NMR spectra of porphyrins. Part 31. Ring currents in hydroporphyrins
β Scribed by Abraham, Raymond J.; Medforth, Craig J.; Smith, Kevin M.; Goff, Dane A.; Simpson, Daniel J.
- Book ID
- 125902568
- Publisher
- American Chemical Society
- Year
- 1987
- Tongue
- English
- Weight
- 778 KB
- Volume
- 109
- Category
- Article
- ISSN
- 0002-7863
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π SIMILAR VOLUMES
## Abstract The proton NMR spectra of tetraphenylporphyrin, octaethylporphyrin and the analogous chlorins (7,8βdihydroporphyrins) 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 change in ring current of octaethylporphyrin, meso-tetraphenylporphyrin and phthalocyanine cobalt(II1) complexes with axial amine ligands was studied using a double dipole network model. The porphyrin ring current was found to be highest in octaethylporphyrin but decreased by 5% in meso-tetraphe
## Abstract A model of the paramagnetism in cobalt(II) porphyrin complexes has been developed which successfully calculates paramagnetic shifts for protons not affected by the contact term. The model utilizes a single large dipole positioned on the cobalt(II) atom, and calculates the pseudoβcontact