Magneto-chiral Effect of Optically Active Metalloporphyrin

Strong magneto-chiral effects in absorption of phenylalanine bridged chiral zinc tis-porphyrin O, O-C-2-Phe-C-2-(TPP)(2)Zn-2 were demonstrated through the comparison of natural circular dichroism and magnetic circular dichroism spectra of enantiomers, Magneto-chiral circular dichroism spectra expressed as difference between the absorption coefficients of the left circularly polarized and right circularly polarized light are given. The observed intensive magneto-chiral effect was suggested to be related with the chiral exciton coupling between two zinc porphyrin chromophores of the enantiomers.