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Oxochlorin frameworks confining a β-hydroxyketone moiety.

Nivedita Chaudhri1,2, Matthew J Guberman-Pfeffer3, Matthias Zeller4

  • 1Department of Chemistry, University of Connecticut, Storrs, CT 06269-3060, USA. c.bruckner@uconn.edu.

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Meso-hydroxyoxochlorins feature an acetylacetonate-like moiety but do not chelate transition metals due to aromaticity concerns. Halochromic properties reveal protonation sites, supported by computational analysis.

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Area of Science:

  • Organic Chemistry
  • Coordination Chemistry
  • Photochemistry

Background:

  • Meso-hydroxyoxochlorins possess acetylacetonate (acac)-like moieties within their chromophore structures.
  • These moieties exhibit enol forms and strong intramolecular hydrogen bonding between enol and beta-ketone groups.

Purpose of the Study:

  • To investigate the metal-chelating capabilities of the acac-like functionality in meso-hydroxyoxochlorins.
  • To understand the electronic properties and protonation/deprotonation sites within these molecules.

Main Methods:

  • X-ray diffraction studies to analyze crystal structures and hydrogen bonding.
  • Testing the chelation of 3d and 4d transition metal ions.
  • Halochromism studies to probe protonation sites.
  • Computational analysis to support experimental findings.

Main Results:

  • Meso-hydroxyoxochlorins, despite having acac-like structures, do not effectively chelate transition metal ions.
  • Chelation is hindered by the perturbation of porphyrinic chromophore aromaticity, outweighing metal binding energies.
  • Halochromic properties indicate specific protonation/deprotonation sites within the molecules.

Conclusions:

  • The unique structure of meso-hydroxyoxochlorins prevents metal chelation due to aromaticity preservation.
  • Protonation/deprotonation behavior is linked to the chromophore's electronic structure and stability.