Photoredox properties of zinc porphyrin–viologen complexes

摘要: Ground-state complexation occurs between zinc porphyrins and viologens in aqueous solution, cases where there is strong electrostatic attraction the reactants stability constants are high. This ensures that static effects far outweigh dynamic fluorescence quenching experiments, but direct excitation of complexes does not result formation redox-ion products.Both singlet triplet excited states porphyrin quenched when viologen covalently linked to chromophore by a short, flexible chain. The efficiencies depend upon chain length solvent. In alcohol solvents, products observed flash-photolysis techniques no real evidence show state capable charge separation under such conditions.