High‐field orientation effects in the high‐resolution proton NMR spectra of diverse porphyrins

A. A. Bothner‐By, C. Gayathri, Peter C Van Zijl, C. MacLean, Jan‐Ji ‐J Lai, Kevin M. Smith

Research output: Contribution to journalArticle

Abstract

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 magnetic susceptibilities of the porphyrin rings. The magnitude of the splitting yields an effective value for ΔX, the anisotropy of the susceptibility. This value includes association effects which may be estimated therefrom. Dipolar splittings between protons of attached vinyl groups can also be measured, and provide information about the average dihedral angle between the planes of the vinyl group and porphyrin ring.

Original languageEnglish (US)
Pages (from-to)935-938
Number of pages4
JournalMagnetic Resonance in Chemistry
Volume23
Issue number11
DOIs
StatePublished - 1985
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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