IN-VITRO SIMULATION OF SEQUENTIAL ELECTRON TRANSFER PROCESSES IN PHOTOSYNTHETIC REACTION CENTERS
This project aims at understanding and constructing organic solid state devices exhibiting fast photoinduced charge separation and slow charge recombination. For binary donor - acceptor systems of porphyrin benzoquinone type, charge separation and recombination are both fast. We have chosen porphyrins linked to nitroaromatics with different relative orientation to study the effects of donor - acceptor distance and their orientation on the primary processes in these systems immediately following optical excitation, and to determine design criteria for more complicated systems, containing two or more acceptors. The results are compared to those for linked and separated porphyrin - quinone systems. By a variety of techniques, by magnetic resonance at zero and high magnetic field, and by magnetic field modulation of the triplet yield, it has been established, that the vicinity of a nitroaromatic acceptor group greatly enhances the formation and decay of donor triplets via normal intersystem crossing. The enhancement depends on the distance of closest approach between donor and acceptor, as well as on the polarity of the solvent. Part of the program has been devoted to the construction of covalently bound electron donor - acceptor compounds with more than one acceptor.
Bibliographic Reference: EUR 9319 EN (1984) MF, 83 P., BFR 120, BLOW-UP COPY BFR 415, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123103200 / Last updated on: 1987-01-01
Available languages: en