determined by the single crystal X-ray diffraction method. KLa2Sb3S9 crystallizes in the orthorhombic noncentrosymmetric space group P212121 (No.19) with a unit cell of a = 4.220(3) Å, b = 24.145(2) Å, c = 14.757(5) Å and Z = 4. KSm2Sb3Se8 crystallizes in the orthorhombic space group Pnma (No.62) with a unit cell of a = 16.719(3) Å, b = 4.1236(8) Å, c = 22.151(4) Å and Z = 4. Both structures have three-dimensional tunnel frameworks filled with K+ ions. KSm2Sb3Se8 is an ordered version of ALn1 ± xBi4 ± xS8, and it is made up of NaCl-type and Gd2S3-type fragments. KLa2Sb3S9 also contains building fragments similar to those of KSm2Sb3Se8, however, there are chalcogen-chalcogen bonds in theGd2S3-type fragment. The formula of KLa2Sb3S9 can be described as (K+)(La3+)2(Sb3+)3(S2-)7(S22-).
Page
 485 - 490
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