Research Progress on Synthesis and Properties of of Peripheral Aromatic Ring Fused Porphyrins
Porphyrins are crucial pigments in natural systems,and play key roles in photosynthesis,O2 transportation,etc.Considering their unique chelation cavity and planar π-framework as well as the remarkable optoelectronic and redox properties,porphyrins provide an important platform for synthesizing functional pigments.However,regular porphyrins feature 18π-conjugation system and possess inferior spectral response in the near-infrared(NIR)region,limiting the further development of applications.Many strategies have been developed to fuse aromatic system on the peripheral of porphyrins with aim of extending the conjugation skeletons and improving the absorption and emission in NIR region.In this review,we would like to summarize some typical methods in construction of β,β-and meso,β-aromatic group fused porphyrins.The maxima of absorption or emission will be listed to learn the influence of the responsive in long wavelength by the type,number and fusion-mode of aromatic units.Meanwhile,the effect of annulation on the self-assemblies,aromaticity/antiaromaticity regulation,radical stabilization,spintronic property etc will be described.In the end,we outlook the further developments of such ring-fused porphyrins in terms of synthesis and applications.
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