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Fascinating Role of the Number of f Electrons in Dipolar and Octupolar Contributions to Quadratic Hyperpolarizability of Trinuclear Lanthanides-Biscopper Schiff Base Complexes

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journal contribution
posted on 19.02.2016, 04:46 by Antonino Gulino, Ignazio L. Fragalà, Fabio Lupo, Graziella Malandrino, Alessandro Motta, Alessia Colombo, Claudia Dragonetti, Stefania Righetto, Dominique Roberto, Renato Ugo, Francesco Demartin, Isabelle Ledoux-Rak, Anu Singh
The trinuclear [Ln­(NO3)3(CuL)2] complexes (Ln = La, Ce, Sm, Eu and Er, L = N,N′-1,3-propylen-bis­(salicylideniminato) have been investigated by a combination of HLS and EFISH techniques to evaluate both the dipolar and octupolar contributions to their significant quadratic hyperpolarizability and to confirm that f electrons may tune their second-order NLO response. In the complexes investigated, the major contribution to the total quadratic hyperpolarizability is largely controlled by the octupolar contribution, but the values of both βEFISH and ∥βJ=1∥, that is the dipolar part, are significantly influenced by the number of f electrons, confirming that the unexpected polarizable character of f electrons may be the origin of such fascinating evidence.

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