## Abstract The proton NMR spectra of tetraphenylporphyrin, octaethylporphyrin and the analogous chlorins (7,8โdihydroporphyrins) are presented, and the chemical shift changes on chlorin formation are interpreted using a ring current model. In these compounds a general 10% reduction in the ring cur
The NMR spectra of porphyrins-25: Meso-substituent effects in neutral and protonated porphyrins
โ Scribed by Kevin M. Smith; Frank W. Bobe; Ohannes M. Minnetian; Raymond J. Abraham
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- French
- Weight
- 871 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0040-4020
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## Abstract The preparation, isolation and characterization by proton and ^13^C NMR of the four possible atropisomers of __meso__โtetra(2โmethoxyโ1โnaphthyl)porphyrin is described. Chemical shift differences due to atropisomerization effects are observed in the porphyrin and naphthyl rings. Compari
Reproducible proton chemical shifts in the porphyrin series are obtained when the spectrum is measured in chloroform using the zinc (11) complex of the porphyrin in the presence of an excess of pyrrolidine. This method is specifically demonstrated for the case of 2,4-dicyanodeuteroporphyrin-M dimeth
Dipolar splittings with a quadratic dependence on static magnetic field strength are reported for selected pairs of nuclei in several porphyrins. These splittings are detectable as a result of a slight molecular alignment caused by the interaction of the static magnetic field with the anisotropic ma