LANGMUIR MONOLAYER FORMATION OF METAL-COMPLEXES FROM POLYMERIZABLE AMPHIPHILIC LIGANDS

The monolayer behaviour of 4-(10,12-pentacosadiynoicamidomethyl)-pyrid ine at the air-water interface was studied by measuring the surface pr essure-area isotherms. The amphiphile formed stable monolayers with a clear liquid-expanded (LE) to liquid-condensed phase transition at var ious temperatures. Upon addition of transition metal ions to the subph ase complexation at the air-water interface occurred causing an increa se of the pressure (IIc) at which the phase transition appeared. With complete complexation the phase transition disappeared and the monolay er had only the characteristics of a LE phase. The amount of complexat ion depended strongly on the transition metal used. Moreover, the meta l ion concentration, complexation time, temperature, counter ion and t he ionic strength of the subphase had a great effect on the complexati on behaviour of this amphiphile.