The first example of a protonated and a rare example of a metal complex of the tetrahedral tetrel cluster anion [Ge₄]⁴⁻ was obtained from a solution of K₆Rb₆Ge₁₇ in liquid ammonia in the presence of ZnPh₂ and [18]crown-6. In [K([18]crown-6)][Rb([18]crown-6)]₂[HGe₄ZnPh₂]·8NH₃ (1) one ZnPh₂ molecule and one H atom are bound to opposite, significantly elongated edges of a distorted Ge₄ tetrahedron. DFT calculations confirm the experimentally found interatomic distances and reveal a structural proof of a three-center two-electron Ge–H–Ge bond.

中文翻译：

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[（μ ₂ -H）（η ² -Ge ₄）ZnPh ₂ ] ^3-，边缘上质子化Ê ₄集群建立第一三中心两电子戈-H-Ge结合†

在ZnPh ₂和[18]存在下，由K ₆ Rb ₆ Ge ₁₇在液氨中的溶液获得四面体簇簇阴离子[Ge ₄ ] ^4-的质子化和稀有金属配合物的第一个实例。] crown-6。在[K（[18] crown-6）] [Rb（[18] crown-6）] ₂ [HGe ₄ ZnPh ₂ ]·8NH ₃（1）中，一个ZnPh ₂分子和一个H原子显着结合。扭曲的Ge _4的细长边缘四面体。DFT计算证实了实验发现的原子间距离，并揭示了三中心两电子Ge–H–Ge键的结构证明。