Premium
Syntheses and Structures of RE 4 Pt 10 In 21 ( RE = La–Nd)
Author(s) -
Zaremba Vasyl I.,
Hlukhyy Viktor,
Rodewald Ute Ch.,
Pöttgen Rainer
Publication year - 2005
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.200400530
Subject(s) - lanthanum , crystallography , cerium , tantalum , analytical chemistry (journal) , ampoule , electron microprobe , materials science , single crystal , chemistry , mineralogy , metallurgy , inorganic chemistry , chromatography
The isotypic indides RE 4 Pt 10 In 21 ( RE = La, Ce, Pr, Nd) were prepared by melting mixtures of the elements in an arc‐furnace under an argon atmosphere. Single crystals were synthesized in tantalum ampoules using special temperature modes. The four samples were studied by powder and single crystal X‐ray diffraction: Ho 4 Ni 10 Ga 21 type, C 2/ m , a = 2305.8(2), b = 451.27(4), c = 1944.9(2) pm, β = 133.18(7)°, wR2 = 0.045, 2817 F 2 values, 107 variables for La 4 Pt 10 In 21 , a = 2301.0(2), b = 448.76(4), c = 1941.6(2) pm, β = 133.050(8)°, wR2 = 0.056, 3099 F 2 values, 107 variables for Ce 4 Pt 10 In 21 , a = 2297.4(2), b = 447.4(4), c = 1939.7(2) pm, β = 132.95(1)°, wR2 = 0.059, 3107 F 2 values, 107 variables for Pr 4 Pt 10 In 21 , and a = 2294.7(4), b = 446.1(1), c = 1938.7(3) pm, β = 132.883(9)°, wR2 = 0.067, 2775 F 2 values, 107 variables for Nd 4 Pt 10 In 21 . The 8 j In2 positions of all structures have been refined with a split model. The In1 sites of the lanthanum and the cerium compound show small defects, leading to the refined composition La 4 Pt 10 In 20.966(6) and Ce 4 Pt 10 In 20.909(6) for the investigated crystals. The same position shows Pt/In mixing in the praseodymium and neodymium compound leading to the refined compositions Pr 4 Pt 10.084(9) In 20.916(9) and Nd 4 Pt 10.050(9) In 20.950(9) . All platinum atoms have a tricapped trigonal prismatic coordination by rare‐earth metal and indium atoms. The shortest interatomic distances occur for Pt–In followed by In–In. Together, the platinum and indium atoms build up three‐dimensional [Pt 10 In 21 ] networks in which the rare earth atoms fill distorted pentagonal tubes. The crystal chemistry of RE 4 Pt 10 In 21 is discussed and compared with the RE 4 Pd 10 In 21 indides and isotypic gallides.