Langmuir-Blodgett films from Schiff base aluminium (III) complex

The characteristics of the LB films of Schiff base aluminium(II), tris(2-hydroxy-5-nitro-N-dodecyl- benzylideneaminato) aluminium (III) [Al(TA12)(3)], were studied. The surface pressure-area(pi -A) isotherm of Al(TA12)(3) in the pure water subphase was investigated. The molecular area, 0. 48 nm(2), is one-third of the expected value that indicates the formation of an aggregate. The Langmuir-Blodgett(LB) films of Al(TA12)(3) were transferred and characterized. The UV-Vis spectra and the AFM image both confirmed that the J-aggregates formed. The polarized UV-Vis spectra indicated that the complex plane had to be oriented with an angle of about 30 degrees to the substrate surface. The IR spectra suggested that the complexation took place between aluminium ions and the oxygen atoms of the ligand rather than the nitrogen atom.