Abstract
Dissociation constants (KD) and solvatochromic shifts of the Soret bands of the dicationic form of hematoporphyrin dichloride were measured against the solvatochromic parameters of Taft, Dimroth, Gutmann and Swan. Taft's parameter β representing solvent capacity of proton acceptance from the solutes was accepted as the best cybotactic parameter. Soret bands of the spectrum undergo blue shifts upon changing nonpolar to polar solvents. The difference in hydrogen bond energy calculated between the pyrrolic proton and Cl− in hexane and isopropanol is 2.8 kcal/mol.
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