Olefin-mediated interaction observed for nickel tetraphenylporphyrins with an acceptor substituted on the β-carbon

[GRAPHICS] A new series of acceptor substituted nickel tetraphenylporphyrins were synthesized in order to examine the efficiency of the pi-conjugation through the olefinic linkages to the beta-carbon of porphyrins. perturbed absorption spectra were found for the substituted porphyrins and may be attributed to the reduced symmetry of porphyrins, although such a symmetry factor is acceptor strength dependent. A stronger interaction than previously realized for the beta-carbon substituted porphyrins exists between the porphyrin,pi-system and through an olefin-linked electron acceptor.