M. Momenteau, J. Mispelter, B. Loock
Oct 1, 1978
Citations
0
Influential Citations
12
Citations
Journal
Canadian Journal of Chemistry
Abstract
15N-Etioporphyrin I was prepared by polycondensation of 5-hydroxymethylpyrrole-2-carboxylic acid, obtained via the Bullock route. This method gives an isomerically pure porphyrin with a high yield. The labelled compound was analyzed by nmr of the free base, of the dicationic form, and of the zinc complex. The spectrum of the free base shows a rapid tautomerism of the NH protons at 34 °C which disappears at low temperature. All spectra reveal several long-range proton—nitrogen-15 interactions. The electron spin resonance spectrum of the paramagnetic complex of this porphyrin with copper-63 is readily analyzed. This analysis was extended to the spectra of the complexes obtained with natural copper and with nitrogen-14 porphyrins.