Lanthanide coordination compounds with benzimidazole-based ligands. luminescence and EPR

Olea-Román, Daniela; Peralta, Alejandro; Pistolis, George; Petrou, Athinoula L.; Kaloudi-Chantzea, Antonia; Esturau‐Escofet, Nuria; Durán-Hernández, Jesús; Sosa‐Torres, Martha E.; Castillo‐Blum, Silvia E.

doi:10.1016/j.molstruc.2018.02.062

Cited by 13 publications

(4 citation statements)

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“…For samples containing dysprosium, we observed a yellow emission around 572 nm corresponding to the hypersensitive transition 4 F 9/2 -6 H 13/2 (electric dipole allowed) in Dy 3+ . 50,51 As can be noticed for this transition, its intensity changes due to the dysprosium concentration being the largest photoluminescence registered for Dy 3+ at 1%. This doping value coincides with the nominal atomic percentage determined by EDS (see the ESI, † S3) and agrees with that reported in previous work for Dy@Gd 2 O 3 nanostructures.…”

Section: Resultsmentioning

confidence: 74%

Structural and optical characterisation of silanised Dy-doped-Gd₂O₃ NPs

Armenta-Jaime

González

Salas-Martin

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 74%

Structural and optical characterisation of silanised Dy-doped-Gd₂O₃ NPs

Armenta-Jaime

González

Salas-Martin

et al. 2023

Phys. Chem. Chem. Phys.

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“…Benzimidazole compounds [ 1 – 5 ] are aromatic heterocyclic compounds containing two nitrogen atoms. Benzimidazole derivatives and metal complexes exhibit good biological activity.…”

Section: Introductionmentioning

confidence: 99%

Study on the host–guest complex of dicyclohexanocucurbit[6]uril and 2-phenylbenzimidazole, and its recognition effect toward Fe ³⁺

Zheng

Gao

et al. 2021

R. Soc. open sci.

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This paper has selected dicyclohexanocucurbit[6]uril (CyH 2 Q[6]) as the host and 2-phenylbenzimidazole ( G ) as the guest to investigate the host–guest interaction mode between CyH 2 Q[6] and G . Under acidic conditions, the complex was characterized using nuclear magnetic resonance, ultraviolet and fluorescence spectroscopy. The results show that the molecular ratio of CyH 2 Q[6] to G is 2 : 1. The crystals were cultured with ZnCl 2 as a structural inducer under acidic conditions and single crystal X-ray diffraction showed that the molecular ratio of CyH 2 Q[6] to G is 1 : 3. The G@CyH 2 Q[6] was used as a fluorescent probe to identify metal cations. The probe exhibits a good selective recognition effect toward Fe 3+ ions, which involves a reduced fluorescence intensity with a limit of detection of 1.321 × 10 –6 mol l –1 .

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“…For example, 2-arylbenzimidazoles can form bonds through substituents on the benzene ring (non-core) and the nitrogen atom (with sp 2 hybridization) of the imidazole, forming stable complexes with various metals, either as monodentate ligands [6,7], N,O-chelate bidentate ligands [8,9], or N,N,O-chelate tridentate ligands [10]. However, the studies of complexes of 2-arylbenzimidazoles with rare earth elements are scarce [11]. Lanthanide (Ln) coordination complexes are of interest due to their biological activities [12,13,14], specific physicochemical properties, unusual electronic configurations, and distinctive multielectron redox chemistry.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, biological evaluation and model membrane studies on metal complexes containing aromatic N,O-chelate ligands

Aragón-Muriel

Liscano

Rufino‐Felipe

et al. 2020

Heliyon

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Novel lanthanide (Ln) compounds [Ln(L) 2 ]Cl . xH 2 O (Ln ¼ La 3þ , Ce 3þ , Sm 3þ ) containing aromatic N,O-chelate ligands [HL1 ¼ 4-amino-2-(1H-benzimidazol-2-yl)phenol; HL2 ¼ 5-amino-2-(1H-benzimidazol-2-yl)phenol] have been synthesized and structurally characterized by elemental analysis, NMR and IR spectroscopy, molar conductance measurements, and mass spectrometry (MS). The spectroscopic data suggested that the benzimidazolyl-phenol ligands act as N,O-chelate ligands through the iminic nitrogen and phenolic oxygen atoms. Elemental analysis indicated that lanthanide compounds were formed in a 1:2 stoichiometry (metal:ligand). In vitro biological evaluation was carried out using these complexes, exhibiting moderate cytotoxicity against six different human tumor cell lines (U251, human glioblastoma; HCT-15, colorectal carcinoma; MCF-7, breast epithelial adenocarcinoma; PC-3, prostate cancer; K562, myelogenous leukemia; SKLU-1, lung carcinoma) and lower toxicity against a non-cancerous cell line (COS-7, primate kidney). In addition, the antibacterial activity of the compounds was assessed against two gram-positive strains (Staphylococcus aureus ATCC 25923, Listeria monocytogenes ATCC 19115) and two gram-negative strains (Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27583) using the microdilution method. The results obtained show that the metal complexes exhibit higher biological activity than the free ligands, confirming a synergistic effect. Further benzimidazolyl-phenol derivatives were explored for the detection of bacteria using fluorescence imaging studies. Interestingly, the fluorescent properties of these compounds make them potential candidates to monitor the morphology of bacteria at different compound concentrations. Hence, the interaction of the ligand and complexes with model membranes mimicking those of bacteria was studied by using differential scanning calorimetry (DSC) and molecular dynamics (MD), showing that both compounds decreased the enthalpy of transition in two model membranes as the concentration of the compounds increased. In addition, the main transition temperature was slightly reduced as a result of these interactions.

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Lanthanide coordination compounds with benzimidazole-based ligands. luminescence and EPR

Cited by 13 publications

References 46 publications

Structural and optical characterisation of silanised Dy-doped-Gd₂O₃ NPs

Structural and optical characterisation of silanised Dy-doped-Gd₂O₃ NPs

Study on the host–guest complex of dicyclohexanocucurbit[6]uril and 2-phenylbenzimidazole, and its recognition effect toward Fe ³⁺

Synthesis, biological evaluation and model membrane studies on metal complexes containing aromatic N,O-chelate ligands

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Lanthanide coordination compounds with benzimidazole-based ligands. luminescence and EPR

Cited by 13 publications

References 46 publications

Structural and optical characterisation of silanised Dy-doped-Gd2O3 NPs

Structural and optical characterisation of silanised Dy-doped-Gd2O3 NPs

Study on the host–guest complex of dicyclohexanocucurbit[6]uril and 2-phenylbenzimidazole, and its recognition effect toward Fe 3+

Synthesis, biological evaluation and model membrane studies on metal complexes containing aromatic N,O-chelate ligands

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Structural and optical characterisation of silanised Dy-doped-Gd₂O₃ NPs

Structural and optical characterisation of silanised Dy-doped-Gd₂O₃ NPs

Study on the host–guest complex of dicyclohexanocucurbit[6]uril and 2-phenylbenzimidazole, and its recognition effect toward Fe ³⁺