Europium(III)-asparagine complexation in aqueous methanol

A problem of long-term interest in lanthanide chemistry is whether a ligand resides in the cation's inner or outer solvation shell. Using asparagine a s part of a study of Eu(III) and amino acids to determine complexation diff erences, only the one-to-one complex forms and the complexation thermodynam ics are consistent with inner-sphere complexation. The substitution of wate r by methanol causes only a small increase in the complexation constant. (C ) 2001 Elsevier Science B.V. All rights reserved.