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Competitive spectrophotometric study of complexation of dibenzopyridino-18-crown-6 with Ca2+, Sr2+, and Ba2+ in binary dimethylsulphoxide-acetonitrile solutions

The complexation of dibenzopyridino-18-crown-6 (DBPY18C6) with Ca 2 + , Sr 2 and Ba 2 + has been studied in binary dimethylsulphoxide - acetonitrile mixtures at 25°C by a competitive spectrophotometric technique, using murexide as a metal ion indicator. Stoichiometry and stability of the resulting complexes were evaluated by KINFIT program. The stability of 1:1 complexes prepared were found strongly solvent dependent. There is an inverse linear relationship between log K f and mole fraction of dimethylsulphoxide (DMSO) in the solvent. In all these solvents the increase of%AN increases the stability of DBPY18C6 complexes with alkaline earth cations in the sequence Ba 2 + > Sr 2 + > Ca 2 + .