Solid State Chemistry of Some Diacetylenic Acid Derivatives

An example of chemical reactivity in LB films is described, α and ω diyne long chain fatty acids are synthetized and their polymerization in multilayers studied. The reactivity depends on the position of the diyne along the alkylchain and on the metallic ion so far as the α diyonic acid salt is concerned. In LB films the chemical reactions are followed by infrared spectroscopy and the spectra are compared to those of model synthetic analyzed compounds. Decarboxylation often takes place under UV radiation or heat and leads to unpolymerisable material. From an oxidative coupling of the copper salt a tetrayne formation is presumed and a fast polymerization under visible radiation is observed