Abstract
The synthesis of a cyclic hexaporphyrin array with an intergral acceptor chromophore, mimicking the light-harvesting complex of photosynthetic purple bacteria, is described. The cavity of this hexagonal macrocycle, which is circumscribed by five porphyrin rings, as Zn(II) chelates, and one porphyrin ring, as free base, has a diameter of about 4.6 nm. The quantum efficiency of intramolecular transfer of singlet excited-state energy determined by comparison with a solution of a mixture of the corresponding porphyrin monomers in a 5:1 ratio amounts to 40 %.
The synthesis and the quantum efficiency of the intramolecular transfer of singlet excited-state energy of a cyclic hexaporphyrin array with an integral acceptor chromophore, mimicking the light-harvesting complex of photosynthetic purple bacteria, are described. The cavity of this hexagonal macrocycle has a diameter of about 4.6 nm.