A. Ishida et al., EXAFS STUDIES ON THE INTERACTION BETWEEN EU3-ETHERS IN ORGANIC-SOLVENTS( AND CROWN), Physica. B, Condensed matter, 209(1-4), 1995, pp. 711-713
Coordination environments of EU(3+) in a solution were studied by use
of XAFS. An acetonitrile solution of europium(III) perchlorate gave a
strong peak at 0.25 nm, which suggests strong coordination of the coun
ter perchlorate ion to Eu3+. Upon addition of 18-crown-6 ether, a new
peak appears at 0.35 nm assigned to a coordination of the oxygen atom
of the crown. The efficiency of a crown complexation depended on the c
haracter of the counter anion and on the cavity size of the crown.