Spectral Study of Some Lanthanides Complexes with Quaternary Pyridinium Ligands

Cârâc, Andreea; Boscencu, Rica; Cârâc, Geta; Bungău, Simona

doi:10.37358/rc.17.10.5868

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…When interpreting the FTIR spectrum of Hyperici extract, vibrations are attributed considering those characteristics of hypericin, the main component in the extract. Hypericin being a bianthrone (an anthraquinone derivative), therefore, for the interpretation of the FTIR spectrum, the vibrations that appear in the FTIR spectra of anthraquinone are also considered [41][42][43][44].…”

Section: Atr Ftir Spectroscopymentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles Using Hypericum perforatum L. Extract and Evaluation of Their Antibacterial Activity

Gîtea¹,

Teodorescu²,

Pantiş³

et al. 2020

Rev. Chim.

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Silver nanoparticles (AgNPs) ranging in size from 1-100 nm show good application potential in many medical fields (therapies, medical devices, molecular diagnostics) due to their antimicrobial properties. The purpose of this study is to characterize from physicochemical perspective the colloidal dispersion obtained through phytosynthesis. The existence of colloidal silver particles was visually highlighted through Thyndall effect. The bioreduction of silver ions was analyzed through modern techniques, UV-VIS spectrophotometry and Hyperspectral Microscopy. After getting the colloidal dispersion, its antibacterial activity was proved by sowing on different plates the following types of pathogenic agents: Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa. The UV-VIS spectrum for the methanolic extract with 10% H. perforatum L. and for the silver colloidal dispersions was achieved, observing a max at 455 nm. The hyperspectral images were achieved observing the shape, conformation, and the size of the obtained particles. During the antibacterial efficacy testing on those three strains of pathological agents, in all situations, the colloidal dispersion had a promising antimicrobial effect.The term nanotechnology was used for the first time by Norio Taniguchi in 1974, and represents the set of technologies and researches, physical, chemical and biological at the scale of particles with size smaller than 100 nm [1][2][3]. Recently, the nanoparticles from noble metals have been the target of many researches concerning their unique electronic, optical, mechanical, magnetic and chemical properties. Their specific properties are different due to their dimension and the size of their specific surface [4][5][6]. They have applications in different fields: catalysing some reactions, in the electronic field, in photonics, in photography, in textile industry [7,8], in cosmetics industry [9], in dye industry, technical-medical products [10,11], in the diagnosis field [12], in the treatment of different acute and chronical severe diseases like malaria, hepatitis, cancer [13][14][15][16] and AIDS, and as vectors for some medicines [17,18].The antibacterial effect of silver ions has been known for a long time: in concentrations of 1:20.000.000 affect the thiol groups, precipitating the proteins and interfering the vital enzymatic processes of bacterial cells. But the use of AgNPs as antibacterial agent is relatively new. In comparison with the silver ions, the antimicrobial activity of the colloidal silver particles is influenced by the size of the particles, their size being inversely proportional with the antimicrobial effect, due to their increased reactivity determined by the big ratio surface to volume [19].A few preparation methods for the metallic nanoparticles were reported: reduction of some salts, radiolysis, electrochemical synthesis, laser ablation and thermal ablation. In order to get the AgNPs, the simplest method is the reduction of some silver salts -they produced nanoparticles with different morphologi...

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Section: Atr Ftir Spectroscopymentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles Using Hypericum perforatum L. Extract and Evaluation of Their Antibacterial Activity

Gîtea¹,

Teodorescu²,

Pantiş³

et al. 2020

Rev. Chim.

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“…Metals generally occupy an esteemed and precious place in medicine and medicinal chemistry [3]. In the last decade, lanthanide (III) coordination compounds have gained much attention due to their various uses and application in numerous fields such as fluorescent probes, sensors organic light emitting diodes, MRI agents, Laser materials, theragnostic molecular optoelectrical devices, biomarkers, therapeutic and therapy, antitumor and anti-HIV activities [4][5][6][7][8]. Thiosemicarbazones and thiosemicarbazides, their derivatives and their metal complexes are emerging as anticancer chemotherapeutic agents, showing remarkable inhibitory activity against cancer cells [9,10].…”

Section: Introductionmentioning

confidence: 99%

A Review on Synthesis, Lanthanide Complexes and Biological Activites of Hydrazone Derivatives of Hydrazinecarbothioamides

Amadi,

Ogwuegbu,

Enenebeaku

et al. 2023

IRJPAC

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Hydrazinecarbothioamides are important intermediates with biological activities in organic chemistry synthesis, especially in the synthesis of biologically active heterocyclic scaffolds and compounds. The uniqueness in of synthesis and a wild range of pharmaceutical, medicinal biological potentials and properties, their preferred application as building brick in and the synthesis of heterocyclic and other important organic compounds and nonlinear optical (NLO) materials have made them attractive derivatives of thiosemicarbazides in the recent years. In this review, a detailed account in terms of synthesis and applications of their hydrazone derivatives and their lanthanide complexes are presented .Further, the biological and analytical applications of newly reported ligands and their complexes are reported. The wide investigation of the lanthanide (III) coordination complexes with organic ligands are mainly due to their structures and strong potential biological and pharmacological properties of hydrazones as derivatives of hydrazinecarbothioamides possess sites that play important roles in the formation of heterocyclics and other biologically active scaffolds.

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“…As a result, the absorption spectra of lanthanide complexes are often sharp and line-like, in contrast to transition metal's broad absorption bands. The f-f bands' intensity is affected by the nature of the coordination sphere in a quantitative way [21].…”

Section: Introductionmentioning

confidence: 99%

Absorption spectral study for the interaction of Pr(III) with L-Aspartic acid in various aquated organic solvents through 4f-4f transition spectra: Analysis of reaction pathways and thermodynamic parameters

2022

pnr

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The interaction of Praseodymium (III) with L-Aspartic Acid has been analysed theoretically through 4f-4f transition in various aquated organic solvents (DMF, ACN, Dioxane and methanol). Spectral parameters such as: Energy interaction parameters like Slater-Condon (Fk's), Lande factor (ξ4f), Racah energy (Ek), nephelauxetic effect (β), bonding (b1/2) and percent covalency (δ), as well as intensity parameters: oscillator strength 'P' and Judd-Ofelt Tλ (λ=2,4,6) were evaluated. The degree of outer and inner sphere coordination, the level of metal 4f-4f orbital involvement in the complexation, defining the immediate coordination environment around the metal Pr(III), and the coordination number of the complex formed could be revealed through the analysis of these spectral parameters. The rate of complexation for Pr(III) with L-Aspartic acid and consequently its thermodynamic parameters have been evaluated through 4f-4f transition spectra.

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Spectral Study of Some Lanthanides Complexes with Quaternary Pyridinium Ligands

Cited by 6 publications

References 12 publications

Green Synthesis of Silver Nanoparticles Using Hypericum perforatum L. Extract and Evaluation of Their Antibacterial Activity

Green Synthesis of Silver Nanoparticles Using Hypericum perforatum L. Extract and Evaluation of Their Antibacterial Activity

A Review on Synthesis, Lanthanide Complexes and Biological Activites of Hydrazone Derivatives of Hydrazinecarbothioamides

Absorption spectral study for the interaction of Pr(III) with L-Aspartic acid in various aquated organic solvents through 4f-4f transition spectra: Analysis of reaction pathways and thermodynamic parameters

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