Synthesis, optical properties and thermal behaviour of 1,3,4-oxadiazole-based twin dimers

The synthesis, optical properties and thermal behaviour of five new 1,3,4-oxadiazole-based light-emitting twin dimers are described. The synthesised compounds were obtained in good yields following a convergent synthetic approach. The products 8a-8e display blue fluorescence both in solution and in solid phases. All compounds exhibited dendritic crystalline growth. Furthermore, compound 8b also exhibited liquid crystal properties. Due their high thermal stabilities thin films of 8a-8e could be prepared by thermal evaporation technique. The morphology of the film surface was investigated using atomic force microscopy (AFM).