Structural characteristics of some lanthanide violurate complexes

The magnetic moments and the electronic spectra of violurate complexes of Ce³⁺, Pr³⁺, Pr⁴⁺, Nd³⁺, Sm³⁺, Eu³⁺, Gd³⁺, Ho³⁺, Er³⁺, and Yb³⁺ have been investigated. The solid complexes are paramagnetic and have magnetic moment values near to the ground state values of the free ions. Few cases differ, since there exist possible electronic transitions (4f → 5d) in case of Ce³⁺ complexes and (f → f) for Ho³⁺ and Dy³⁺ complexes. The magnetic measurements in connection with the electronic spectra were used to decide the different electronic structural configuration of elements and hence the configuration of the coordination polyhedra around the central metal ions of the investigated complexes.