Abstract
Oxyquinoliziniporphyrins, novel carbaporphyrinoids that incorporate quinolizone units, were synthesized. These structures exhibit moderate diamagnetic ring currents that are greatly enhanced upon protonation. Addition of trifluoroacetic acid initially gave a monocation, but this was readily converted into a dicationic species. The aromatic character of the free base and protonated species was assessed by proton NMR, nucleus-independent chemical shift calculations, and anisotropy of induced ring current plots. Stable Ni(II) and Pd(II) complexes are also reported.
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