LANGMUIR-BLODGETT-FILM AND 2ND-HARMONIC GENERATION OF A NEW-TYPE OF AMPHIPHILIC NONLINEAR-OPTICAL BIS-CHROMOPHORE COMPLEX DYE

A bivalent zinc complex anion: bis(2-thione-1,3-dithiol-4,5-dimercapto )zinc, has been chosen to balance several non-linear optical (NLO) dye cations in the design and synthesis of a series of novel bis-chromoph ore complex dyes. The Langmuir film-forming properties of these new NL O complex dyes at the air/water interface, the stability and second-or der non-linear optical properties of the monolayer and Langmuir-Blodge tt multilayer films were investigated. Results show that both the film -forming properties and NLO coefficiencies were improved greatly when the zinc complex anion was incorporated into four types of NLO-active organic dyes.