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A Complex Comprising a Cyanine Dye Rotaxane and a Porphyrin Nanoring as a Model Light‐Harvesting System
Author(s) -
Pruchyathamkorn Jiratheep,
Kendrick William J.,
Frawley Andrew T.,
Mattioni Andrea,
CaycedoSoler Felipe,
Huelga Susana F.,
Plenio Martin B.,
Anderson Harry L.
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202006644
Subject(s) - nanoring , cyanine , photochemistry , porphyrin , rotaxane , supramolecular chemistry , chemistry , fluorescence , materials science , nanotechnology , molecule , optics , organic chemistry , physics
A nanoring‐rotaxane supramolecular assembly with a Cy7 cyanine dye (hexamethylindotricarbocyanine) threaded along the axis of the nanoring was synthesized as a model for the energy transfer between the light‐harvesting complex LH1 and the reaction center in purple bacteria photosynthesis. The complex displays efficient energy transfer from the central cyanine dye to the surrounding zinc porphyrin nanoring. We present a theoretical model that reproduces the absorption spectrum of the nanoring and quantifies the excitonic coupling between the nanoring and the central dye, thereby explaining the efficient energy transfer and demonstrating similarity with structurally related natural light‐harvesting systems.