Applications of spectroscopic methods in studies of polyoxometalates and their complexes with lanthanide(III) ions

In recent years many studies have been devoted to polynuclear compounds because of their unusual structural features and/or magnetic and optical properties. This lecture deals with a group of homo- and heteronuclear polymeric, as well as monomeric, lanthanide systems. It will be shown that several structural factors influence in a special way their spectroscopic and magnetic properties. Absorption, emission and excitation spectra down to 5 K will be analysed and related to X-ray crystallographic data. Radiative and non-radiative processes will be considered; cooperative interactions and the role of vibronic coupling, including the resonance effect, will be analysed. Spectroscopic properties of the complexes will be correlated with magnetic and EPR data. Selected dynamics aspects in the solid state will also be discussed.