Acetylene-Linked Bis(germaethenes): The First Molecules with Conjugated Germanium−Carbon Double Bonds 1
2000; American Chemical Society; Volume: 19; Issue: 15 Linguagem: Inglês
10.1021/om000284w
ISSN1520-6041
AutoresFrank Meiners, Wolfgang Saak, Manfred Weidenbruch,
Tópico(s)Coordination Chemistry and Organometallics
ResumoIn solution, the digermene Ar2GeGeAr2 (Ar = 2-tBu-4,5,6-Me3C6H) partly dissociates into two molecules of the germylene Ar2Ge:. The reaction of this digermene with some 1,3-diynes (RC⋮C−)2 leads to the formation of the acetylene-linked bis(germaethenes) Ar2GeC(R)C⋮C(R)CGeAr2 (R = n-C4H9 (6a), C6H5 (6b)). The conjugation between the two GeC units is reflected by the positions of the UV/vis absorptions at longest wavelengths of 518 (6a) and 595 (6b) nm. An X-ray structure analysis of 6a reveals a nearly linear C4 skeleton and short GeC bond lengths of 1.819(2) Å.
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