Premium
New Indium‐Rich Compounds EuRhIn 2 and EuRh 2 In 8
Author(s) -
Pöttgen Rainer,
Kußmann Dirk
Publication year - 2001
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(200101)627:1<55::aid-zaac55>3.0.co;2-2
Subject(s) - indium , rhodium , crystallography , zintl phase , substructure , tantalum , chemistry , materials science , crystal structure , metallurgy , biochemistry , structural engineering , engineering , catalysis
EuRhIn 2 and EuRh 2 In 8 were obtained by reacting the elements in sealed tantalum tubes in a high‐frequency furnace in a water‐cooled quartz glass sample chamber. Both indides were investigated by X‐ray powder and single crystal techniques: Cmcm , oC16, a = 432.2(1), b = 1058.8(1), c = 805.5(2) pm, wR 2 = 0.0393, 471 F 2 values, 16 variables for EuRhIn 2 and Pbam , oP44, a = 1611.8(2), b = 1381.7(2), c = 436.44(6) pm, wR 2 = 0.0515, 1592 F 2 values, 70 variables for EuRh 2 In 8 . EuRhIn 2 adopts the MgCuAl 2 type structure and may be considered as a rhodium filled variant of the binary Zintl phase EuIn 2 . The indium substructure is homeotypic to the lonsdaleite type. Within the three‐dimensional [RhIn 2 ] polyanion the strongest bonding interactions occur for the Rh–In contacts followed by In–In. EuRh 2 In 8 is the first indide with CaCo 2 Al 8 type structure. The rhodium atoms have a trigonal prismatic indium coordination and the indium atoms form distorted indium centered InIn 8 cubes and InIn 10 pentagonal prisms with In–In distances ranging from 288 to 348 pm. Again, the rhodium and indium atoms together build a complex three‐dimensional [Rh 2 In 8 ] polyanion in which the europium atoms are located within distorted pentagonal channels. Chemical bonding in EuRhIn 2 and EuRh 2 In 8 is briefly discussed.