The Relevance of the Octupolar Contribution to the Quadratic Hyperpolarizability of Dipolar Neutral Ir(III), Pt(II) and Ru(II) Complexes
Claudia Dragonetti, Stefania Righetto, Dominique Roberto, Renato Ugo, Adriana Valore, and Isabelle Ledoux-Rak
Various neutral dipolar Ir(III), Pt(II) and Ru(II) complexes characterized by a high μβ1.907 value, as determined by the Electric Field Induced Second Harmonic generation (EFISH) technique, show a large <βHLS,1.907>, as determined by the Harmonic Light Scattering (HLS) technique. A combination of both techniques is used to evaluate the dipolar and octupolar contributions to the total quadratic hyperpolarizability, putting in evidence that the major contribution is controlled by the octupolar part.
Keywords: Quadratic hyperpolarizability, cyclometallated Ir complex, cyclometallated Pt complex, Ru complex, second order NLO properties, non linear optics.