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La 2 XB 3 (X = Cl, Br): A Novel Layered Structure with Planar Boron Nets of B 3 , B 6 and B 8 Rings
Author(s) -
Zeng HuiYi,
Lukachuk Mar'yana,
Okudera Hiroki,
Zheng Chong,
Mattausch Hansjürgen,
Simon Arndt
Publication year - 2007
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.200700040
Subject(s) - bromide , crystallography , boron , halide , halogen , crystal structure , atom (system on chip) , chemistry , chloride , materials science , inorganic chemistry , embedded system , computer science , alkyl , organic chemistry
Two new layered rare earth boride halides, La 2 XB 3 (X = Cl, Br) have been synthesized. They crystallize in the space group $P{\bar 6}$ (No. 174) with a = 7.872(1) Å, c = 8.219(2) Å, V = 441.1(1) Å 3 for the chloride, and with a = 7.834(1) Å, c = 8.440(1) Å, V = 448.6(1) Å 3 for the bromide compound, respectively. The crystals of La 2 ClB 3 are twinned resulting in an apparent symmetry P 6/ mmm (No. 191). In the crystal structure of La 2 XB 3 , trigonal La 6 prisms are condensed into sheets in the a‐b plane, and the halogen atoms X sandwich the La double layers. The connection of B atoms which center the prisms and rectangular prism faces leads to B nets of B 3 , B 6 and B 8 rings embedded between the La atom double layers. The chemical bonding is analyzed for the well ordered bromide, and the characteristic disorder in the chloride is discussed.