Chemical models for aspects of the photosynthetic reaction centre: synthesis and photophysical properties of tris- and tetrakis-porphyrins that resemble the arrangement of chromophores in the natural system

2005 ◽  
Vol 3 (5) ◽  
pp. 852 ◽  
Author(s):  
Maxwell J. Crossley ◽  
Paul J. Sintic ◽  
James A. Hutchison ◽  
Kenneth P. Ghiggino
Keyword(s):  
Photophysical Properties ◽  
Natural System ◽  
Reaction Centre ◽  
Chemical Models ◽  
Photosynthetic Reaction Centre

scholarly journals Synthetically tuneable biomimetic artificial photosynthetic reaction centres that closely resemble the natural system in purple bacteria

2016 ◽  
Vol 7 (10) ◽  
pp. 6534-6550 ◽  
Author(s):  
Sai-Ho Lee ◽  
Iain M. Blake ◽  
Allan G. Larsen ◽  
James A. McDonald ◽  
Kei Ohkubo ◽  
...  
Keyword(s):  
Purple Bacteria ◽  
Natural System ◽  
Reaction Centre ◽  
Reaction Centres ◽  
Photochemical Properties ◽  
Artificial Photosynthetic ◽  
Photosynthetic Reaction Centre

Synthetically flexible, rigid, tetrad molecules are shown to closely mimic structural and photochemical properties of the bacterial photosynthetic reaction centre.

Photophysical properties of quinones and their interaction with the photosynthetic reaction centre

2008 ◽  
Vol 7 (8) ◽  
pp. 973 ◽  
Author(s):  
Arianna Barbafina ◽  
Fausto Elisei ◽  
Loredana Latterini ◽  
Francesco Milano ◽  
Angela Agostiano ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Reaction Centre ◽  
Photosynthetic Reaction Centre

Chemometric Analysis of Substituent Effects. VIII. Alternative Interpretation of Substituent Effects (AISE)

1995 ◽  
Vol 60 (9) ◽  
pp. 1502-1528 ◽  
Author(s):  
Oldřich Pytela
Keyword(s):  
Multiple Bond ◽  
Substituent Effects ◽  
Alternative Interpretation ◽  
Class I ◽  
Reaction Centre ◽  
Correlation Equations ◽  
Class Iii ◽  
Substituent Constant ◽  
Chemical Models ◽  
The Individual

Alternative interpretation of substituent effects (AISE) starts from the presumption that a substituent only possesses a single property described by a single substituent constant. This property is transmitted to the reaction centre by three different ways depending on the interaction type in the triad reaction centre - basic skeleton - substituent. For interpretation it is substantial whether or not the substituent has p electrons at the atom adjacent to the basic skeleton. If it has none, the substituent belongs to class I and operates only by its basic effect described by the mentioned single substituent constant. Substituents of class II possess a free electron pair at the atom adjacent to the basic skeleton, and those of class III have a multiple bond between the first and the second atoms which is polarized in the direction from the basic skeleton. Substituent effects in class I are described by a substituent constant identical with σI constant. Substituents in classes II and III show additional effects proportional to the same constant. Hence, a separate treatment of substituent effects in the individual classes provides three straight lines intersecting in a common point. Mathematically, the description of substituent effects in this approach is expressed by a family of lines with a single explaining variable. The point of intersection, which is referred to as the iso-effect point, is not identical with the classic standard substituent - hydrogen - but is near to CN substituent. The approach given has the advantage of adopting a single substituent constant whose scale can be adjusted relatively precisely. Its drawback (like in the case of the correlation equations derived from the principle of separation of substituent effects) lies in a more extensive set of substituents needed for a correlation. The AISE principle has been applied to 318 series of experimental data describing effects of 32 substituents in a large variety of chemical models (aliphatic, alicyclic, aromatic, heteroaromatic, with or without direct conjugation between reaction centre and substituent) in both chemical reactions and equilibria. A comparison with two other correlation relations with two and three substituent constants for interpretation of substituent effects based on the principle of separation of the individual substituent effects showed that the closeness of AISE based correlations is comparable with that of the correlation equations currently used. It was somewhat less successful in the models with direct conjugation between reaction centre and substituent but the AISE principle can be used even in these cases.

Surface anchored self-assembled reaction centre mimics as photoanodes consisting of a secondary electron donor, aluminium(iii) porphyrin and TiO2 semiconductor

2019 ◽  
Vol 21 (35) ◽  
pp. 19612-19622 ◽  
Author(s):  
Niloofar Zarrabi ◽  
Gary N. Lim ◽  
Brandon J. Bayard ◽  
Francis D'Souza ◽  
Prashanth K. Poddutoori
Keyword(s):  
Electron Donor ◽  
Secondary Electron ◽  
Photophysical Properties ◽  
Reaction Centre ◽  
Self Assembled

Vertically assembled photoanodes, consisting of aluminum(iii) porphyrin, an electron donor, and semiconductor TiO2, have been fabricated and their photophysical properties investigated.

Intramolecular photoinduced processes of newly synthesized dual zinc porphyrin-fullerene triad with flexible linkers

2006 ◽  
Vol 10 (12) ◽  
pp. 1380-1391 ◽  
Author(s):  
Mohamed E. El-Khouly ◽  
Jun Hasegawa ◽  
Atsuya Momotake ◽  
Mikio Sasaki ◽  
Yasuyuki Araki ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Photophysical Properties ◽  
Ion Pair ◽  
Reaction Centre ◽  
Polar Solvents ◽  
Time Resolved ◽  
Zinc Porphyrin ◽  
Photosynthetic Antenna ◽  
Porphyrin Moiety ◽  
Photoinduced Processes

Zinc porphyrin-fullerene-zinc porphyrin triad, in which two zinc porphyrin ( ZnP ) moieties and a fullerene ( C 60) moiety are linked by flexible bonds and which is intended to be a working model of the photosynthetic antenna-reaction centre, has been newly synthesized. Its photophysical properties have been investigated by both time-resolved emission and transient absorption techniques. Excitation of the zinc porphyrin moiety of the triad induced charge separation, generating the radical ion pair, in which the electron localizes on the C 60 moiety and the hole localizes on the zinc porphyrin moiety. In polar solvents, the charge-separated states decayed with lifetimes of 300-600 ns returning to the ground state. Compared with ZnP - C 60 dyad, ZnP - C 60- ZnP triad showed longer lifetimes for the radical ion pair due to the conformation of the two ZnP moieties. The effects of the coordinating reagents on the zinc atom have been studied, with the expectation of conformational change of the two ZnP moieties with respect to C 60.

First moves towards photoautotrophic synthetic cells: In vitro study of photosynthetic reaction centre and cytochrome bc 1 complex interactions

2017 ◽  
Vol 229 ◽  
pp. 46-56 ◽  
Author(s):  
Emiliano Altamura ◽  
Rosa Fiorentino ◽  
Francesco Milano ◽  
Massimo Trotta ◽  
Gerardo Palazzo ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Reaction Centre ◽  
Cytochrome Bc ◽  
Complex Interactions ◽  
Synthetic Cells ◽  
Photosynthetic Reaction Centre
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