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The structure of abelsonite.

C B Storm, J Krane, T Skjetne

    Science (New York, N.Y.)
    |March 9, 1984
    PubMed
    Summary
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    Abelsonite, a nickel-porphyrin, has a confirmed C31 deoxophylloerythroetioporphyrin structure with specific methyl and ethyl group placements. Geochemical analysis suggests its origin from chlorophyll.

    Area of Science:

    • Geochemistry
    • Organic Chemistry
    • Paleontology

    Background:

    • Abelsonite is a C31 nickel-porphyrin found in geological samples.
    • Its precise molecular structure and origin have been subjects of scientific inquiry.

    Purpose of the Study:

    • To elucidate the detailed molecular structure of abelsonite.
    • To investigate the geochemical origins of abelsonite.

    Main Methods:

    • High-resolution, high-field proton nuclear magnetic resonance (1H NMR) spectroscopy.
    • Nuclear Overhauser Effect (NOE) studies.
    • Demetallation using methanesulfonic acid.

    Main Results:

    • The C31 nickel-porphyrin structure of abelsonite was confirmed.

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  • Methyl groups were identified at positions 2, 3, 7, 12, and 18.
  • Ethyl groups were identified at positions 8 and 17.
  • The free base porphyrin retained structural integrity after nickel removal.

    • Conclusions:

    • The detailed structure of abelsonite has been definitively determined.
    • The structural findings support the hypothesis that abelsonite is geochemically derived from chlorophyll.