Objective
The proposed research is directed to the creation of artificial systems enabled to transform light energy into the energy of separated charges and development of the microscopic models of this process. In particular the experiments will be carried out to determine whether porphyrin and chlorine molles or covalent bound dyads of the pointed molles bearing opposite charged stituents might form self-assembling com- plexes in water solutions and perform efficient photoinduced electron transfer. These studies will be applied for the synthesis of charged porphyrins and chlorines and dyad containing quinone molle. There are two strategic lines.
One of them is to create dyad with negatively charged stituents on the electron donor molle and positively charged acceptor molle. It should facilitate forward electron transfer. The dyad with opposite direction of electric field of stituents will be prepared to test the impact of opposite position of the charges for the rate constant of forward and back photoinduced electron transfer.
The second approach is to make the dyad and might be triad with small distance between donor and acceptor (1 nm) which enables to perform effective photoelectron transfer through the triplet state avoiding fast electron transfer from singlet state of a donor. To get the aim a dyad having Pd atom into the porphyrin ring of the donor molle will be prepared for an increase of the rate constant of intersystem crossing S1-T1 and processes of photoinduced electron transfer from triplet state will be studied. New approach will be applied using electron energy transfer from triplet states of the prepared donor to triplet state of porphyrin-quinone dyad to initiate direct PET from the triplet state. The measurements of redox potentials will be made and laser flash photolysis technics will be applied to follow for fast electron transfer processes in wide range of time scale from pico to microsecond. Overall, this project will provide the information for impact of charges on the donor and acceptor and spin orbital interaction (Pd atom) for the regulation of electron transfer processes and possible advantages of triplet photochemistry for driving photoinduced electron transfer.
Topic(s)
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8010 Graz
Austria