- Conference date: 24–28 February 2008
- Location: Thiruvananthapuram, Kerala (India)
Conjugated organic molecules with large optical non‐linearities have become the focus of current research in view of their potential applications, in various photonic technologies. Dipolar push‐pull Organic chromophores that exhibit extended π‐conjugation, in particular, show enhanced second order NLO properties. Among them, NLO‐phores constituted by stilbene derivatives bearing electron‐donor and electron‐acceptor groups at the end position of the π‐conjugated system have been subject of great research efforts. The second order NLO properties seem to be related with the existence of a large intramolecular charge transfer at relatively low energy values. The study of the vibrational spectra is an effective tool to get information about the structure—NLO property correlations of the push‐pull molecules. This work deals with the electron‐phonon coupling and intramolecular charge transfer that considerably contributes to the linear electro‐optic effect of the high efficiency push‐pull NLO chromophores 4‐[N, N‐Dimethylamino]‐4’‐N’‐Methyl Stilbazolium Tosylate (DAST) and 4‐[N, N‐Dimethylamino]‐4’‐Nitro Stilbene (DANS) from their vibrational spectra.
- Charge transfer
- Molecular spectra
- Energy transfer
- Rotational correlation time
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