Multifunctional Langmuir-Blodgett film of an Amphiphilic Benziminazole Styryl Dye

An amphiphilic benziminazole styryl dye, 2-(4-dihexadecylaminostyryl)benziminazolium TCNQ-(DBTCNQ), was synthesized and successfully transferred onto the substrates by Langmuir-Blodgett(LB) technique. H-aggregates were formed on the substrates. Its monolayer second-order susceptibilityχ(2)zzz=109 p/mV) was determined with a polarized laser beam(Nd∶YAG, λ=1.064 μm). The photoelectrochemistry of the dye LB monolayer films was investigated in a traditional three-electrode cell. The quantum efficiency of photoelectric conversion is 1.08% under favorable conditions -200 mV, 0.5 mg/mL methylviologen diiodide(MV2+) in 0.5 mol/L KCl electrolyte solution]. The experimental data indicate that the LB film exhibits multifunctional properties.