Front Cover: Potassium Salts of 2, 5‐Bis(trimethylsilyl)‐Germolide: Switching between Aromatic and Non‐Aromatic States (Chem. Eur. J. 46/2019). Issue 46 (24th July 2019)

• Record Type: Journal Article
• Authors: Dong, Zhaowen; Schmidtmann, Marc; Müller, Thomas
• Is Part Of: Chemistry. Volume 25:Issue 46(2019)
• Page Start: 10763
• Page End: 10763
• Publication Date: 2019-07-24
• Subjects: aromaticity -- density functional calculations -- germacyclopentadienyl anion -- germanium -- X-ray diffraction; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201903236
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract : 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 KC8 . 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. onpage 10858 .