3 years ago

Cover Feature: Multi-Center vs. Two-Center Bonding within the Hetero-Polyanion in Eu2GaPt2 and its Prototype Ca2SiIr2 (Z. Anorg. Allg. Chem. 21/2017)

Cover Feature: Multi-Center vs. Two-Center Bonding within the Hetero-Polyanion in Eu2GaPt2 and its Prototype Ca2SiIr2 (Z. Anorg. Allg. Chem. 21/2017)
Horst Borrmann, Yuri Grin, Rainer Pöttgen
The Cover Feature shows atomic interactions in Eu2GaPt2, the first gallium representative of the Ca2SiIr2 type (Eu – blue, Ga – green, Pt – red spheres). A characteristic feature of this structural pattern are close Pt–Ga (blue) and Pt–Pt (red) distances. The latter form linear chains of Peierls type where the longer Pt–Pt contacts are additionally bridged by Ga atoms. Analysis of chemical bonding with the real-space techniques (QTAIM and ELI-D) reveals such atomic arrangements as formed by the two-center Pt–Pt bonds combined with the four-center Ga–Pt–Pt–Ga interactions. The [GaPt2] polyanion binds to the europium matrix via polar interactions (pseudo lone-pairs) at the Ga atoms (yellow ‘clouds’). Details are discussed in the article by Rainer Pöttgen et al. on page 1338 ff.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/zaac.201770215

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