Regeneration of Light-Harvesting Complexes via Dynamic Replacement of Photodegraded Chromophores

摘要

All-synthetic molecular donor-acceptor complexes are designed, Which: Are capable of counteracting the effect of photoinduced degradation of donor chromophores. Anionic gallium protoporphyrin IX (GaPP) and semiconducting carbon, nanotube (CNT) are used as a model donor-acceptor complex, Which is assembled using: DNA oligonucleotides. The GaPP-DNA-CNT complex produces an anodic photo current in a photoelectrochemical cell, Which steadily decays due to photo-oxidation. By modulating the chemical environment, We showed that the photodegraded chromophores May be dissociated:from the complex, whereas the DNA-coated carbon nanotube acceptors are kept intact, Reassociation with fresh porphyrins leads to the full recovery of GaPP absorption and photocurrents. This strategy could form a basis for improving the light-harvesting performance of molecular donor-acceptor complexes and extending their operation lifetime.