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The Structure of La 3 Au 4 In 7 and its Relation to the BaAl 4 Type
Author(s) -
Galadzhun Yaroslav V.,
Zaremba Vasyl' I.,
Kalychak Yaroslav M.,
Hoffmann RolfDieter,
Pöttgen Rainer
Publication year - 2000
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 - 10.1002/1521-3749(200008)626:8<1773::aid-zaac1773>3.0.co;2-s
Subject(s) - crystallography , lanthanum , chemistry , structure type , stereochemistry , materials science , crystal structure , inorganic chemistry
La 3 Au 4 In 7 was prepared by arc‐melting of the elements and subsequent annealing at 970 K. X‐ray diffraction of powders and single crystals yielded I 2/ m 11, mI28, a = 460.42(5) pm, b = 1389.5(1) pm, c = 1039.6(2) pm, α = 90.77(1)°, wR 2 = 0.0621, 1089 F 2 values, 46 variables. The structure of La 3 Au 4 In 7 is of a new type. It may be considered as a monoclinically distorted, ordered variant of the La 3 Al 11 type. The structural relation with the family of BaAl 4 related compounds is discussed on the basis of a group‐subgroup scheme. The gold and indium atoms in La 3 Au 4 In 7 build a three‐dimensional [Au 4 In 7 ] polyanion in which the lanthanum atoms fill distorted pentagonal and hexagonal channels. Within the polyanion short Au–In and In–In distances are indicative of strongly bonding Au–In and In–In interactions.