Azulene-containing donor-acceptor compounds as second-order nonlinear chromophores

Abstract Several novel, thermally stable azulene-containing donor-acceptor molecules were synthesized and their second-order nonlinear optical properties determined by the EFISH method. The βμ-values for these new compounds featuring azulene as the pi-electron donor were comparable with NLO compounds containing para-N,N-diethylaniline as the electron-donor.