Long Range Coherent Energy Transfer in Artificial Multichromophoric Antenna Systems—A Case of Breaking Kasha's Rule
Abstract
Abstract Ultrafast long‐range energy transfer with unitary quantum‐yield has been studied in a novel family of artificial DNA‐guided multichromophoric antenna complexes with phenanthrene moieties as light harvesters. By means of femtosecond transient absorption spectroscopy and time‐dependent density function theory calculations, we demonstrate that the highly efficient long‐range energy transfer occurs via a coherent mechanism. It is enabled by photoexcitation of higher lying delocalized excited states of phenanthrene, and hence, can be labelled anti‐Kasha in nature. Moreover, we show the important contribution of exciplex formation between acceptor and closest donor.
Article Details
Authors (14)
Maryam Nazari Haghighi Pashaki
Institute of Applied Physics University of Bern Sidlerstrasse 5 Bern CH‐3012 Switzerland
Caroline D. Bösch
Department of Chemistry, Biochemistry and Pharmaceutical Sciences University of Bern Freiestrasse 3 Bern CH‐3012 Switzerland
Florian Garo
Department of Chemistry, Biochemistry and Pharmaceutical Sciences University of Bern Freiestrasse 3 Bern CH‐3012 Switzerland
Ambre Blanc
Université de Lorraine & CNRS LPCT UMR 7019 F‐5400 Nancy, Metz France
Marco Marazzi
Departamento de Química Analítica Química Física e Ingeniería Química, Functional Molecular Systems (FuMSys) group, Universidad de Alcalá Ctra. Madrid‐Barcelona Km. 33 Alcalá de Henares (Madrid) 600 E‐28805 Spain
Ariana Rondi
Institute of Applied Physics University of Bern Sidlerstrasse 5 Bern CH‐3012 Switzerland
Michela Gazzetto
Institute of Applied Physics
Maryam Akbarimoosavi
Institute of Applied Physics University of Bern Sidlerstrasse 5 Bern CH‐3012 Switzerland
jean‐christophe Tremblay
Université de Lorraine & CNRS LPCT UMR 7019 F‐5400 Nancy, Metz France
Simon Matthias Langenegger
Department of Chemistry, Biochemistry and Pharmaceutical Sciences University of Bern Freiestrasse 3 Bern CH‐3012 Switzerland
Antonio Monari
ITODYS
Robert Häner
Department of Chemistry, Biochemistry and Pharmaceutical Sciences University of Bern Freiestrasse 3 Bern CH‐3012 Switzerland
Thomas Feurer
Andrea Cannizzo