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  Ultrafast dynamical study of pyrene-N,N-dimethylaniline (PyDMA) as an organic molecular diode in solid state.

Thekku Veedu, S., Raiser, D., Kia, R., Scholz, M., & Techert, S. (2014). Ultrafast dynamical study of pyrene-N,N-dimethylaniline (PyDMA) as an organic molecular diode in solid state. Journal of Physical Chemistry B, 118(12), 3291-3297. doi:10.1021/jp4121222.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-1296-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-5EF6-4
Genre: Journal Article

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http://pubs.acs.org/doi/pdf/10.1021/jp4121222 (Publisher version)
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Thekku Veedu, S.1, Author              
Raiser, D.1, Author              
Kia, R.1, Author              
Scholz, M.1, Author              
Techert, S.1, Author              
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1Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society, ou_578564              

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 Abstract: Femtosecond optical pump probe spectroscopy has been employed for studying the directly linked electron donor acceptor system pyrene-N,N-dimethylaniline (PyDMA) in solid state. This DMA-pyrene derivative discussed is being applied as a molecular diode system switching on an ultrafast time scale. Our ultrafast solid-state studies reveal a complex photochemistry of this molecular crystal system. Strong couplings of the optically induced charge-transfer state with the radical ion pair state allow a femtosecond transition of the latter. One could see on the highest occupied molecular orbital lowest unoccupied molecular orbital (HOMO-LUMO) description that a pure optical transition switches the system from a conducting to a blocked system because the molecular orbitals (MOs) of DMA moiety lie in a node plane of the LUMO. Within 800 fs the system relaxes back to the ground state and/or forms a radical ion pair, which is the surprising result of our study; when the system was probed further, the system underwent vibrational cooling and enhanced population inversion of the radical ion pair.

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Language(s): eng - English
 Dates: 2014-03-062014-03-27
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/jp4121222
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Title: Journal of Physical Chemistry B
Source Genre: Journal
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Pages: - Volume / Issue: 118 (12) Sequence Number: - Start / End Page: 3291 - 3297 Identifier: -