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Solution structure of porphyrin aggregates determined by 1H NMR ring current shifts. I. Heterodimers of oppositely charged porphyrins

✍ Scribed by U. Hofstra; R. B. M. Koehorst; T. J. Schaafsma

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 454 KB
Volume: 25
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260251210

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✦ Synopsis

The solution structures of dimers consisting of negatively charged Zn[tetra(4-carboxyphenyl)porphyrin], ZnTPPC, with positively charged Zn[tetra(4-N-methylpyridyl)porphyrin], ZnTMPyP, and with H2[tetra(4-N-methylpyridyl)porphyrin], H,TMPyP, were determined by 'H NMR ring current shifts. The conformation is not affected by the presence of the metal in the centre of the TMPyP monomer. The dimers have a cofacial conformation with a plane-to-plane separation of 3.1 A and an in-plane translation of 4.2 A along the aryl-aryl axis. KEY WORDS Ring current shifts Heterodimers of oppositely charged porphyrins Solution structure 'H NMR

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Solution structure of porphyrin aggregat

Solution structure of porphyrin aggregates determined by 1H NMR ring current shifts. II. Conformations of dimers and higher aggregates of water-soluble porphyrins

✍ R. B. M. Koehorst; U. Hofstra; T. J. Schaafsma 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 558 KB

The aggregation of the water-soluble porphyrins tetra(4-carboxypheny1)porphyrin free base (H,TPPC), tetra(4-N-methylpyridy1)porphyrin free base (H,TMPyP) and their zinc derivatives (ZnTPPC and ZnTMPyP) was studied by 'H NMR and optical absorption spectroscopy. In the solvent H,O-CH,OH (4:1), mixing