Challenges in chemical synthesis at the border of solution-based and solid-state chemistry—Synthesis and structure of [CH3CH2Ge9{Si(SiMe3)3}]2−

We present a synthetic method for a stepwise ligand exchange reaction at a Zintl ion. Herein, we functionalized the [Ge9{Si(SiMe3)3}2]2− cluster with an ethyl group by a reaction with bromoethane. The obtained anion [CH3CH2Ge9{Si(SiMe3)3}2]− was characterized by NMR spectroscopy and mass spectrometry. After addition of 2,2,2-crypt an abstraction of one silyl ligand was observed resulting in the crystallization of [K(2,2,2-crypt)]2[CH3CH2Ge9{Si(SiMe3)3}] representing the first monosilylated Ge9 Zintl cluster, which carries an additional ethyl group. The latter compound was characterized by single crystal X-ray crystallography, NMR spectroscopy, and elemental analysis.

Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research