Front Cover: Synthesis, Characterization, and Symmetry Relations of the Crystal Structures of Some Bis(dioxane) Adducts of Group 1 / Group 13 Heterometallic Trifluoroacetates (Z. Anorg. Allg. Chem. 4/2019)

Abstract

The cover picture shows structures and crystallographic relationships of four new group 1 / group 13 mixed‐metal trifluoroacetates M[M'(O2CCF3)4(C4H8O2)2] (M: Na, K, Cs; M': In and M: Cs; M': Ga) using elements of a Bärnighausen tree. Represented by the tree‐stem at the bottom of the picture, a hypothetical aristotype structure lays the foundation for understanding of the isotypic and homotypic crystallographic relationships: According to two different translationengleiche transitions of index 2, branching of the stem separates the four structures into two isotypic pairs. In the structures this branching is due to differing tiltings of the kO,kO'‐connecting trifluoroacetate ligands between group 1 and group 13 metal centers and 'opening' of one connection in case of the sodium and the potassium compound, respectively. More details are discussed in the article by Daniel Czajkowski, Ilka Simon, and Walter Frank on page http://onlinelibrary.wiley.com/doi/10.1002/zaac.201800470/abstract.