FTC-containing molecules: large second-order nonlinear optical performance and excellent thermal stability, and the key development of the Isolation Chromophore'' concept

A series of second-order nonlinear optical (NLO) molecules, M1-M5, were designed and successfully synthesized through the convenient click chemistry'' reaction, which contain two different types of chromophore moieties, the FTC chromophore and nitro-based azo ones, according to the concept of Isolation Chromophore''. All these five molecules possess excellent thermal stability and very large NLO performance, with an ultrahigh d(33) value of 384 pm V-1 at the wavelength of 1950 nm achieved for M1, furthering the rational design of excellent NLO materials.