Synthesis, characterization and spectroscopic study of Eu(III) complexes with 3-aminopicolinic acid derivatives

Bejan, Claudia Cristina Cardoso; Rocha, Gerd B.; Albuquerque, Rodrigo Q.; Demnitz, F. W. J.; Sá, Gilberto F. de; Alves, Severino

doi:10.1016/j.jlumin.2004.08.055

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…Selection rules for the electric dipole transition indicate that the 5 D 0 → 7 F 0 is only observed if the point symmetry of Eu 3+ is either C nv , C n or C s , again in accord with the structural models presented above. The 5 D 0 → 7 F 1 transition, which is ruled by a magnetic dipole mechanism and being largely independent of the ligand field effects, exhibits four well-defined Stark components, thus supporting the presence of a low site symmetry for Eu 3+ . The presence of a fourth emission line on the 5 D 0 → 7 F 1 transition can be attributed to electron/phonon coupling, caused by non-coordinated water molecules, delocalized from equilibrium position after the decreasing temperature .…”

Section: Resultsmentioning

confidence: 61%

Theoretical and Experimental Studies of the Photoluminescent Properties of the Coordination Polymer [Eu(DPA)(HDPA)(H₂O)₂]·4H₂O

et al. 2008

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We report on the hydrothermal synthesis of the [Eu(DPA)(HDPA)(H(2)O)(2)].4H(2)O lanthanide-organic framework (where H2DPA stands for pyridine-2,6-dicarboxylic acid), its full structural characterization including single-crystal X-ray diffraction and vibrational spectroscopy studies, plus detailed investigations on the experimental and predicted (using the Sparkle/PM3 model) photophysical luminescent properties. We demonstrate that the Sparkle/PM3 model arises as a valid and efficient alternative to the simulation and prediction of the photoluminescent properties of lanthanide-organic frameworks when compared with methods traditionally used. Crystallographic investigations showed that the material is composed of neutral one-dimensional coordination polymers infinity(1)[Eu(DPA)(HDPA)(H(2)O)(2)] which are interconnected via a series of hydrogen bonding interactions involving the water molecules (both coordinated and located in the interstitial spaces of the structure). In particular, connections between bilayer arrangements of infinity(1)[Eu(DPA)(HDPA)(H(2)O)(2)] are assured by a centrosymmetric hexameric water cluster. The presence of this large number of O-H oscillators intensifies the vibronic coupling with water molecules and, as a consequence, increases the number of nonradiative decay pathways controlling the relaxation process, ultimately considerably reducing the quantum efficiency (eta = 12.7%). The intensity parameters (Omega(2), Omega(4), and Omega(6)) were first calculated by using both the X-ray and the Sparkle/PM3 structures and were then used to calculate the rates of energy transfer (W(ET)) and back-transfer (W(BT)). Intensity parameters were used to predict the radiative decay rate. The calculated quantum yield obtained from the X-ray and Sparkle/PM3 structures (both of about 12.5%) are in good agreement with the experimental value (12.0 +/- 5%). These results clearly attest for the efficacy of the theoretical models employed in all calculations and create open new interesting possibilities for the design in silico of novel and highly efficient lanthanide-organic frameworks.

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Section: Resultsmentioning

confidence: 61%

Theoretical and Experimental Studies of the Photoluminescent Properties of the Coordination Polymer [Eu(DPA)(HDPA)(H₂O)₂]·4H₂O

et al. 2008

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“…The 1 H NMR spectra of Eu(p-CZB) 3 and hence spectral resolution is generally lost [17]. The 1 H NMR spectrum of Tb(p-CZB) 3 Fig.…”

Section: H Nmr Spectrummentioning

confidence: 99%

Synthesis and fluorescence studies on novel complexes of Tb(III) and Eu(III) with 4-(9H-carbazol-9-yl) benzoic acid

Pei

Geng

Jianbo³

et al. 2006

Journal of Alloys and Compounds

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“…Several coordination complexes based on diverse picolinic derivatives have already proven appealing photoluminescent properties on its picolinate skeleton [ 35 – 37 ]. Regarding the inorganic core, the potential application of lanthanide complexes in cancer therapy and diagnosis are growing great interest as a result of their luminescent and magnetic properties [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

Potential antiprostatic performance of novel lanthanide-complexes based on 5-nitropicolinic acid

García-García,

Cristobal-Cueto,

Hidalgo

et al. 2024

J Biol Inorg Chem

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Two new lanthanide-complexes based on the 5-nitropicolinate ligand (5-npic) were obtained and fully characterized. Single-crystal X-ray diffraction revealed that these compounds are isostructural to a Dy-complex, previously published by us, based on dinuclear monomers link together with an extended hydrogen bond network, providing a final chemical formula of [Ln2(5-npic)6(H2O)4]·(H2O)2, where Ln = Dy (1), Gd (2), and Tb (3). Preliminary photoluminescent studies exhibited a ligand-centered emission for all complexes. The potential antitumoral activity of these materials was assayed in a prostatic cancer cell line (PC-3; the 2nd most common male cancerous disease), showing a significant anticancer activity (50–60% at 500 μg·mL−1). In turn, a high biocompatibility by both, the complexes and their precursors in human immunological HL-60 cells, was evidenced. In view of the strongest toxic effect in the tumoral cell line provided by the free 5-npic ligand (~ 40–50%), the overall anticancer complex performance seems to be triggered by the presence of this molecule. Graphical Abstract

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Synthesis, characterization and spectroscopic study of Eu(III) complexes with 3-aminopicolinic acid derivatives

Cited by 5 publications

References 22 publications

Theoretical and Experimental Studies of the Photoluminescent Properties of the Coordination Polymer [Eu(DPA)(HDPA)(H₂O)₂]·4H₂O

Theoretical and Experimental Studies of the Photoluminescent Properties of the Coordination Polymer [Eu(DPA)(HDPA)(H₂O)₂]·4H₂O

Synthesis and fluorescence studies on novel complexes of Tb(III) and Eu(III) with 4-(9H-carbazol-9-yl) benzoic acid

Potential antiprostatic performance of novel lanthanide-complexes based on 5-nitropicolinic acid

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Synthesis, characterization and spectroscopic study of Eu(III) complexes with 3-aminopicolinic acid derivatives

Cited by 5 publications

References 22 publications

Theoretical and Experimental Studies of the Photoluminescent Properties of the Coordination Polymer [Eu(DPA)(HDPA)(H2O)2]·4H2O

Theoretical and Experimental Studies of the Photoluminescent Properties of the Coordination Polymer [Eu(DPA)(HDPA)(H2O)2]·4H2O

Synthesis and fluorescence studies on novel complexes of Tb(III) and Eu(III) with 4-(9H-carbazol-9-yl) benzoic acid

Potential antiprostatic performance of novel lanthanide-complexes based on 5-nitropicolinic acid

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Theoretical and Experimental Studies of the Photoluminescent Properties of the Coordination Polymer [Eu(DPA)(HDPA)(H₂O)₂]·4H₂O

Theoretical and Experimental Studies of the Photoluminescent Properties of the Coordination Polymer [Eu(DPA)(HDPA)(H₂O)₂]·4H₂O