Lanthanides have a complex electronic configuration due to the existence of 4f, 5d and 6s orbitals. Stabilization of these orbitals favors the 4fn open-shell oxidation states of +3 for most lanthanides. Excitation of 4f electrons and subsequent relaxation generates the spectroscopic properties which have made lanthanide complexes attractive for such a wide variety of application. Recently fblock/ d-block bimetallic complexes have attracted attention and their role as building blocks for polymeric materials is a significant field of study in recent years. In this research, the reaction of LnCl3.xH2O (Ln = La, Tb, Pr) with NH4[Cr(SCN)4(NH3)2] in DMF and ethanol were studied and the crystalline products were investigated by IR, NMR, UV-visible and fluorescence spectroscopy. The design goal for the d-block/f-block mixed metal complexes is to use the lower energy metal to ligand charge transfer (MLCT) transitions associated with the d-block metal to induce the lanthanide 4f–4f emission.

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