Synthesis and photoluminescence characterization of the complexes of samarium dibenzoylmethanates with 1,10-phenanthroline derivatives

Abstract

The eight coordinated complexes of samarium were synthesized with dibenzoylmethane (DBM) and bidentate auxiliary ligand. Ternary complexes of samarium of the type [Sm(DBM)3L] (L = 1,10-Phenanthroline or its derivatives) were prepared by one step method. These complexes were characterized by spectroscopic techniques and thermo-gravimetric analysis. The proton-NMR data of all the complexes are reliable with the coordination of three DBM units and one neutral unit. Luminescence spectra of the complexes taken in powdered form, illustrate the bright red luminescence at 648 nm upon UV excitation that is accredited to the 4G5/2→6H9/2 transition of Sm3+ ion. The domination of hypersensitive transition corresponding to 648 nm reflects the asymmetric environment around samarium ion and their intensity undergoes significant change on variation in the binding environment about metal ion. The intense luminescence and color coordinates demonstrate that the complexes might be used as promising candidate in displays and light emitting devices.