CF calculation, optical and magnetic characteristics of lanthanide chelate dimer systems

High resolution absorption and luminescence spectra at 298, 77 and 4 K were measured. The role of ligand singlet and triplet states and charge-transfer (C-T) states on efficiency of lanthanide emission have been discussed. The set of the crystal field (CF) Stark components were used in the CF calculations. The energy levels scheme was determined and satisfactory correlation between experimental and calculated levels was found. On the basis of obtained results the magnetic susceptibility were calculated for europium(III) and neodymium(III) systems. The calculated results quite good reproduce observed experimental values. The changes of magnetic susceptibility and magnetic moment with temperature are analyzed in the frame of weak metal-metal (M-M) interaction scheme.