Precise determination of the first hyperpolarizability of a fluorescent triindole derivative with dicyanovinyl groups by the deconvolution method

The hyper-Rayleigh scattering (HRS) method was employed to investigate the first hyperpolarizability (β) of a triindole derivative with dicyanovinyl groups (TDCV). Because TDCV showed fluorescence due to two-photon absorption, we tried to precisely determine the β value of TDCV by observations of spectra composed of the HRS light and fluorescence and deconvolutions of the HRS light and fluorescence components with a slit function. Moreover, we tried to determine the depolarization ratio of the HRS light from TDCV by polarization measurement. As results, we have found that the β value of TDCV is (319 ± 13) × 10−30 esu at 1070.0 nm and TDCV can be classified as a purely octopolar molecule with the C3h symmetry.