827347-34-2Relevant academic research and scientific papers
First introduction of an azulenyl group into the bismuth and antimony center. Synthesis and structure of azulenylbismuthanes and their difluorides
Mustafizur Rahman,Murafuji, Toshihiro,Kurotobi, Kei,Sugihara, Yoshikazu,Azuma, Nagao
, p. 6176 - 6183 (2008/10/09)
A nonalternant organyl ligand derived from azulene, a 1,3-dichloro-2- azulenyl group, is introduced for the first time into the bismuth and antimony center. Conversion of the azulenylbismuthanes into the pentacoordinated difluorides by xenon difluoride promotes the π-polarization of the azulene nucleus, which is detected as a color change in solution as well as changes in the chemical shifts of the 13C NMR spectra. A similar tendency is observed in the antimony congeners. The X-ray crystallographic study of (1,3-dichloro-2-azulenyl)-diphenylbismuth difluoride (20b) reveals that intermolecular π-π stacking takes place between the azulenyl groups through the interaction of the five-membered ring with the seven-membered ring. This may reflect the more polarized azulenyl group of the difluorides, which strengthens the stacking interaction.
