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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)
Author(s) -
Czajkowski Daniel,
Simon Ilka,
Frank Walter
Publication year - 2019
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.201970041
Subject(s) - crystallography , group (periodic table) , adduct , branching (polymer chemistry) , chemistry , metal , crystal structure , main group element , stereochemistry , materials science , organic chemistry , transition metal , catalysis
The cover picture shows structures and crystallographic relationships of four new group 1 / group 13 mixed‐metal trifluoroacetates M [ M '(O 2 CCF 3 ) 4 (C 4 H 8 O 2 ) 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 k O, k O'‐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 402 ff .