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• W3013237495 abstract "Four new heteroleptic asymmetric fluorinated β-diketone based [Sm(fod) 3 ] adducts with organic ligands of different denticities (monodentate indazole and triphenylphosphine oxide (tppo), bidentate imidazolyl pyridine (impy) and tridentate 2,4,6-tris(2-pyridyl)- s -triazine (tptz)) have been synthesized and characterized in order to examine the suitability of organic co-ligands as a sensitizer for Sm(III) luminescence. The photoluminescence of the complexes is studied in chloroform and solid state. The dominance of the hypersensitive transition 4 G 5/2 → 6 H 9/2 reflects the asymmetry around the Sm (III) ion in the present complexes which is supported by the large values of intensity ratio (R Sm ). The stark splitting in magnetic dipole 4 G 5/2 → 6 H 7/2 transition in the cases of eight coordinate [Sm(fod) 3 (impy)] ( 3) and [Sm(fod) 3 (tppo) 2 ] ( 4) complexes is similar. However, the splitting pattern of 3 and 4 is distinctively different from the nine- [Sm(fod) 3 (tptz)] ( 1) and seven-coordinate [Sm(fod) 3 (indazole)] (2) complexes. The intensity of the hypersensitive transition and stark splitting of magnetic dipole transition changes significantly upon change in the ligand environment around the Sm (III). The bright luminescence from these complexes reflects efficient energy transfer from the selected sensitizers to Sm (III) ion. It is worth mentioning that the lifetime for 4 G 5/2 → 6 H 9/2 transition of complex 3 in solid state is 269 μs which is higher than the lifetime of this transition noted for most of the tris(β-diketonate)Sm(III) reported so for. The emission colour from chloroform solution of [Sm(fod) 3 (tppo) 2 ] ( 4 ) changes from parrot green to orange red upon change in excitation wavelengths. Of the selected sensitizers, the impy is most efficient since the emission from its complex is most intense. The new [Sm(fluorinated β-diketone) 3 ] adducts with different heterocyclic lewis bases are synthesized and characterized by various analytical and spectroscopic techniques. The IR and 1 H NMR of these paramagnetic complexes is discussed. The longer lifetime and higher intrinsic quantum yield of the complexes reveals the efficient energy transfer from the selected sensitizers to Sm (III). Of the selected sensitizers, the impy is most suitable for efficient sensitization since the emission from its complex is most intense. The emission colour of [Sm(fod) 3 (tppo) 2 ] changes from parrot green to orange red upon change in excitation wavelength. • New [Sm(fluorinated β-diketone) 3 ] adducts with different heterocyclic Lewis bases are synthesized and characterized. • The IR and 1 H NMR of these paramagnetic complexes is discussed. • Longer lifetime and higher intrinsic quantum yield reflect efficient energy transfer from the selected sensitizers to Sm 3+ . • The emission from impy complex is most intense hence it is most efficient sensitizer. • The emission colour of [Sm(fod) 3 (tppo) 2 ] changes from parrot green to orange red upon change in excitation wavelength. ." @default.
• W3013237495 created "2020-04-03" @default.
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• W3013237495 date "2020-08-01" @default.
• W3013237495 modified "2023-10-17" @default.
• W3013237495 title "Samarium complexes with fluorinated β-diketone and heterocyclic Lewis bases as UV light converters" @default.
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• W3013237495 doi "https://doi.org/10.1016/j.dyepig.2020.108383" @default.
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