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Coordination Properties of Magnesium in Chlorophyll from IR and NMR Spectra

  • Joseph J. Katz
Part of the Developments in Applied Spectroscopy book series (DAIS, volume 6)

Abstract

The infrared (IR) and nuclear magnetic resonance (NMR) spectra of chlorophyll are best interpreted on the basis that the central magnesium atom of the chlorophyll always has a coordination number larger than 4. In electron-donor solvents, chlorophyll exists as monomer, with solvent molecules filling the axial position(s). In nonpolar solvents, the coordination unsaturation of the magnesium is relieved by coordination of the ketone oxygen function of one molecule of chlorophyll with the magnesium of another. This leads to dimer or higher aggregate formation in nonpolar media. Chlorophyll-ligand interactions can be studied by observing ring- current shielding effects on the chemical shifts of protons in ligands coordinated to the magnesium atom of chlorophyll. Chlorophyll is shown by this procedure to coordinate ethanol and lutein but not 0 carotene. With plant sulf olipid, chlorophyll probably dissolves in sulf olipid micelles present in CCI4 solution as a result of phytyl long-chain fatty acid interactions rather than as a primary result of coordination interactions involving magnesium. Deuterated chlorophyll is shown to be very useful for these NMR studies.

Keywords

Nuclear Magnetic Resonance Spectrum Nuclear Magnetic Resonance Spectroscopy Nonpolar Solvent Upfield Shift Chlorophyll Molecule 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chicago Section of the Society for Applied Spectroscopy 1968

Authors and Affiliations

  • Joseph J. Katz
    • 1
  1. 1.Argonne National LaboratoryArgonneUSA

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