Preparation and optical features of samarium(III) complexes introducing bidentate fluorinate and secondary ligands
- PDF / 1,719,913 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 37 Downloads / 233 Views
Preparation and optical features of samarium(III) complexes introducing bidentate fluorinate and secondary ligands Archana Chauhan1 and Ritu Langyan1,* 1
Department of Chemistry, Kurukshetra University, Kurukshetra, Haryana 136119, India
Received: 4 July 2020
ABSTRACT
Accepted: 18 October 2020
The syntheses of five luminescent samarium(III) complexes based on 6-Fluoro-4oxo-4H-1-benzopyran-3-carboxaldehyde (L) and bidentate ancillary ligands were reported. The bidentate ancillary ligands were 1, 10-phenanthroline, 2, 20 bipyridine, neocuproine, and bathophenanthroline. The complexes were characterized by employing elemental analysis, UV, FTIR, ESI–MS? spectrometry, TGA, FESEM, and PXRD. The luminescence properties of complexes in solution and powder state have been discussed to investigate optical characterization. The complexes display characteristic luminescence peaks of samarium(III) ion at * 566, 600, and 647 nm. Different coordination environments around samarium(III) ion in dimethyl sulfoxide solution and powder state result in different emission colors: bright orange and red color with intense peaks at * 600 nm and * 647 nm. The luminescent quantum yield, decay time, CCT, and CIE coordinates were considered. The replacement of aqua ligands by the bidentate subsidiary ligands from the parent complex enriched emission properties, thermal stability, decay time, and quantum yields. Interesting optical properties of complexes in the orange-red spectral region might be useful in electronic devices, bio-assays, and liquid lasers.
Ó
Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Abundant research on organo-lanthanide complexes has been done to date. The seven f orbitals of lanthanides are responsible for peculiar optical features such as line-like spectral bands, longer luminescence lifetime of the excited state, high purity of visibleregion color, and high quantum yield [1–3]. These
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10854-020-04711-x
interesting properties make them attractive materials in imaging, photonics, sensing, and coordination science [4, 5]. Among the lanthanide series, more importance is given to red and green luminescent trivalent europium and terbium ions [6–8]. Although the weaker luminescence intensity of trivalent samarium ion limits its research in material and optical science, researchers are still developing new samarium(III)-based luminescent compounds with
J Mater Sci: Mater Electron
improved emission properties [9]. The ligation of samarium(III) ion with an appropriate organic ligand (having a conjugated system and hetero-donor coordinative sites) could enhance the thermal stability and emission intensity of the spectral bands via antenna effect [10]. Generally, beta-diketones and aromatic acids are commonly used ligands because of their ability to transfer the absorbed ultraviolet (UV) energy to lanthanide(III) ions that give rise to metalcentered luminescence [11]. Chromones are heterocyclic compo
Data Loading...
