FIRST-ORDER HYPERPOLARIZABILITIES OF SULFOPHTHALEIN DYES

In this paper we report the first hyperpolarizabilities (beta) of 12, sulfophthalein dyes. Since these dyes are ionic in nature, their secon d-order nonlinearities were measured by the hyper-Rayleigh scattering technique in solution. The measured beta values are large and highly s olvent dependent. Inclusion of solvent polarity in ab initio estimates of static second-order polarizability does not fully account for the experimental beta values. Contributions from the dissociated forms of the dye in different solvents seem to play an important role in enhanc ing beta in these systems.