Photophysical properties and computational study of newly synthesized lanthanide complexes with N-(2-carboxyphenyl)salicylideneimine Schiff base ligand

Taha, Ziyad A.; Hijazi, Ahmed K.; Ababneh, Taher S.; Mhaidat, Ibrahim; Ajlouni, Abdulaziz M.; Al-Hassan, Khader A.; Mitzithra, C.; Hamilakis, Stylianos; Danladi, Fahad; Altalafha, Ammar Y.

doi:10.1016/j.jlumin.2016.09.019

Cited by 13 publications

(4 citation statements)

References 43 publications

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“…Figure clearly shows that Ln–L complexes are more effective than L in quenching DPPH. This enhancement in the activity can be attributed to the formation of lanthanide–ligand complexes that enhances the HAT process . At the concentration of 312.5 μM, the Dy–L complex with activity of 34% was the strongest quencher and La–L complex with activity of 11% was the poorest effective quencher of all complexes.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, density functional theory calculations and luminescence of lanthanide complexes with 2,6‐bis[(3‐methoxybenzylidene)hydrazinocarbonyl] pyridine Schiff base ligand

et al. 2017

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A pyridine-diacylhydrazone Schiff base ligand, L = 2,6-bis [(3-methoxy benzylidene) hydrazinocarbonyl]pyridine was prepared and characterized by single crystal X-ray diffraction. homogeneous and heterogeneous catalysis. [16][17][18] Following our recently published work towards the complexation of lanthanide(III) nitrate salts with dimethyl pyridine-2,6-dicarboxylate, we were interested in the synthesis of a 2,6-bis [(3-methoxybenzylidene)hydrazine carbonyl]pyridine L ligand derived from dimethyl pyridine-2,6-dicarboxylate ligand. [19] In comparison with dimethyl pyridine-2,6-dicarboxylate ligand, the L ligand possesses more coordination sites that can bind and stabilize different lanthanide metal ions with high coordination numbers. Moreover it has flexible groups that can accommodate and protect lanthanide metal atoms from solvent molecules, which avoid non-radiative deactivation processes. [20] Moreover, L is efficient in the displacement of water molecules present in the coordination sphere of lanthanide ions that quenches the luminescence by absorption of the emitted radiation in the vibrational excitation processes via the vibrational levels of the O-H of water molecules. [21] This work reports the synthesis of the L ligand by a condensation reaction between 2-methoxybenzaldehyde and 2,6-bis(hydrazinocarbonyl)pyridine in ethanol and describes its crystal structure. Additionally the coordinating behavior of L with lanthanide metals (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Er) has been investigated by elemental analysis, conductivity measurements, spectral analysis (IR, NMR, UV-Vis and mass) and thermal studies.The antioxidant activity and photoluminescence properties of L and Ln-L have been investigated.

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Section: Resultsmentioning

confidence: 99%

Synthesis, density functional theory calculations and luminescence of lanthanide complexes with 2,6‐bis[(3‐methoxybenzylidene)hydrazinocarbonyl] pyridine Schiff base ligand

et al. 2017

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“…Due to the importance that Schiff base derivatives possess, several Schiff‐base units and their corresponding metal complexes were synthesized and thermodynamically studied 30 . These findings highlight the broad spectrum of therapeutic possibilities offered by Schiff bases, driving continued interest and investigation into their pharmacological potential 31,32 . Schiff bases that contain additional electron‐donating groups, such as N, O, and S are playing a crucial role in metallo‐biomolecules 10 .…”

Section: Introductionmentioning

confidence: 99%

“…30 These findings highlight the broad spectrum of therapeutic possibilities offered by Schiff bases, driving continued interest and investigation into their pharmacological potential. 31,32 Schiff bases that contain additional electron-donating groups, such as N, O, and S are playing a crucial role in metallo-biomolecules. 10 It has been found that the coordination of Schiff base ligands through heteroatoms with lanthanide ions or transition metals enhances the biological activity 33,34 as well as the optical properties of these ligands, which has been attributed to the ion pairs on these atoms.…”

Section: Introductionmentioning

confidence: 99%

Probing the variations of synthesis, antimicrobial activity, and optical properties of new lanthanide and transition metal complexes of salicylaldehyde‐dipropylenetriamine ligand

Ebqa'ai,

Reed,

Seni

et al. 2024

Applied Organom Chemis

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Due to their notable antimicrobial activity and optical properties, Schiff base ligands, along with their lanthanide and transition metal complexes, have seen extensive use in various applications. However, despite their potential, a comprehensive investigation into lanthanide and transition metal complexes using the same Schiff base ligand has not been reported to date. In this study, coordination compounds of lanthanide and transition metal ions were synthesized from the Schiff base ligand salicylaldehyde‐dipropylenetriamine. These complexes were characterized by elemental analysis, 1H and 13C NMR, mass spectroscopy, Fourier‐transform infrared spectroscopy ultraviolet–visible spectroscopy (UV–Vis), fluorescence spectroscopy, molar conductivity measurements, and thermogravimetric studies. Furthermore, the molecular structure of the Co (II) complex was determined by means of X‐ray crystallography. Thermogravimetric studies illustrated endothermic and non‐spontaneous degradation pathways of the complexes. UV–Vis spectra showed a new absorption band attributed to the ligand‐to‐metal charge transfer peak supporting the complexation between the ligand and metals. The lanthanide complexes exhibited distinctive luminescence emissions in the Sm (III), Tb (III), and Eu (III) complexes. This observation suggests that the ligand possesses the capability to absorb and efficiently transfer energy to the metal center of these lanthanide ions, thereby resulting in their characteristic luminescent properties. Additionally, antimicrobial investigations revealed that transition metal complexes generally exhibited antimicrobial activity against both gram‐positive and gram‐negative bacterial strains compared to lanthanide metal complexes, in most cases. However, it is noteworthy that the Dy (III) complex displayed the lowest minimum inhibitory concentration and minimum biocidal concentration values of 16 μg/ml against Staphylococcus epidermidis, indicating its potential as a candidate for the treatment of this pathogenic bacterium. The main purpose of this article is to investigate the variations in the synthesis and characterization of lanthanide and transition metal complexes utilizing the same Schiff base ligand suitable for applications in the pharmaceutical industry and optical material sciences.

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“…In continuation of our research on synthesis of Schiff base ligands and their lanthanide complexes [29][30][31][32][33][34], herein we have focused on synthesis, characterization and luminescent properties of a series of lanthanide complexes with H 2 L ligand. Their biological activity has been tested against some clinical important bacteria.…”

Section: Introductionmentioning

confidence: 99%

Lanthanide Complexes with N,N-Bis-(2-hydroxy-5-nitrobenzylidene)-1,2-phenylenediamine Schiff Base Ligand: Synthesis, Characterization, Photophysical Properties, and Biological Activity

et al. 2021

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A series of lanthanides(III) complexes containing Schiff base ligand, {[LnL(NO 3 ).H 2 O]•xH 2 O {Ln: La, Pr, Nd, Sm, Eu, Gd, Tb, and Dy, H 2 L: N,N-bis-(2-hydroxy-5-nitro-benzylidene)-1,2-phenylenediamine Schiff base ligand}, have been synthesized by reaction of the ligand with Ln(NO 3 ) 3 •xH 2 O in the presence of NaOH.Structures of these complexes have been characterized by elemental analysis, molar conductivity, thermal gravimetric and various spectral methods (IR, UV-Vis, 1 H, and 13 C NMR). The proposed formula, of the complexes consists of one Ln(III) ion with the coordination number of seven. Two coordination sites are occupied by one bi-dentate nitrate anion, another site is occupied by one water molecule and the remaining four coordination sites are occupied by one deprotonated tetra-dentate ligand molecule. Fluorescence emission spectra of Ln(III) complexes exhibit ligand-centred emission peak with a blue shift compared with that of free H 2 L. This can be explained on the basis of ligand-to-metal charge transfer (LMCT) that occurs upon L -2 coordination to Ln(III) ions. Antibacterial activity of H 2 L and its Ln(III) complexes has been tested against some gram-positive and gram-negative bacterial strains.

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Photophysical properties and computational study of newly synthesized lanthanide complexes with N-(2-carboxyphenyl)salicylideneimine Schiff base ligand

Cited by 13 publications

References 43 publications

Synthesis, density functional theory calculations and luminescence of lanthanide complexes with 2,6‐bis[(3‐methoxybenzylidene)hydrazinocarbonyl] pyridine Schiff base ligand

Synthesis, density functional theory calculations and luminescence of lanthanide complexes with 2,6‐bis[(3‐methoxybenzylidene)hydrazinocarbonyl] pyridine Schiff base ligand

Probing the variations of synthesis, antimicrobial activity, and optical properties of new lanthanide and transition metal complexes of salicylaldehyde‐dipropylenetriamine ligand

Lanthanide Complexes with N,N-Bis-(2-hydroxy-5-nitrobenzylidene)-1,2-phenylenediamine Schiff Base Ligand: Synthesis, Characterization, Photophysical Properties, and Biological Activity

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