| Abstract
| - Second order nonlinear optical properties of a series of trinitrosubphthalocyanine (SubPc) isomers were studiedexperimentally by electric field induced second harmonic (EFISH) generation and hyper Rayleigh scattering(HRS). These experimental values were compared to the ones obtained theoretically employing both sumover states (SOS) and finite field (FF) methods. From these studies, it was shown that the dipolar contributionsto the β tensor are very much dependent on the substitution pattern at the periphery of the subphthalocyaninemacrocycle, whereas the octupolar contributions remain mostly unchanged. Consequently, it was deducedthat SubPc is extremely well suited for the decoupling of octupolar and dipolar contribution to the NLOresponse.
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