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A new class of nonlinear optical chromophores (NLO‐phores) with large off‐diagonal components of the second‐order polarization and remarkable transparency properties have been investigated. The synthesis and NLO characterization of a series of C 2n symmetry benzene derivatives, such as that shown in the Figure, are described. The results of UV‐vis, EFISH, hyper‐Rayleigh scattering, etc., measurements are compared. magnified image
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Wolff et al. (1997) studied this question.
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