Synthesis and NLO Properties of Chromophores with 1,8‐Dimethoxy‐9,10‐dihydroanthracene and Thiobarbituric acid Moieties

Abstract

AbstractThe new chromophore molecules with nonlinear optical (NLO) properties were prepared by Knoevenagel condensation from 4,5‐diformyl‐1,8‐dimethoxy‐9,10‐dihydroanthracene and thiobarbituric acid derivatives in the presence of piperidine and acetic acid. In these chromophores, the ring‐locked triene employed as a conjugation bridge and the thiobarbituric acid moiety was as an electron acceptor in a D‐π‐A units. The solvatochromism and UV spectra indicate that they have higher second‐order nonlinear polarizability μβ values than the corresponding reference compound, without causing a large red shift of the charge transfer band.