INVESTIGATION OF 2 (DOCOSYLAMINO)-5-NITROPYRIDINE MONOLAYERS AND LANGMUIR-BLODGETT-FILMS

The behavior of 2-(docosylamino)-5-nitropyridine (DCANP) spreading mon olayers was investigated as a function of temperature, pH, and subphas e composition. The interactions of DCANP monolayers with copper ions d issolved into the subphase at different concentrations were also studi ed. The investigations were carried out by measuring surface pressure and surface potential-area isotherms. Langmuir-Blodgett (LB) films tra nsferred from pure water and, copper aqueous subphases were also studi ed by Fourier transform infrared (FTIR), UV-vis, and electron paramagn etic resonance (EPR) spectroscopies, X-ray photoelectron spectroscopy (XPS), ellipsometry, and refractive index measurements. The interactio ns between copper ions and DCANP molecules were investigated by means of various techniques in the bulk phase, in monolayers, and in LB film s. Clear evidence of interactions between DCANP and copper ions was pr ovided only from EPR spectroscopy in the LB films, because of the very small molar ratio of bound/free DCANP in the LB films. The refractive index of Cu-doped LB films was shown to be increased by the presence of metal ions.