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Reduced Lanthanum Halides with Ge as Interstitials: La 2 I 2 Ge, La 2 I 2 Ge 2 , La 3 Cl 2 Ge 3 , La 3 Br 2 Ge 3 , La 3 I 3 Ge, La 6 I 5 Ge 3 and La 7+x I 12 Ge
Author(s) -
Mattausch Hansjürgen,
Zheng Chong,
Ryazanov Mikhail,
Simon Arndt
Publication year - 2005
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.200400269
Subject(s) - crystallography , germanium , octahedron , lanthanum , zigzag , halide , materials science , graphite , chemistry , crystal structure , silicon , inorganic chemistry , geometry , mathematics , metallurgy , composite material
Abstract The title compounds were synthesized from La, LaX 3 (X = Cl, Br and I) and Ge under Ar atmosphere at temperatures 860‐1200 °C. Their structures are characterized by Ge‐centered La 6 octahedra or trigonal prisms. Ge atoms form planar zigzag [ttctct] ∞ (t = trans, c = cis) chains in La 3 Br 2 Ge 3 and La 3 Cl 2 Ge 3 , graphite‐like hexagon nets in La 2 I 2 Ge 2 , but otherwise are not bonded to each other in La 2 I 2 Ge, La 2 I 2 Ge 2 , La 3 I 3 Ge, La 6 I 5 Ge 3 and La 7+x I 12 Ge (x ≈ 0.7). Computational analysis of the electronic structures of these compounds was carried out.