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2005
Structure
D 2000
07- 008
New Ternary Iodides of Lanthanum and Cerium, AIIMI4 (A: Sr, Ba, Nd, Sm, Eu;
M: La, Ce). — Black single crystals of nine title compounds are prepared by reduction
of AI3 (A: Sr, Ba, Nd, Sm, Eu) with La or Ce (sealed tantalum containers, 780—850 °C,
4 d). The compounds crystallize in the monoclinic space group I2/a with Z = 4 and are
isotypic with BaLaI4. The most important structural feature are chains of face-sharing
MI8 square antiprisms (M: La and Ce) in accordance with the formula A[MI8/2]. The
title iodides are expected to be one-dimensional metals according to the formulation
(A2+)(M 3+)(e-)(I-)4 with the excess electron residing in a 5d band. — (GERLITZKI, N.;
HAMMERICH, S.; MEYER*, G.; Z. Anorg. Allg. Chem. 630 (2004) 13-14,
2431-2433; Inst. Anorg. Chem., Univ. Koeln, D-50939 Koeln, Germany; Eng.) —
Schramke
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