Tuning first molecular hyperpolarizabilities through the use of proaromatic spacers.
In this paper, we describe the second-order nonlinear optical properties of a series of 1,3-dithiole-based electron donor-acceptor systems incorporating proaromatic donor and spacer groups. Modification of the proaromaticity of the quinoid spacer gives rise to NLO-phores with mubeta values ranging from -2000 x 10(-)(48) esu to +3000 x 10(-)(48) esu. Quite surprisingly, compounds with a p-benzoquinoid spacer and a strong acceptor group show negative mubeta values, usually associated to zwitterionic ground states, and yet they are largely quinoid, as evidenced by crystallographic data and theoretical calculations. Progressive benzoannulation of the spacer and introduction of alkylsulfanyl substituents on the dithiole donor unit result in a shift to more positive mubeta values. DFT and ab initio calculations verify these empirical trends.
Andreu
Raquel
R
Departamento de Química Orgánica-ICMA, Universidad de Zaragoza-CSIC, E-50009 Zaragoza, Spain.
Blesa
Maria Jesús
MJ
Carrasquer
Laura
L
Garín
Javier
J
Orduna
Jesús
J
Villacampa
Belén
B
Alcalá
Rafael
R
Casado
Juan
J
Ruiz Delgado
Mari Carmen
MC
López Navarrete
Juan T
JT
Allain
Magali
M