Accuracy of determination of self-diffusion coefficients in studies of porphyrin-based complexes by 2D DOSY

Abstract

Influence of chemical exchange processes on the accuracy of determination of self-diffusion complexes of porphyrinnickel complexes was shown. A method of estimating the inaccuracy of the self-diffusion coefficients for an inverted porphyrin complex was proposed. The values obtained using two different approaches to recording DOSY spectra, STE and CPMG, were compared. Allowing for exchange was shown to be important for accurate diffusion measurements and correct interpretation of results obtained in studied of molecular-level processes.