Krishnan, A and Pal, SK and Nandakumar, P and Samuelson, AG and Das, PK (2001) Ferrocenyl donor-organic acceptor complexes for second order nonlinear optics. In: Chemical Physics, 265 (3). pp. 313-322.
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First hyperpolarizability (beta) of a set of donor-acceptor complexes derived by functionalizing two organic accepters with a donor such as ferrocene or an aromatic ring through a -C=N- linkage has been measured by hyper-Rayleigh scattering in solution. Spectral analysis of the second harmonic scattered light reveals that there is a significant two-photon fluorescence (TPF) contribution to the total signal in some compounds. In fact, the TPF contribution was as high as similar to 25% in two compounds. The measured beta values after correcting for TPF indicate that these molecules possess high second order nonlinearity, much larger than similar organic compounds or charge transfer complexes formed by ferrocenyl donors and organic accepters. The dispersion free beta values of these complexes have been calculated using two different methods depending on the nature of the complex. The conventional nonresonant two-state model which gives a good estimate of the intrinsic second order polarizability away from resonance, has been applied to compounds with no absorption around the second harmonic wavelength. Another model in which a damping parameter related to the inhomogeneous line width of the absorption band near the second harmonic frequency is used for obtaining reliable values of beta (0). has been employed for the other compounds. In conjugation with anthraquinone as acceptor, ferrocene as a donor appears to be a better choice for quadratic nonlinear optics applications than conventional organic donors.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Keywords:||Hyper-Rayleigh Scattering;First Hyperpolarizabilities-Beta;Multiphoton Fluorescence;2-Photon Fluorescence;Molecules;Chromophores.|
|Department/Centre:||Division of Chemical Sciences > Inorganic & Physical Chemistry|
|Date Deposited:||21 Jul 2009 09:57|
|Last Modified:||19 Sep 2010 04:54|
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