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Multi‐Center vs. Two‐Center Bonding within the Hetero‐Polyanion in Eu 2 GaPt 2 and its Prototype Ca 2 SiIr 2
Author(s) -
Pöttgen Rainer,
Borrmann Horst,
Grin Yuri
Publication year - 2017
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.201700069
Subject(s) - crystallography , tantalum , iridium , gallium , center (category theory) , europium , silicon , crystal structure , materials science , platinum , chemistry , infrared spectroscopy , single crystal , luminescence , catalysis , biochemistry , optoelectronics , organic chemistry , metallurgy
The compound Eu 2 GaPt 2 was synthesized from the elements in a sealed tantalum tube. Its Ca 2 SiIr 2 ‐type crystal structure was refined from single‐crystal X‐ray diffraction data: space group C 2/ c, a = 9.8775(6), b = 5.8621(6), c = 7.9677(5) Å, β = 102.257(4)°, R F = 0.039, 1344 observed reflections, and 25 variable parameters. The platinum (iridium) atoms in Eu 2 GaPt 2 and Ca 2 SiIr 2 form linear chains of dumbbells [2 c (Pt–Pt) or 2 c (Ir–Ir) bonds, respectively]. These chains are interconnected to 2D polyanions in Eu 2 GaPt 2 by the gallium atoms forming 4 c (Ga–Pt–Ga–Pt) or by silicon atoms forming 2 c (Si–Ir) bonds in Ca 2 SiIr 2 . The polyanion bonds to the europium (calcium) matrix via the pseudo lone‐pairs at the gallium (silicon) atoms.