In:
Monatshefte für Chemie - Chemical Monthly, Springer Science and Business Media LLC, Vol. 154, No. 1 ( 2023-01), p. 43-52
Kurzfassung:
Three new iridium aluminum intermetallics CaAl 4 Ir 2 , SrAl 4 Ir 2 , and EuAl 4 Ir 2 were synthesized from the elements using silica or tantalum ampoules. They crystallize in the tetragonal crystal system with space group P 4/ ncc and lattice parameters of a = 782.20(1) and c = 779.14(2) pm for CaAl 4 Ir 2 , a = 797.62(1) and c = 772.75(2) pm for SrAl 4 Ir 2 , and finally a = 791.78(5) and c = 773.31(5) pm for EuAl 4 Ir 2 . All compounds crystallize isostructurally and adopt a new structure type that can be derived from the KAu 4 In 2 type structure. To compare the structures from a crystallographic point of view, a group–subgroup relation between KAu 4 In 2 and EuAl 4 Ir 2 as well as KAu 4 In 2 and KAu 4 Sn 2 have been established using the Bärnighausen formalism. Finally, quantum-chemical calculations have been conducted, showing that in all three title compounds, a polyanionic [Al 4 Ir 2 ] δ – network exists with significant (polar) bonding interactions, while the respective Ca δ + , Sr δ + , and Eu δ + cations are located in octagonal channels. Graphical abstract
Materialart:
Online-Ressource
ISSN:
0026-9247
,
1434-4475
DOI:
10.1007/s00706-022-03005-8
Sprache:
Englisch
Verlag:
Springer Science and Business Media LLC
Publikationsdatum:
2023
ZDB Id:
1462037-6
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