title: An unprecedented switching of the second-order nonlinear optical response in aggregate bis(salicylaldiminato)zinc(II) Schiff-base complexes.
abstract: A luminescent bis(salicylaldiminato)zinc(II) Schiff-base complex, 1, is characterized by a concentration dependent second-order nonlinear optical response, related to the degree of aggregation of the complex in a dichloromethane solution. The formation of the monomeric adduct, by addition of a Lewis base, such as pyridine, to concentrated solutions of 1, leads to a switch-on of the quadratic hyperpolarizability. This represents an unprecedented mode of NLO switching in molecular materials.
authors.affiliation: Dipartimento di Scienze Chimiche, Università di Catania, I-95125 Catania, Italy. sdibella@unict.it
authors.forename: Santo
authors.initials: S
authors.lastname: Di Bella
authors.forename: Ivan Pietro
authors.initials: IP
authors.lastname: Oliveri
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