Login / Signup

Pyrene-Fused s-Indacene.

Jason MelidonieJunzhi LiuYubin FuJan J WeigandReinhard BergerXinliang Feng
Published in: The Journal of organic chemistry (2018)
One antiaromatic polycyclic hydrocarbon (PH) with and without solubilizing tert-butyl substituents, namely s-indaceno[2,1- a:6,5- a']dipyrene (IDPs), has been synthesized by a four-step protocol. The IDPs represent the longitudinal, peri-extension of the indeno[1,2- b]fluorene skeleton towards a planar 40 π-electron system. Their structures were unambiguously confirmed by X-ray crystallographic analysis. The optoelectronic properties were studied by UV/vis absorption spectroscopy and cyclic voltammetry. These studies revealed that peri-fusion renders the IDP derivatives with a narrow optical energy gap of 1.8 eV. The maximum absorption of IDPs is shifted by 160 nm compared to the parent indenofluorene. Two quasi-reversible oxidation as well as reduction steps indicate an excellent redox behavior attributed to the antiaromatic core. Formation of the radical cation and the dication was monitored by UV/vis absorption spectroscopy during titration experiments. Notably, the fusion of s-indacene with two pyrene moieties lead to IDPs with absorption maxima approaching the near infrared (NIR) regime.
Keyphrases
  • high resolution
  • photodynamic therapy
  • single molecule
  • randomized controlled trial
  • ionic liquid
  • mass spectrometry
  • single cell
  • magnetic resonance imaging
  • nitric oxide
  • fluorescence imaging