La6Pd13Cd4 and Ce6Pd13Cd4 with palladium-centred rare earth octahedra: synthesis, structure, and chemical bonding |
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Authors: | Frank Tappe Samir F Matar and Rainer P?ttgen |
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Institution: | (1) Institut f?r Anorganische und Analytische Chemie, Westf?lische Wilhelms-Universit?t M?nster, Corrensstrasse 30, 48149 M?nster, Germany;(2) CNRS, ICMCB, Universit? de Bordeaux, 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac Cedex, France; |
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Abstract: | Abstract The palladium-rich cadmium compounds La6Pd13Cd4 and Ce6Pd13Cd4 were synthesized by induction melting the elements in sealed tantalum ampoules and subsequent annealing. They were characterized
by X-ray powder and single-crystal diffraction: Na16Ba6N type, Im`3] mIm\overline{3} m, a = 988.12(9) pm, wR2 = 0.0463, 225 F
2 values, and 12 variables for La6Pd13Cd4, and a = 982.1(2) pm, wR2 = 0.0521, 215 F
2 values, and 12 variables for Ce6Pd13Cd4. The striking structural motifs are palladium-centred La6 and Ce6 octahedra, which are packed in a bcc fashion. Further palladium and cadmium atoms built up three-dimensional Pd3Cd] networks in which the La6Pd and Ce6Pd octahedra are embedded. Chemical bonding analyses show that the dominant interaction occurs within the palladium-centred
RE
6 octahedra, while weaker bonding exists between them. |
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