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Journal Article

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

MPS-Authors
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Thekku Veedu,  S.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society;

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Raiser,  D.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society;

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Kia,  R.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society;

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Scholz,  M.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society;

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Techert,  S.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society;

External Ressource
Fulltext (public)

2021329.pdf
(Publisher version), 3MB

Supplementary Material (public)

2021329_Suppl.pdf
(Supplementary material), 65KB

Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-1296-5
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.