A DOSY Spectroscopy Study of Proton Exchange Processes Involving Inner N-H Protons in Natural and Synthetic Porphyrins

作者：Belykh Dmitriy V^*; Stolypko Alexander L

来源：Macroheterocycles, 2017, 10(1): 51-56.

DOI：10.6060/mhc160534b

• Porphyrins
• DOSY spectroscopy
• exchange process

DOSY spectroscopy was used to assess the involvement of inner N-H protons of porphyrinic compounds in exchange processes. The assessment was made by comparison of increase of self-diffusion coefficients of N-H and C-H protons. The difference in the measured coefficients can serve as a quantitative measure of hydrogen exchange intensity and thus of N-H acidity. Using DOSY allowed to demonstrate that regardless of the strongly different chemical shifts, the N-H bonds in porphyrins and chlorins have similar acidity and the magnetically non-equivalent inner N-H protons in chlorins have a different degree of involvement in exchange processes.

• 出版日期2017