THE EFFECT OF COORDINATING LIGANDS ON THE TRIPLET STATE OF CHLOROPHYLL

R. H. Clarke, S. Hotchandani, S. P. Jagannathan, Roger Leblanc

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Under laser excitation at 457.9 and 514.5 nm, a frozen solution of chlorophyll a in n‐octane displays fluorescence peak maxima at 2K that may be assigned to two distinct monomeric chlorophyll species. Using zero‐field fluorescence‐detected magnetic resonance the triplet state properties of the two chlorophyll species have been assigned to the monoligated and biligated chlorophyll monomer in which water serves as the ligand coordinated to the magnesium metal center. These triplet state properties for chlorophyll in solution are then utilized in interpreting triplet state results for in vivo chlorophylls associated with the light harvesting chlorophyll protein complex. It is shown that the triplet state data are consistent with attachment of the chlorophyll molecule to the protein site with a single ligand coordinated to the chlorophyll metal center.

Original languageEnglish (US)
Pages (from-to)575-579
Number of pages5
JournalPhotochemistry and Photobiology
Volume36
Issue number5
DOIs
StatePublished - 1982
Externally publishedYes

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ASJC Scopus subject areas

  • Medicine(all)
  • Biochemistry
  • Physical and Theoretical Chemistry

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