Preparation, characterization and luminescence behavior of some samarium complexes
Archana Chauhan, Ritu Langyan
Abstract
Abstract The synthesis of luminescent complexes of Sm(III) with the general formula [Sm(L) 3 ·(X)] was done in powder form. In the formula, L is 6‐methyl‐4‐oxo‐4H‐1‐benzopyran‐3‐carboxaldehyde and X represents 2H 2 O (C1), 1,10‐phenanthroline (C2), 2,2′‐bipyridine (C3); bathophenanthroline (C4) and neocuproine (C5). The complexes were characterized by using various analytical and spectroscopic tools like elemental analysis, electrospray ionization mass spectrometry (ESI–MS + ), Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–Vis) spectroscopy, thermo‐gravimetric analysis/ differential thermal gravimetric analysis (TGA/DTG), field emission scanning electron microscopy (FESEM), powder X‐ray diffraction (XRD), and photoluminescence (PL) studies. TGA/DTG showed high thermal stability of synthesized complexes. Powder XRD depicts that the average particle size lies in the nano‐range. On monitoring at the excitation wavelength of 370 nm, the complexes display characteristic luminescence peaks of Sm(III) at ~ 564, ~ 600 and ~ 647 nm assigned to 4 G 5/2 → 6 H 5/2 , 4 G 5/2 → 6 H 7/2 , and 4 G 5/2 → 6 H 9/2 transitions, respectively, with the most intense transition at ~ 600 (orange emission) and ~ 647 nm (bright red emission) in liquid and powder state, respectively. The investigations demonstrate that the synthesized novel complexes might be practically useful in electroluminescent devices, bio‐assays, and liquid lasers due to their attractive photoluminescent properties.