Second-order nonlinear optical molecular switches are systems displaying marked variations of their second harmonic generation (SHG) responses upon external stimulation. In this article, we combine a multiscale computational method and experimental characterizations to provide a full description of the SHG responses of molecular switches built from the association of the indolino-oxazolidine unit to a bithiophene donor. In chloroform solutions, the addition of trifluoroacetic acid triggers the switching from a neutral closed form to a protonated open form, making an ion pair with the trifluoroacetate counterion and induces a strong enhancement of the SHG responses. The numerical simulations (i) evidence how the large and rapid thermally induced geometrical fluctuations lead to broadening the SHG responses distributions, making even difficult the determination of their sign, (ii) rationalize the variations of these responses as a function of the closure/opening of the oxazolidine ring and of the nature of its chemical substitution, and (iii) call into question common assumptions employed when analyzing the experimental SHG responses.
Dynamical Behavior and Second Harmonic Generation Responses in Acido-Triggered Molecular Switches / K. Pielak, C. Tonnelé, L. Sanguinet, E. Cariati, S. Righetto, L. Muccioli, F. Castet, B. Champagne. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - 122:45(2018 Nov 15), pp. 26160-26168.
|Titolo:||Dynamical Behavior and Second Harmonic Generation Responses in Acido-Triggered Molecular Switches|
CARIATI, ELENA (Corresponding)
|Parole Chiave:||Electronic, Optical and Magnetic Materials; Energy (all); Physical and Theoretical Chemistry; Surfaces, Coatings and Films|
|Settore Scientifico Disciplinare:||Settore CHIM/03 - Chimica Generale e Inorganica|
|Data di pubblicazione:||15-nov-2018|
|Data ahead of print / Data di stampa:||17-ott-2018|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1021/acs.jpcc.8b08697|
|Appare nelle tipologie:||01 - Articolo su periodico|