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.
|Number of pages||9|
|Publication status||Published - Oct 5 1998|
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry