Charge-Transfer State as a possible signature of a ZeaxanthinuChlorophyll dimer in the non-photochemical quenching
Article Abstract:
Quantum chemical calculations are used to study the charge-transfer (CT) state where an electron is transferred from the carotenoid to the chlorophyll, becomes lower in energy than the Q(sub y) and the S(sub 1) states of chlorophyll and zeaxanthin, when s a zea-dimer is formed. Results strongly points on absorption of the zeaxanthin radical cation present in the CT state can be experimentally used as signature of the zea-chl dimer during the NPQ process.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2003
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Ultrafast photoinitiated long-range electron transfer in cyclophane-bridged zincporphyrin-quinone complexes via conical intersections
Article Abstract:
The molecular mechanism of the ultrafast photoinitiated long-range electron transfer in cyclophane-bridged zincporphyrin-quinone complexes is investigated with the help of modern quantum chemical methods. Two-excited-state crossings between the initially excited Q states and an appropriate zincporphyrin-to-quinone charge-transfer state could be identified, which are located in the vicinity of the ground-state equilibrium geometry.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2004
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Initial steps of the photodissociation of the CO ligated heme group
Article Abstract:
Irradiation of CO ligated hemoglobin or myoglobin with a laser pulse of 570 nm, the proteins are electronically excited into the Q states and undergo dissociation of the CO ligand within 50 fs. The conclusion states that at a separation distance of 2.5 A, the state has charge-transfer character from the iron to the nitrogens of the porphyrin ring as well as the CO and imidazole ligand.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2003
User Contributions:
Comment about this article or add new information about this topic:
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