title: Ultrafast energy transfer in biomimetic multistrand nanorings.
abstract: We report the synthesis of LH2-like supramolecular double- and triple-stranded complexes based upon porphyrin nanorings. Energy transfer from the antenna dimers to the π-conjugated nanoring occurs on a subpicosecond time scale, rivaling transfer rates in natural light-harvesting systems. The presence of a second nanoring acceptor doubles the transfer rate, providing strong evidence for multidirectional energy funneling. The behavior of these systems is particularly intriguing because the local nature of the interaction may allow energy transfer into states that are, for cyclic nanorings, symmetry-forbidden in the far field. These complexes are versatile synthetic models for natural light-harvesting systems.
authors.affiliation: Department of Physics, University of Oxford , Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: Patrick
authors.initials: P
authors.lastname: Parkinson
authors.forename: Christiane E I
authors.initials: CE
authors.lastname: Knappke
authors.forename: Nuntaporn
authors.initials: N
authors.lastname: Kamonsutthipaijit
authors.forename: Kanokkorn
authors.initials: K
authors.lastname: Sirithip
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Matichak
authors.forename: Harry L
authors.initials: HL
authors.lastname: Anderson
authors.forename: Laura M
authors.initials: LM
authors.lastname: Herz
mesh_terms: D040761:Biomimetic Materials / Q000138:chemical synthesis* / Q000737:chemistry; D004735:Energy Transfer; D008958:Models, Molecular; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D013997:Time Factors
chemical_list: D011166:Porphyrins