Preparation and photoluminescent analysis of Sm3+ complexes based on unsymmetrical conjugated chromophoric ligand

Abstract

The octa-coordinated complexes of Sm(III) with β-diketone and nitrogen-heterocyclic bidentate auxiliary moiety were prepared and characterized spectroscopically. Spectral outcomes of complexes have suggested the isostructural behavior of ternary complexes. Optical bandgap (Eg) values of complexes were evaluated from Tauc’s plot. The photoluminescence emission spectra of ternary complexes show Sm3+-based peaks at 566, 601, 648, and 707 nm attributed to 4G5/2 → 6HJ (J = 5/2–11/2) transitions. Most intense peak at 648 nm is responsible for orange-red emanation of samarium complexes. Colorimetric analysis of complexes supports the results of emission spectra. The fascinating optical properties of ternary metal complexes in the orange-red visible spectral region might be valuable in designing optoelectronic devices and displays.