A series
of B←N coordinated tetrahydrodibenzo[a,i]phenanthridine-based
polycyclic aromatic hydrocarbons (PAHs) have been designed and synthesized.
All of these compounds have been characterized by multinuclear NMR
spectroscopy and high-resolution mass spectrometry. Compounds 1, 2, 4, and 7 have
also been characterized by single-crystal X-ray diffraction analysis.
Our newly synthesized compounds exhibit good luminescence quantum
yields in solution and moderate quantum yields in the solid state.
Furthermore, the compounds show a large Stokes shift in comparison
to the well-known boron–dipyrromethene dyes.
B ← N coordinated phenanthroimidazole dimers exhibit excellent fluorescence quantum yields in solution and conjugation length dependant two-photon-absorption properties.
The construction of thiophene-fused analogues of diboraanthracenes with different aryl substituents through boron-mercury exchange followed by the nucleophilic replacement of the chlorines of dichlorodiboradithiophene 2 with Grignard reagents is reported....
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