Hypervalent Pentafluoroethylgermanium Compounds, [(C2F5)nGeX5−n]− and [(C2F5)3GeF3]2− (X=F,Cl; n=2–5) |
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| Authors: | Dr Stefanie Pelzer Beate Neumann Dr Hans‐Georg Stammler Dr Nikolai Ignat'ev Prof Dr Berthold Hoge |
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| Institution: | 1. Centrum für Molekulare Materialien, Fakult?t für Chemie, Anorganische Chemie, Universit?t Bielefeld, Bielefeld, Germany;2. Consultant, Merck KGaA, Darmstadt, Germany |
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| Abstract: | This paper gives an account on hypervalent fluoro‐ and chloro(pentafluoroethyl)germanium compounds. The selective synthesis of the tris(pentafluoroethyl)dichlorogermanate salt PNP](C2F5)3GeCl2] as well as its X‐ray structural analysis is described. As a representative example for pentafluoroethylfluorogermanates, the synthesis and structure of 2,4,6‐triphenylpyryliumtris(pentafluoroethyl)difluorogermanate C23H17O](C2F5)3GeF2] is reported. Fluoride‐ion affinities for pentafluoroethylgermanes were calculated using quantum chemical methods, disclosing (C2F5)3GeF as a weaker Lewis acid than (C2F5)3SiF or (C2F5)3PF2. The theoretical results were confirmed by experiments and give the basis of a synthetic protocol for (C2F5)3GeF. Pentakis(pentafluoroethyl)germanate PPh4]Ge(C2F5)5] was detected as an intermediate during the synthesis of PPh4](C2F5)4GeF] starting from tris(pentafluoroethyl)difluorogermanate and LiC2F5. |
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| Keywords: | fluoride ion affinity fluorine germanate Lewis acids pentafluoroethyl |
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