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Preparation and Crystal Structure of the Ternary Lanthanoid Platinum Antimonides L n 3 Pt 7 Sb 4 (L n = Ce, Pr, Nd, and Sm) with Er 3 Pd 7 P 4 Type Structure
Author(s) -
Schmidt Tobias,
Jeitschko Wolfgang
Publication year - 2002
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(200206)628:5<927::aid-zaac927>3.0.co;2-c
Subject(s) - phosphide , crystal structure , crystallography , lanthanide , chemistry , antimonide , ternary operation , tetragonal crystal system , denticity , metal , programming language , ion , organic chemistry , computer science
The four compounds Ln 3 Pt 7 Sb 4 ( Ln = Ce, Pr, Nd, and Sm) were prepared from the elements by arc‐melting and subsequent heat treatment in resistance and high‐frequency furnaces. The crystal structure of these isotypic compounds was determined from four‐circle X‐ray diffractometer data of Nd 3 Pt 7 Sb 4 [ C 2/ m , a = 1644.0(2) pm, b = 429.3(1) pm, c = 1030.6(1) pm, β = 128.58(1)°, Z = 2, R = 0.032 for 698 structure factors and 46 variable parameters] and Sm 3 Pt 7 Sb 4 [ a = 1639.5(2) pm, b = 427.1(1) pm, c = 1031.8(1) pm, β = 128.76(1)°, Z = 2, R = 0.025 for 816 F ‐values and 46 variables]. The structure is isotypic with that of the homologous phosphide Er 3 Pd 7 P 4 . In contrast to the structure of this phosphide, where the phosphorus atoms have the coordination number nine, the larger antimony atoms of Nd 3 Pt 7 Sb 4 obtain the coordination number ten. The structural relationships between the structures of EuNi 2—x Sb 2 , EuPd 2 Sb 2 , CeNi 2+x Sb 2—x , Ce 3 Pd 6 Sb 5 , and Nd 3 Pt 7 Sb 4 , all closely related to the tetragonal BaAl 4 (ThCr 2 Si 2 ) type structure, are briefly discussed emphasizing their space group relationships.