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Experimental and theoretical investigations of the [Ln(β-dik) (NO3)2(phen)2]⋅H2O luminescent complexes
Journal of Luminescence ( IF 3.6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jlumin.2020.117455
Paulo R.S. Santos , Dariston K.S. Pereira , Israel F. Costa , Iran F. Silva , Hermi F. Brito , Wagner M. Faustino , Albano N. Carneiro Neto , Renaldo T. Moura , Maria H. Araujo , Renata Diniz , Oscar L. Malta , Ercules E.S. Teotonio

Abstract In this work, the coordination compounds presenting the formulas [Eu(acac)(NO3)2 (phen)2]⋅H2O (Eu1) and [Eu(bzac)(NO3)2(phen)2]⋅H2O (Eu2), acac: acetylacetonate, bzac: benzoylacetonate and, phen: 1,10-phenantroline, were successfully synthesized and some spectroscopic properties were investigated by theoretical and experimental methods. These compounds were characterized via elemental analysis, FTIR spectroscopy and thermogravimetric analysis (TGA). The X-ray diffraction data revealed that the compound Eu1 crystallizes in the monoclinic space group P2/n. Spectroscopic data showed that ligand-to-metal charge transfer states (LMCT) in the [Eu(β-dik)(NO3)2(phen)2]⋅H2O complexes (β-dik: acac or bzac) are redshift as compared with [Eu(β-dik)3(phen)] complexes. These data showed that LMCT states play the most important role on the luminescence quenching in the complexes Eu1 and Eu2, which only exhibit high luminescence intensities at low temperatures. Furthermore, the role of changes in the chemical environment on the intensity parameters Ωλ (λ = 2 and 4) have been investigated from the theoretical point of view for the complexes Eu1 to Eu2, and from these to tris β–dik complexes. Interestingly, the theoretical intensity parameters ratio Ω2/Ω4 calculated are in a good agreement with those experimental ones.

中文翻译:

[Ln(β-dik) (NO3)2(phen)2]⋅H2O 发光配合物的实验和理论研究

摘要 在这项工作中,配位化合物的分子式为 [Eu(acac)(NO3)2 (phen)2]⋅H2O (Eu1) 和 [Eu(bzac)(NO3)2(phen)2]⋅H2O (Eu2) , acac: 乙酰丙酮, bzac: benzoylacetonate 和, phen: 1,10-phenantroline, 被成功合成,并通过理论和实验方法研究了一些光谱特性。这些化合物通过元素分析、FTIR 光谱和热重分析 (TGA) 进行表征。X 射线衍射数据表明化合物 Eu1 在单斜空间群 P2/n 中结晶。光谱数据表明,[Eu(β-dik)(NO3)2(phen)2]·H2O 配合物(β-dik:acac 或 bzac)中的配体-金属电荷转移态 (LMCT) 与[Eu(β-dik)3(phen)] 络合物。这些数据表明,LMCT 态对配合物 Eu1 和 Eu2 中的发光猝灭起最重要的作用,它们仅在低温下表现出高发光强度。此外,从理论角度研究了化学环境变化对强度参数 Ωλ(λ = 2 和 4)的作用,研究了配合物 Eu1 到 Eu2,以及从这些到 tris β-dik 配合物。有趣的是,计算出的理论强度参数比值 Ω2/Ω4 与那些实验值非常吻合。从这些到tris β-dik复合物。有趣的是,计算出的理论强度参数比值 Ω2/Ω4 与那些实验值非常吻合。从这些到tris β-dik复合物。有趣的是,计算出的理论强度参数比值 Ω2/Ω4 与那些实验值非常吻合。
更新日期:2020-10-01
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