Dehydration processes for lanthanoid(III) chloranilate complexes studied by EXAFS

Abstract

Temperature dependences of the local structures of chloranilate complexes of Pr(III), Nd(III), Tb(III), and Er(III) were studied by EXAFS (extended X-ray absorption fine structure) in order to reveal the process of the dehydration for the coordinated water molecules. The coordination number around central lanthanoid(III) ion was reduced stepwise as temperature increases, which behaviour depends on the kind of central lanthanoid(III) ion. Accompanying the decrease of the coordination numbers, the interatomic distances between central lanthanoid(III) ion and oxygen atoms in a first shell decrease.