The following have been demonstrated as solution equilibria, with dete
ctable population of several isomers. [GRAPHICS] erification or for RN
A cleavage. Replacement of one of the amide coordinating groups to for
m a new heptadentate ligand yields a europium(III) complex ([Eu(NBAC)]
(3+)) that is a very active catalyst for phosphate diester transesteri
fication at 37 degrees C, pH 7.40. Laser-induced luminescence is used
to study the number of bound water molecules and self-association of t
he [Eu(NBAC)](3+) complex as well as the dissociation of the complex i
n the presence of competing ligands. [GRAPHICS]