L. Petrakis, F. Dickson
Mar 1, 1972
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Influential Citations
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Journal
Journal of Molecular Structure
Abstract
Abstract Nickel-mesoporphyrin IX dimethyl ester (Ni-MPDME) has been studied by NMR as a function of solvent, concentration and temperature. The very low concentration- and temperature-dependent data reported indicate that environmental effects within the porphyrin molecule as well as solvent-solute interaction play a significant role in determining the chemical shifts of the mesoprotons. Intermolecular association contributes significantly to the complexity of the resonances at higher concentrations. The energy of dissociation of the porphyrin dimers is of the order of 3 kcal mole −1 . This value is significantly lower than the energy reported earlier for the vanadyl porphyrin analogue.