Preparation, characterization and luminescence behavior of some samarium complexes
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Preparation, characterization and luminescence behavior of some samarium complexes Archana Chauhan, Ritu Langyan*
Received: 23 October 2019 / Revised: 20 January 2020 / Accepted: 27 July 2020 Ó The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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-1benzopyran-3-carboxaldehyde and X represents 2H2O (C1), 1,10-phenanthroline (C2), 2,20 -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 4G5/2 ? 6H5/2, 4G5/2 ? 6H7/2, and 4G5/2 ? 6H9/2 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
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12598-020-01552-9) contains supplementary material, which is available to authorized users. A. Chauhan, R. Langyan* Department of Chemistry, Kurukshetra University, Kurukshetra 136119, India e-mail: [email protected]
electroluminescent devices, bio-assays, and liquid lasers due to their attractive photoluminescent properties. Keywords Samarium complexes; Luminescence; Thermal analysis; Quantum yield
1 Introduction German scientist Eilhard Wiedemann proposed the term ‘‘luminescenz’’ in 1888, which means ‘‘spontaneous emission of radiation from an electronically excited species’’ [1]. Luminescent lanthanide complexes play a crucial role in modern life. Researchers are growing interest in lanthanide chemistry due to its potential and practical applications in various fields such as biomedical analysis, audio applications, telecommunication, agriculture, optical science, electroluminescent devices, and biomedical analysis [2–6]. However, Ln(III) ions show weaker emission; their luminescence intensity can be enhanced if suitable organic ligands bind with these ions. An organic ligand consisting of hetero-donor atoms can absorb energy and efficiently transfer to Ln(III) ion via ‘‘antennae effect’’ [7]. Chromones are a broad class of naturally
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