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A New $\rm{^{1}_{\infty }}$ [Ni 7 ] Cluster in LaNi 7 In 6 and Distorted bcc Indium Cubes in LaNiIn 4
Author(s) -
Kalychak Yaroslav M.,
Zaremba Vasyl′ I.,
Galadzhun Yaroslav V.,
Miliyanchuk Khrystyna Yu.,
Hoffmann RolfDieter,
Pöttgen Rainer
Publication year - 2001
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20011217)7:24<5343::aid-chem5343>3.0.co;2-#
Subject(s) - indium , crystallography , nickel , orthorhombic crystal system , materials science , lanthanum , crystal structure , cluster (spacecraft) , ternary operation , metal , substructure , chemistry , inorganic chemistry , metallurgy , computer science , programming language , structural engineering , engineering
LaNiIn 4 and LaNi 7 In 6 were prepared by reaction of the elements in an arc melting furnace and subsequent annealing at 870 K for five weeks. Both compounds were investigated by X‐ray diffraction on powders and single crystals and the structures were refined from single‐crystal data: Cmcm, a =448.2(1), b =1689.5(4), c =722.1(1) pm, wR 2=0.0340, 472 F 2 values, 24 variables for LaNiIn 4 , and Ibam, a =806.6(2), b =924.8(2), c =1246.5(2) pm, wR 2=0.0681, 726 F 2 values and 40 variables for LaNi 7 In 6 . LaNiIn 4 adopts the YNiAl 4 ‐type structure. The nickel and indium atoms form a three‐dimensional infinite [NiIn 4 ] polyanion in which the lanthanum atoms fill distorted hexagonal channels. No Ni−Ni contacts occur. The indium substructure consists of distorted bcc ‐like indium cubes. LaNi 7 In 6 crystallizes with a peculiar new structure type. The nickel atoms build a $\rm{^{1}_{\infty }}$ [Ni 7 ] cluster unit with Ni−Ni distances ranging from 249 to 269 pm. The cluster units are enveloped by indium atoms. These larger units show an orthorhombic rod packing with the lanthanum atoms filling the space between the rods. Several nickel clusters in ternary rare earth metal nickel indides and the structural relations of the LaNi 7 In 6 structure with the cubic NaZn 13 type are discussed.