Measurement of the First Hyperpolarizability of Substituted Ketene N,S-acetals by Hyper-Rayleigh Scattering in Solution

The first hyperpolarizability βzzz of some substituted ketene N, S-acetals has been measured by Hyper-Rayleigh scattering in solution. The experiments show that the βvalues are as high as that of P -NA. The cut-off wavelenghts (λout off ) of the measured compounds are below 410nm, so they may be one kind of promising NLO materials.