Abstract
Abstract The association constants, Ka of KI, Nal and CaCl2 complexing with 1,4,7,10,13-pentaoxacyclopentadecane and 1,4,7,10,13,16-hexaoxacycloocta-decane in DHO were determined by the aid of 13C dipole-dipole relaxation time measurements. The mole fraction of the complexed ligand, PC were obtained by the use of the equation of 1/Tobs 1 - 1/T10 = PC (1/TO 1 - 1/T10) where the T10 and To 1 are the relaxation times of free and complexed macrocyclic ethers respectively. Ka values obtained from the above given equation depending on the cation concentration, [A+ O] typically reflected the relation between the cationic radius and cyclic ether ring size.
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