Abstract
9-Gallafluorenes were synthesized from 9-zincafluorene·tmeda as an alternative to 2,2′-biphenylenmercury and 2,2′-dilithiobiphenyl. The zincafluorene was found to be only one possible form of a biphenylene zinc. In dependence of the synthetic conditions a dimeric zinc bridged structure resulted, too. The gallafluorenes obtained were stabilized by nitrogen donors or formed dimers in case of 9-tert-butoxygallafluorene. That means, all of these derivatives contained tetra coordinated gallium centers in a planar heterofluorene moiety. The phenyl-substituted gallafluorene as a tmeda adduct as well as an intramolecularly stabilized o-(dimethylamino)methylphenyl derivative were investigated for their luminescence properties, which were similar for both compounds and did not only show fluorescence but phosphorescence in the visible region. All new metallafluorenes have been characterized by X-ray crystallography.
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