Abstract
The ability of eight manganese (III) porphyrins to enhance the longitudinal relaxation rate of water protons in aqueous solution has been studied by nuclear magnetic resonance dispersion (NMRD). In NMRD, the relaxation rates of solvent water protons are measured as a function of proton Larmor frequency from 0.01 to 50 MHz (field strengths from 0.23 mT to 1.17 T); a plot of relaxation rate versus frequency is called an NMRD profile. To enable comparison of the data, the observed rates are expressed as relaxivities by normalizing the rates to the concentration of manganese (III) porphyrin
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