Dioxouranium complexes with pentadentate s-triazine Schiff base ligands: Synthesis, crystal structure and optical properties

Pavelek, Lubomír; Ladányi, Vít; Nečas, Marek; Vallová, Silvie; Wichterle, Kamil

doi:10.1016/j.poly.2016.01.014

Cited by 13 publications

(6 citation statements)

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“…On the other hand, the growing interest in s-triazine derivatives specially its chlorinated derivative (cyanuric chloride) and its efficient reaction with hydrazine to render mono-, di-, or tri-substituted hydrazino derivatives has increased [20][21][22]. Several prepared and well explored hydrazino-s-triazine derivatives were reported and considered with special interest in coordination chemistry and supramolecular chemistry [23,24] as well as their enormous potential in the field of material chemistry [25,26], complexation with large metal ions [27][28][29][30][31][32][33][34][35][36], and pharmaceutical industry [37][38][39][40][41][42][43]. 2…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Antimicrobial Studies of Novel Series of 2,4-Bis(hydrazino)-6-substituted-1,3,5-triazine and Their Schiff Base Derivatives

Al-Rasheed

Sholkamy

Alshaikh

et al. 2018

Journal of Chemistry

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The present work represents the synthesis, characterization, and antimicrobial studies of novel series of 2,4-bis(hydrazino)-6substituted-1,3,5-triazine and their Schiff base derivatives. IR, NMR ( 1 H and 13 C), elemental analysis, and LC-MS characterized the prepared compounds. The biological activity of the target products was evaluated as well. Twenty-two of the prepared compounds were selected according to their solubility in aqueous DMSO. Only eight compounds showed good activity against the selected pathogenic bacteria and did not show antagonistic effect against fungus Candida albicans. Two compounds k and g have widerange effect presently in Gram-positive and Gram-negative bacteria while other compounds ( f, i, m, d, i, and h) showed specific effect against the Gram-negative or Gram-positive bacteria. The minimum inhibitory concentration (MIC, g/mL) of f, i, k, and h compounds against Streptococcus mutans was 62.5 g/mL, 100 g/mL, 31.25 g/mL, and 31.25 g/mL, respectively. The MIC of m, k, d, g, and h compounds against Staphylococcus aureus was 62.5 g/mL, 31.25 g/mL, 31.25 g/mL, 100 g/mL, and 62.5 g/mL, respectively. The MIC of k, g, and i compounds against Salmonella typhimurium was 31.25 g/mL, 100 g/mL, and 62.5 g/mL, respectively. The MIC of i compound against Escherichia coli was 62.5 g/mL.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Antimicrobial Studies of Novel Series of 2,4-Bis(hydrazino)-6-substituted-1,3,5-triazine and Their Schiff Base Derivatives

Al-Rasheed

Sholkamy

Alshaikh

et al. 2018

Journal of Chemistry

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“…S1). The multi‐dentate ligands (H 2 L 1 and H 2 L 2 ) were then prepared by the Schiff base condensation reaction of one equivalent 2,4‐dihydrazinyl‐6‐methoxy‐1,3,5‐triazine and two equivalents of 3‐methoxy salicylaldehyde or 3‐ethoxysalicylaldehyde. The structures of the ligands were characterized by 1 H‐ 13 C NMR, FT‐IR and elemental analysis.…”

Section: Resultsmentioning

confidence: 99%

“…The compound ( c ) was prepared according to the reported procedure . 2,4‐dichloro‐6‐methoxy‐1,3,5‐triazine (6.13 mmol) was suspended in THF (20–25 mL) and stirred for 10 min at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…The compound was prepared according to the reported procedure. [30] NaHCO 3 (Sodium bicarbonate) (77.38 mmol) was dissolved in MeOH (100 ml). In an ice bath, the solution was cooled to 0-10°C.…”

Section: Synthesis Of 24-dichloro-6-methoxy-135-triazine (B)mentioning

confidence: 99%

“…The compound (c) was prepared according to the reported procedure. [30] 2,4-dichloro-6-methoxy-1,3,5triazine (6.13 mmol) was suspended in THF (20-25 mL) and stirred for 10 min at room temperature. Hydrazine hydrate (25 mmol) was added and the reaction solution was stirred at 70°C for 12 hr.…”

Section: Synthesis Of 24-dihydrazinyl-6-methoxy-135-triazine (C)mentioning

confidence: 99%

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Triazine based Mn (II) and Mn (II)/Ln (III) complexes: Synthesis, characterization and catecholase activities

Çelik

Köse

2018

Applied Organom Chemis

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In the current work, two triazine‐based multidentate ligands (H2L1 and H2L2) and their homo‐dinuclear Mn (II), mononuclear Ln (III) and hetero‐dinuclear Mn (II)/Ln (III) (Where Ln: Eu or La) complexes were synthesized and characterized by spectroscopic and analytical methods. Single crystals of a homo‐dinuclear Mn (II) complex {[Mn (HL1)(CH3OH)](ClO4·CH3OH}2 (1) were obtained and the molecular structure was determined by X‐ray diffraction method. In the structure of the complex, each Mn (II) ion is seven‐coordinate and one of the phenolic oxygen bridges two Mn (II) centre forming a dimeric structure. The UV–Vis. and photoluminescence properties of synthesized ligands and their metal complexes were investigated in DMF solution and the compounds showed emission bands in the UV–Vis. region. The catecholase enzyme‐like activity of the complexes were studied for 3,5‐DTBC → 3,5‐DTBQ conversion in the presence of air oxygen. Homo‐dinuclear Mn (II) complexes (1 and 4) were found to efficiently catalyse 3,5‐DTBC → 3,5‐DTBQ conversion with the turnover numbers of 37.25 and 35.78 h−1 (kcat), respectively. Mononuclear Eu (III) and La (III) complexes did not show catecholase activity.

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Di‐μ‐acetato Diuranyl(VI) Complexes with N‐(2‐pyridyl)‐N′‐(5‐R‐salicylidene)hydrazines: Syntheses, Structures, Properties and Extraction Studies

et al. 2018

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Reactions of equimolar amounts of UO2(OAc)2⋅2H2O and N‐(2‐pyridyl)‐N′‐(5‐R‐salicylidene)hydrazines (HLn; n=1–3 for R = H, Me, and OMe, respectively) in methanol produced [(UO2)2(μ‐OAc)2(Ln)2] (1‐3 for n=1–3) in ∼70% yields. Elemental analysis, various spectroscopic, and electrochemical measurements were used to characterize 1‐3. X‐ray crystal structures revealed an 8‐membered U(OCO)2U ring with a chair conformation and pentagonal‐bipyramidal UN2O5 coordination spheres in each of 1‐3. The N,N,O‐donor (Ln)‐ and the two O‐atoms of the two bridging (OAc)‐ form the pentagonal plane around the U‐atom of trans‐(UO2)2+. Intermolecular H‐bonding assisted self‐assembly of the complexes lead to 1‐ and 2‐dimensional supramolecular structures. Infrared (IR) and proton nuclear magnetic resonance (1H NMR) spectra of 1‐3 are consistent with their molecular structures. The electronic spectra showed four strong absorption bands in the range 466‐288 nm. The complexes undergo two irreversible reductions near ‐0.65 and ‐0.88 V (vs. Ag/AgCl). Time‐dependent density functional theory (TD‐DFT) calculations suggest that a ligand centered transition causes the highest energy absorption band, while, the remaining three are ligand‐to‐metal charge transfer (LMCT) bands and the two successive reductions are due to U(VI)‐U(VI) → U(V)‐U(VI) → U(V)‐U(V) processes. A maximum extraction of 98% of trans‐(UO2)2+ from the aqueous layer was observed in two‐phase extraction studies.

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Dioxouranium complexes with pentadentate s-triazine Schiff base ligands: Synthesis, crystal structure and optical properties

Cited by 13 publications

References 40 publications

Synthesis, Characterization, and Antimicrobial Studies of Novel Series of 2,4-Bis(hydrazino)-6-substituted-1,3,5-triazine and Their Schiff Base Derivatives

Synthesis, Characterization, and Antimicrobial Studies of Novel Series of 2,4-Bis(hydrazino)-6-substituted-1,3,5-triazine and Their Schiff Base Derivatives

Triazine based Mn (II) and Mn (II)/Ln (III) complexes: Synthesis, characterization and catecholase activities

Di‐μ‐acetato Diuranyl(VI) Complexes with N‐(2‐pyridyl)‐N′‐(5‐R‐salicylidene)hydrazines: Syntheses, Structures, Properties and Extraction Studies

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