Solid samples prepared from benzo-15-crown-5, its nitro, acetylamino and decanoylamino derivatives (Group I), and chloro-dibenzo-aza-crown ethers (Group II) with alkali metal salts were studied. The existence of solid adducts between LiBr, NaSCN, KSCN and crown ethers of group I was proved by DSC. The melting points of adducts of the same ligand were found to increase in KSCN<NaSCN<LiBr order. DSC and TG results suggested a ligand scission mechanism of thermal decomposition for all the complexes except that of benzo-15-crown-5 and KSCN where a dissociation and evaporation process took place. The samples prepared from crown ethers belonging to group II were found to be mechanical mixtures of the alkali salts and crown compounds.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry