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Front Cover: Potassium Salts of 2,5‐Bis(trimethylsilyl)‐Germolide: Switching between Aromatic and Non‐Aromatic States (Chem. Eur. J. 46/2019)
Author(s) -
Dong Zhaowen,
Schmidtmann Marc,
Müller Thomas
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201903236
Subject(s) - chemistry , aromaticity , potassium , delocalized electron , alkali metal , salt (chemistry) , trimethylsilyl , ring (chemistry) , ion , tetraphenylethylene , front cover , metathesis , alicyclic compound , crystallography , medicinal chemistry , polymer chemistry , molecule , organic chemistry , cover (algebra) , polymerization , physics , quantum mechanics , fluorescence , aggregation induced emission , polymer , mechanical engineering , engineering
Aromaticity becomes germane, the germanium version of cyclopentadienide (Cp − ) : The potassium salt of a planar aromatic germacyclopentadienide was synthesized by the reduction of a 1‐mesityl‐2,5‐bis‐trimethylsilylchlorogermole with two equivalents of KC 8 . Its solid‐state structure revealed contact ion pairs with the potassium ion η 5 ‐coordinated to the germacyclopentadienide ring. Complexation of the potassium cation with 18‐crown‐6 triggers the structural switch to the non‐planar isomer with a localized structure. This work shows for the first time clear structural evidence for the switch between the delocalized, aromatic form and the localized, diene‐like isomer of a heterole anion triggered by the coordination of an alkali metal cation. More information can be found in the Full Paper by T. Müller et al. on page 10858.