Energy and charge transfer dynamics in DNA based light harvesting antennae

Akbarimoosavi, Maryam; Bösch, Caroline; Nazari Haghighi Pashaki, Maryam; Rohwer, Egmont Johann; Rondi, Ariana; Cannizzo, Andrea; Feurer, Thomas; Häner, Robert (14 January 2015). Energy and charge transfer dynamics in DNA based light harvesting antennae (Unpublished). In: MUST Annual Meeting 2015. Engelberg. 12.01.-14.01.2015.

DNA can serve as a versatile scaffold for chromophore assemblies. For example, light-harvesting
antennae have been realized by incorporating phenanthrene and pyrene building blocks into DNA
strands. It was shown that by exciting at 320 nm (absorption of phenanthrene), an emission at
450 nm is observed which corresponds to a phenanthrene-pyrene exciplex. The more
phenanthrenes are added into the DNA duplex, the higher is the fluorescence intensity with no
significant change in quantum yield. This shows that phenanthrene acts as a donor and efficiently
transfers the excitation energy to the pyrene. Up to now, the mechanism of this energy transfer
and exciplex formation is not known. Therefore, we first aim at studying the photo-cycle of such
DNA assemblies through transient absorption spectroscopy. Based on the results, we will explore
ways to manipulate the energy transfer by application of intense THz fields. Ground as well as
excited state Stark effect dynamics will be investigated.

Item Type:

Conference or Workshop Item (Poster)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)
08 Faculty of Science > Institute of Applied Physics

UniBE Contributor:

Akbarimoosavi, Maryam; Bösch, Caroline; Nazari Haghighi Pashaki, Maryam; Rohwer, Egmont Johann; Rondi, Ariana; Cannizzo, Andrea; Feurer, Thomas and Häner, Robert

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry
600 Technology > 620 Engineering

Language:

English

Submitter:

Franziska Bornhauser-Rufer

Date Deposited:

27 Feb 2015 16:15

Last Modified:

27 Feb 2015 16:15

URI:

https://boris.unibe.ch/id/eprint/63860

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