Synthesis, crystal structures, and two-photon absorption of a series of cyanoacetic acid triphenylamine derivatives

Fluorescence, Phosphorescence, and Chemiluminescence

“…By varying the excitation wavelength, nonlinear spectroscopy, including two-photon absorption and two-photon fluorescence, of a wide range of samples can be studied in detail to understand the molecular interactions under intense incident light. As an example, a series of studies on the two-photon absorption properties and subsequent two-photon fluorescence of a series of cyanoacetic acid triphenylamine derivatives in toluene were recently reported . Here, the electron donor groups employed are the triphenylamine moiety, cyanoacetic acid moiety as electron acceptor groups, and vinylene or phenylethyne as the π-bridge.…”

“…As an example, a series of studies on the two-photon absorption properties and subsequent two-photon fluorescence of a series of cyanoacetic acid triphenylamine derivatives in toluene were recently reported. 75 Here, the electron donor groups employed are the triphenylamine moiety, cyanoacetic acid moiety as electron acceptor groups, and vinylene or phenylethyne as the π-bridge. It has been shown that the two-photon absorption cross section is affected by the length of the π conjugation chain in the infrared region, which leads to enhanced two-photon excited fluorescence.…”