Abstract
Molecular quadratic hyperpolarizability ( β c) of substituted polychlorinated triphenylmethyl radicals, 1– 8, has been determined by using the harmonic light scattering (HLS) technique. Results showed that this opens-shell family known to possess a good chemical stability also exhibited a very large SONLO response. The presence of a permanent dipole moment in the ground state for some of these octupolar compounds makes them attractive candidates for further orientation by the poling technique. Data of compounds 1– 8 have been discussed on the basis of a model describing the evolution of the β c response for D 3h and C 2v symmetry groups.
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