Electronic and conformational features of derivatives of meso-thien-2-ylporphyrins on protonation and perbromination

The effect of substituents at the meso-position on the electronic and stereochemical properties of thienylporphyrins has been investigated by analyzing the spectra of series of porphyrins. The role of conformation in dictating the extent of electronic properties have been analysed both by electronic spectroscopy and 1H NMR spectroscopy. Changes in the electronic properties of the thienylporphyrins by bringing the conformational changes by protonation at the core and perbromination at the periphery of the macrocycle have been related to the properties of chlorophyll.