IN-SITU FT-IR SPECTROELECTROCHEMICAL STUD IES OF METASTABLE STATE METALLOPORPHYRINS .1.

In this paper the infrared spectra of metastable state metalloporphyri n (where the metallopo rphyrin is the meso-tetraphenylporphyrinatomang anese (III) chlo ride [TPPMn(III)Cl] was investigated by in-situ FT-IR spectroelectrochemistry in methylene chloride (CH2Cl2) and dimethylsu lfoxide (DMSO). The results show that the oxidation state sensitive ba nds of TPPMn(III)Cl are 1490cm(-1), 1344cm(-1), 1204cm(-1), 1010cm(-1) , 806cm(-1), and these bands move to low frequency with the centre met al's oxidation state depression. When the TPPMn(III)Cl gives one elect ron loss to form monocation radical of porphyrin, the spectrum display s a special change, the 1287cm(-1) peak is the characteristic absorpti on peak of [TPPMn(III)Cl](+) monocation radical.