[Nb(η⁶-C₆H₃Me₃)₂] reacts with ethylenediamine (en) solutions of K₄Ge₉ in the presence of 18-crown-6 to give [(η⁶-C₆H₃Me₃)NbHGe₆]^2– (1) and [(η⁶-C₆H₃Me₃)NbGe₆Nb(η⁶-C₆H₃Me₃)]^2– (2) as their corresponding [K(18-crown-6)]⁺ salts. The crystalline solids are dark brown, air-sensitive, and sparingly soluble or insoluble in most solvents. The [K(18-crown-6)]⁺ salts of cluster ions 1 and 2 have been characterized by energy-dispersive X-ray (EDX) analysis, NMR studies, single-crystal X-ray diffraction, and electrospray ionization time-of-flight (ESI-TOF) mass spectrometry studies. Cluster ions 1 and 2 have markedly different [Ge₆] moieties: an electron-deficient carborane-like subunit in 1 and a two-center, two-electron cyclohexane-like subunit in 2.

中文翻译：

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对比两种 [Ge6]n− 复合物中的键合极限：Wadian 多面体 (n = 2) 与类烃 2c–2e Polygermanide (n = 12)

[Nb(η ⁶ -C ₆ H ₃ Me ₃ ) ₂ ]在 18-crown-6 存在下与K ₄ Ge _{9 的}乙二胺 (en) 溶液反应生成[(η ⁶ -C ₆ H ₃ Me ₃ ) NbHGe ₆ ] ^2– ( 1 ) 和 [(η ⁶ -C ₆ H ₃ Me ₃ )NbGe ₆ Nb(η ⁶ -C ₆ H ₃ Me ₃ )] ^2– ( 2) 作为它们相应的 [K(18-crown-6)] ⁺盐。结晶固体为深棕色，对空气敏感，微溶于或不溶于大多数溶剂。团簇离子1和2的 [K(18-crown-6)] ⁺盐已通过能量色散 X 射线 (EDX) 分析、核磁共振研究、单晶 X 射线衍射和电喷雾电离时间表征-飞行 (ESI-TOF) 质谱研究。簇离子1和2具有显着不同的[葛₆ ]的部分：缺电子碳硼烷类在亚基1和一个两中心，两电子环己烷样亚基在2。