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Complex Three-Dimensional [Au3In5] Polyanions in Ln2Au3In5 (Ln=Ce, Pr, Nd, Sm)

✍ Scribed by Yaroslav V. Galadzhun; Rolf-Dieter Hoffmann; Rainer Pöttgen; Martin Adam

Book ID
102605016
Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
331 KB
Volume
148
Category
Article
ISSN
0022-4596

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✦ Synopsis

The four isotypic title compounds were prepared from the elements by reactions in an arc-melting furnace and subsequent annealing in sealed silica tubes at 970 K. The structure of the cerium compound was solved from single crystal X-ray di4ractometer data: Pmn2 1 , oP80, a ‫؍‬ 465.27(8) pm, b ‫؍‬ 5348.3(9) pm, c ‫؍‬ 740.5(1) pm, R1 ‫؍‬ 0.0735, 5552 F 2 values, 243 variables, and BASF ‫؍‬ 0.48(2). The structure of Ce 2 Au 3 In 5 is composed of a complex three-dimensional [Au 3 In 5 ] polyanion with a large variety of Au+In and In+In bonds. The cerium atoms are embedded in distorted pentagonal and hexagonal channels within this polyanion. The crystal chemical relationship of the Ce 2 Au 3 In 5 structure with the structures of the related stannides Y 2 Rh 3 Sn 5 (oC40, Cmc2 1 ) and Yb 2 Pt 3 Sn 5 (oP40, Pnma) is discussed. The di4erences in these three structure types result from a di4erent ordering of the transition metal and tin(indium) atoms within the polyanionic network. Temperature-dependent magnetic susceptibility measurements of Ce 2 Au 3 In 5 show modi5ed Curie+Weiss behavior with 0 ‫؍‬ 5.2؋10 !9 m 3 /mol, ‫؍‬ ؊16(1) K, and exp ‫؍‬ 2.51(2) B /Ce, indicating trivalent cerium. No magnetic ordering could be observed down to 2 K.

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