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On the Oxidation of [Ge 9 ] 4− – Crystal Structures and Raman Spectroscopic Investigation of Linked Ge 9 Clusters
Author(s) -
Mayer Kerstin,
Klein Wilhelm,
Geier Sebastian,
Fässler Thomas F.
Publication year - 2021
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.202000411
Subject(s) - dimer , raman spectroscopy , crystallography , germanium , tetramer , chemistry , crystal structure , conformational isomerism , pyridine , trimer , cluster (spacecraft) , chalcogen , molecule , organic chemistry , programming language , physics , computer science , optics , enzyme , silicon
Oxidation of Ge 9 Zintl clusters can afford condensed cluster species in the form of dimers, oligomers and polymers. In this work, we present a new route for the synthesis of Ge 9 tetramers present in the compound [K(18‐crown‐6)] 8 [Ge 9 =Ge 9 =Ge 9 =Ge 9 ] ⋅ 4 pyr. The reaction of a pyridine solution of K 4 Ge 9 with 18‐crown‐6 first leads to the formation of green needles of yet unknown composition, which convert into the reported tetramer over time. In this reaction pyridine acts as oxidation reagent. Raman studies on the green needles as well as on tetrameric and polymeric Ge 9 feature complex vibrational patterns. Furthermore, we present the crystal structure of a new type of Ge 9 dimer in the compound K 4 [K(2.2.2‐crypt)] 2 [Ge 9 −Ge 9 ] ⋅ 4 en ⋅ 2 thf, which represents an intermediate between the two established conformers.