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Descriptive Chemistry Of Self-Assembled Multilayer Second-Order NLO Materials. Chemical, Microstructural and Performance Interrelationships

  • Shlomo Yitzchaik (a1), Ashok K. Kakkar (a1), Stephen B. Roscoe (a1), Tobin J. Marks (a1), Paul M. Lundquist (a2), Weiping Lin (a2) and George K. Wong (a1) (a2)...

Abstract

The construction of covalently self-assembled second-order nonlinear optical (NLO) Materials containing stilbazole or alkynyl-type high-β chromophores acentrically organized on inorganic oxide substrates is discussed. These structurally different chromophores exhibit differing packing densities on the surface when introduced under the same reaction conditions. In the stilbazolium chromophores, ion-exchange of the chloride counter-anion with very large anionie organic dyes results in appreciably enhanced second harmonic generation (SHG) efficiency. The frequency-dependent SHG response for self-assembled Monolayers derived from the alkynyl-type chromophore was also investigated. The linear absorption spectra exhibit two maxima in the visible region which are assigned to electronically isolated chromophores (480 nm) and aggregated species (540 nm). The dispersion of the second-order NLO coefficient reveals that both microstructures are NLO-active. The origin of the SHG response from both assemblies is discussed.

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1. (a) Yitzchaik, S., Roscoe, S.B., Kakkar, A.K., Allan, D.S., Marks, T.J., Xu, Z., Zhang, T., Lin, W. and Wong, G.K., J. Phys. Chem. 97, 6958 (1993).
(b) Kakkar, A.K., Yitzchaik, S., Roscoe, S.B., Kubota, F., Allan, D.S., Marks, T.J., Lin, W. and Wong, G.K. Langmuir, 9, 388 (1993).
(c) Li, D., Ratner, M.A., Marks, T.J., Zhang, C., Yang, J. and Wong, G.K., J. Am. Chem. Soc., 112, 7389 (1990).
(d) Roscoe, S.B., Yitzchaik, S., Kakkar, A.K., Marks, T.J., Lin, W. and Wong, G.K., submitted.
(e) Lundquist, P., Yitzchaik, S., Zhang, T., Kanis, D.R., Ratner, M.A., Marks, T.J. and Wong, G.K., submitted.
2. (a) Marder, S.R., Sohn, J.E. and Stucky, G.D. (Eds.) Materials for Nonlinear Optics: Chemical Perspectives, ACS Symposium Series 455, American Chemical Society, Washington, DC (1991)
(b) Prasad, P.N. and Williams, D.J., Introduction to Nonlinear Optical Effects in molecules and Polymers Wiley, New York (1991).
3. Ashwell, G.J., Hargreaves, R.C., Baldwin, C.E., Bahra, G.S., Brown, C.R., Nature 357, 393 (1992).
4. (a) Maoz, R., Sagiv, J., J. Colloid Interface Sci., 100 (2), 465 (1984).
(b) Ulman, A., An Introduction to Ultrathin Organic Films, Academic Press, New York, (1991), and references therein.
5. The synthesis of the chromophore precursor 2 will be reported elsewhere.
6. Zhang, T.G., Zhang, C.H and Wong, G.K. J. Opt. Soc. Am. B, 7, 902 (1990).
7. These calculations were carried out by Dr. D.A. Kanis using ZINDO/SOS formalism: Kanis, D.R., Ratner, M.A. and Marks, T.J., Int. J. Quantum Chem., 43, 61 (1992).
8. a) McRae, E.D. and Kasha, M., Physical Processes in Radiation Biology, Academic Press, Inc. New York, N.Y. 23 (1964).
b) Ekhardt, H., Bose, A. and Krongauz, V., Polymer 28, 1959 (1987).

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