A Cyclopentadienide Analogue Containing Divalent Germanium and a Heavy Cyclobutadiene-like Dianion with an Unusual Ge4 Core

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• 作者：Wenyuan Wang ; Shenglai Yao ; Christoph van Wü ; llen ; Matthias Driess
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：July 30, 2008
• 年：2008
• 卷：130
• 期：30
• 页码：9640-9641
• 全文大小：138K
• 年卷期：v.130,no.30(July 30, 2008)
• ISSN：1520-5126

文摘

The first isolable cyclogermylidenide salt 2 has been synthesized and isolated by facile dehalogenation of the N-heterocyclic chlorogermylene 1 with elemental potassium in ether and isolated in the form of yellow crystals in 33% yield. Single-crystal X-ray diffraction analysis revealed that 2 crystallizes as a dimeric half-sandwich complex of aromatic C₃NGe rings interconnected via intermolecular Ge(II)→K dative bonds. Its yield can be improved up to 42% by gentle reduction of 1 (or its related GeCl₃ complex 8) using potassium graphite. Additionally, the remarkable K₂Ge₄ cluster compound 9 has been isolated as a side product which consists of an unusual dianionic Ge₄ core with parallelogram configuration and pronounced aromaticity as indicated by highly negative NICS values.