Abstract
AbstractA series of “push‐pull” porphyrins with 4‐nitrophenyl and 4‐aminophenyl substituents were synthesized and separated by flash column chromatographic techniques. They were fully characterized by elemental analysis, FAB‐MS, FTIR, UV‐visible, and 1H NMR spectroscopies. The unsymmetrical π‐electron distribution of the porphyrins caused by the donor (amino) and acceptor (nitro) substituents were investigated by 1H NMR technique. The pyrrole‐H resonance positions can be correlated to the Hammett σ constants of the substituents. Although with strong donor and acceptor substituents, UV‐visible spectra show the push‐pull porphyrins have rather weak solvatochromism and hence limited intramolecular charge‐transfer character.
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