Investigation of the Triplet State of Chlorophylls. Technical Progress Report, May 1, 1979-April 30, 1980 Page: 5 of 14
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II. Progress Report (5/1/79 - present)
Our research program over the past support period (5/1/79 - 4/30/80)
has been focussed on three areas, all involving zero-field ODMR spectroscopy in
the triplet state of the chlorophyll pigment. The areas of concentration have
been:
1. Chlorophyll a_ - chlorophyll b_ triplet energy transfer in frozen solution.
2. Makeup of photosystem I (PS1) and light harvesting chlorophyll protein
(LHCP) particles.
3. Triplet state spectra of model chlorophyll-protein systems.
As has been the basic approach of our research program over the past several years,
the structural features, stabilizing interactions and excited state dynamics of
these systems have been investigated through use of a photoexicted triplet state
generated as a nondestructive probe within the systems and the triplet state pro-
perties utilized to interpret their physical makeup. The value of ODMR spectroscopy,
combining high resolution and high sensitivity is particularly apparent when one
considers the molecular complexity of the systems listed above.
Specifically, the experiments to date have resulted in the following
developments:
1. Chlorophyll a_ - chlorophyll b^ triplet energy transfer
Chronologically, the motivation to investigate triplet transfer between
the two commonly occuring photosynthetic pigments originated from the discovery
that such processes appeared to occur in_ vivo with considerable efficiency (yide
infra - LHCP protein). In order to examine the specific nature of the triplet inter-
action between the triplet donor (chi b) and triplet acceptor (chi a) we examined
the system containing both pigments in frozen solutions of highly dried and purified
toluene, made up to concentrations of ^10 ^M in both pigments. Using light excita-
tion tuned selectively to either the chlorophyll a or b Soret absorption band, the
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Clarke, R. H. Investigation of the Triplet State of Chlorophylls. Technical Progress Report, May 1, 1979-April 30, 1980, report, January 1, 1980; Boston, Massachusetts. (https://digital.library.unt.edu/ark:/67531/metadc1086253/m1/5/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.