title: Fascinating role of the number of f electrons in dipolar and octupolar contributions to quadratic hyperpolarizability of trinuclear lanthanides-biscopper Schiff base complexes.
abstract: 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 [parallel]β(J=1)[parallel], 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.
authors.affiliation: Dipartimento di Scienze Chimiche, Università di Catania and INSTM UdR of Catania, Viale Andrea Doria 6, 95125 Catania, Italy. agulino@dipchi.unict.it
authors.forename: Antonino
authors.initials: A
authors.lastname: Gulino
authors.forename: Ignazio L
authors.initials: IL
authors.lastname: Fragalà
authors.forename: Fabio
authors.initials: F
authors.lastname: Lupo
authors.forename: Graziella
authors.initials: G
authors.lastname: Malandrino
authors.forename: Alessandro
authors.initials: A
authors.lastname: Motta
authors.forename: Alessia
authors.initials: A
authors.lastname: Colombo
authors.forename: Claudia
authors.initials: C
authors.lastname: Dragonetti
authors.forename: Stefania
authors.initials: S
authors.lastname: Righetto
authors.forename: Dominique
authors.initials: D
authors.lastname: Roberto
authors.forename: Renato
authors.initials: R
authors.lastname: Ugo
authors.forename: Francesco
authors.initials: F
authors.lastname: Demartin
authors.forename: Isabelle
authors.initials: I
authors.lastname: Ledoux-Rak
authors.forename: Anu
authors.initials: A
authors.lastname: Singh