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FLUORESCENCE SPECTRA AND ZERO‐FIELD MAGNETIC RESONANCE OF CHLOROPHYLL a ‐WATER COMPLEXES
Author(s) -
Kooyman R. P. H.,
Schaafsma Tjeerd J.,
Kleibeuker Joop F.
Publication year - 1977
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.1751-1097.1977.tb07479.x
Subject(s) - chemistry , fluorescence , chlorophyll a , chlorophyll , water dimer , spectral line , zero field splitting , polar , dimer , spectroscopy , resonance (particle physics) , photochemistry , nuclear magnetic resonance , analytical chemistry (journal) , hydrogen bond , atomic physics , electron , molecule , physics , optics , environmental chemistry , spin polarization , biochemistry , organic chemistry , quantum mechanics , astronomy
. –Fluorescence detected magnetic resonance (FDMR) and fluorimetry have been used to study chlorophyll‐water complexes at T = 4.2 K. By combining these methods, zero‐field splitting (ZFS)‐parameters can be assigned to the triplet state of the various species. It is found that these parameters decrease upon aggregation and/or complexation. These results can be rationalized by using a simple free‐electron model for chlorophyll including excitonic interaction. Evidence is presented favouring a structure recently proposed by Shipman and Katz for a chlorophyll‐dimer involving hydrogen‐bonded water, present in non‐polar solutions at low temperature with spectral properties similar to those of chlorophyll in vivo.