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THE EFFECT OF COORDINATING LIGANDS ON THE TRIPLET STATE OF CHLOROPHYLL
Author(s) -
Clarke R. H.,
Hotchandani S.,
Jagannathan S. P.,
Leblanc R. M.
Publication year - 1982
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1982.tb04418.x
Subject(s) - chlorophyll , triplet state , chemistry , chlorophyll a , photochemistry , light harvesting complexes of green plants , monomer , fluorescence , ligand (biochemistry) , chlorophyll fluorescence , molecule , photosynthesis , photosystem ii , physics , biochemistry , photosystem i , organic chemistry , receptor , quantum mechanics , polymer
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.