EFFECT OF SOLVENT AND STRUCTURE OF CROWN ETHERS ON THE ELECTRON-TRANSFER PROPERTIES OF EUROPIUM COMPLEXES

Electrochemical reduction processes of Eu complexes with crown ethers have been investigated in nonaqueous media by cyclic voltammetry. Significant effect of solvent and structure of crown ethers on the reduction processes is found. Coordination of crown ethers in weak bonding solvents is favorable to stabilize the divalent europium, so that the half-wave potentials of Eu3+ for reduction reaction shifts anodically almost 200 mV. The complex systems may exhibit a EC scheme owing to the..