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We report on a study on the protonation of representative prophyrins, metalloporphyrins, porphyrin-ketones and a Pd-porphyrin Schiff base in aqueous solution and when dissolved in plasticized PVC membranes. The respective protolytic forms were characterized by absorption and emission spectra as well as apparent pK a values. It is shown that the protonation of porphyrins dissolved in PVC...
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