Abstract
The kinetic HH/HD/DH/DD isotope effects of an intramolecular reversible nondegenerate double proton transfer reaction are described. The molecule studied is 8-acetyl-3,13,17-tris(2-(methoxycarbonyl)ethyl]-2,7,12,18-tetramethyl-(21H,23H)-porphyrin (acetylporphyrin, ACP) dissolved in CD 2 Cl 2 . As a thermodynamic and kinetic method we used dynamic 1 H and 13 C NMR spectroscopy of suitably 2 H, 15 N, and 13 C labeled ACP. The 15 N label was introduced at the 21, 23, and 24 positions, the 13 C label at the 6- and 7-methyl positions, and 2 H at the central proton sites, respectively
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