Calix[4]arenes as molecules for second order nonlinear optics


Kelderman, Erik and Derhaeg, Lode and Verboom, Willem and Engbersen, Johan F.J. and Harkema, Sybolt and Persoons, A. and Reinhoudt, David N. (1993) Calix[4]arenes as molecules for second order nonlinear optics. Supramolecular Chemistry, 1993 (2-3). pp. 183-190. ISSN 1061-0278

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Abstract:The synthesis of a novel class of molecules for second order nonlinear optics, i.e. calix[4]arenes with extended π-systems, is described. These compounds are obtained via Wittig-Horner reactions of the formylated calix[4]arenes 5 and 6 to give the stilbene derivatives 7-9, or by diazotization of calix[4]arene, 1, followed by alkylation to give the phenylazocalix[4]arenes 11 and 12. The molecular second order nonlinear optical properties (βz) of these calix[4]arenes have been measured by electric field-induced second harmonic generation. The influence of different acceptors as well as the influence of the different conformations of the calix[4]arenes on βz values were determined. Surprisingly, the wavelength of the charge-transfer band λmax is lower when βz increases upon increasing the number of acceptors.
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Copyright:© 1993 Taylor & Francis
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