TRANSPORT-PROPERTIES OF LITHIUM PICRATE AND LITHIUM PERCHLORATE IN ISODIELECTRIC SOLVENTS AND IN THEIR MIXTURES WITH THE 15-CROWN-5 MACROCYCLIC LIGAND

Electrical conductance measurements of lithium picrate and lithium per chlorate in isodielectric solvents (i.e. acetonitrile, methanol and N, N-dimethylformamide in the concentration range 10(-4) less-than-or-equ al-to c/mol dm-3 less-than-or-equal-to 10(-2) are reported. The data a nalysed by the Fuoss three-parameter equation have shown that. in spit e of the similarity of the macroscopic dielectric constants of the sol vents, the ion pair association constants of both electrolytes strongl y depend on the molecular details of ions and solvent molecules. The c omplexation of lithium ion by the 15-crown-5 (15C5) macrocyclic ligand in the above solvents has also been investigated. The results show th at the presence of 15C5 increases the ionization of the electrolytes i n relation to the solvation efficiency of the solvents. Such a result is of particular interest in view of the technological applications of lithium salt solutions.