Binuclear oxovanadium(IV), cerium(III) and dioxouranium(VI) nano complexes of a bis(bidentate) ligand: Synthesis, spectroscopic, thermal, DFT calculations and biological studies

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New mononuclear Fe (III), Cu (II), Ag (I), ZrO ( IV) and UO2(VI) complexes were synthesized by the reaction of metal ions with (E)‐3‐(2‐(5, 6‐ diphenyl‐1,2,4‐ triazin‐3‐ yl)hydrazono)butan‐2‐ one oxime. The structures of the metal complexes were characterized using analytical, spectral (infrared, electronic, 1H NMR, electron spin resonance (ESR), and mass), magnetic moment, molar conductance, thermal gravimetric analysis, and powder X‐ray diffraction (XRD) measurements. All complexes have octahedral geometries except the Cu (II) complex, which has square planar geometry, and the UO2(VI) complex, in which the coordination number is seven. The ligand acts as a (neutral, monoanionic or dianionic) tridentate with N2O coordinating sites: N‐azomethine, N‐triazine, and O‐oxime. Fluorescence spectral studies were carried out in solid state and in dimethylformamide (DMF). The kinetic parameters of the thermal decomposition stages were calculated using Coats–Redfern equations. The morphological structures of the ligand and some complexes were determined using XRD. The molecular orbital calculations were carried out for the ligand and metal complexes using the Hyperchem 7.52 program on the basis of the PM3 level. The antimicrobial activities of the ligand and its complexes were investigated towards the microorganisms S. aureus and B. subtilis as Gram‐positive bacteria, S. typhimurium and E. coli as Gram‐negative bacteria, C. albicans, and A. fumigatus. The ligand and its complexes showed antitumor activity against Hep G‐2 cell lines, where Cu (II) and Ag (I) complexes seem to be promising as they showed IC50 values that are lower than and comparable to that of the antitumor drug doxorubicin.

Section: Ir Spectramentioning

confidence: 99%

Synthesis, spectroscopic, biological, and theoretical studies of new complexes from (E)‐3‐(2‐(5, 6‐ diphenyl‐1,2,4‐ triazin‐3‐ yl)hydrazono)butan‐2‐ one oxime

Samy

2020

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“…[49,50] The (M&bond;O) and (M&bond;N) bands were observed as new bands in the ranges 551-553 and 458-463 cm −1 , respectively. [3,4,[51][52][53][54][55][56][57][58] Zeolite Y shows absorption bands at 1022, 791 and 463 cm −1 , which may be assigned to asymmetric stretching, symmetric stretching and bending frequencies, respectively, of the Al-O-Si framework. The bands at ca 3600-3200 and 1641 cm −1 may be related to the adsorbed surface hydroxyl groups (stretching and bending).…”

Section: Ft-ir Spectramentioning

confidence: 99%

New less toxic zeolite‐encapsulated Cu(II) complex nanomaterial for dual applications in biomedical field and wastewater remediation

Khalil

Kishk

EL-Mekkawi

et al. 2019

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A new dual‐functional Cu(II) complex and its nanohybrid form encapsulated into NaY zeolite cavities were synthesized. The synthesized compounds were characterized using elemental analyses, X‐ray fluorescence, infrared, 1H NMR, electronic, electron spin resonance and mass spectra, powder X‐ray diffraction, surface area and transmission electron microscopy in addition to conductivity and magnetic susceptibility measurements. The encapsulated Cu(II) complex was catalytically tested for degradation of industrial wastewater. The decolorization and mineralization results indicate that the Cu(II) complex encapsulated into zeolite host is an effective heterogeneous catalyst for real industrial wastewater remediation. In addition, both free and encapsulated Cu(II) complexes were tested as anti‐microbial and anti‐tumour agents. The results show that the Cu(II) complex encapsulated into zeolite has a high activity (IC50 = 14.4 μg ml−1). The results of in vivo toxicity experiments indicate that the Cu(II) complex encapsulated into zeolite is a less toxic biocompatible material (LD50 = 1245 mg kg−1). The catalytic properties, cytotoxicity and toxicity of the new nanohybrid Cu(II) complex encapsulated into zeolite make it a promising eco‐friendly and biocompatible material for water remediation and biomedical applications.

“…The spectra of the complexes show a broad band in the range 3396–3997 cm −1 which can be assigned to the stretching frequency of the (OH) group of alcohol molecules associated with the complexes, which is also confirmed by elemental and thermal analyses. Upon complexation, the ν(C&bond;O) phenolic of the free ligand at1147 cm −1 is shifted to lower wavenumbers ( ca 1122–1121 cm −1 ), confirming its participation in chelation . Similarly, a significant shift of (C&dbond;O) stretching vibration of carbonyl group to lower wavenumber in the spectra of the complex nanophosphors by 19 cm −1 relative to published value for H 2 L is observed, suggesting its chelation with metal ions.…”

Section: Resultsmentioning

confidence: 69%

“…Upon complexation, the ν(C&bond;O) phenolic of the free ligand at1147 cm −1 is shifted to lower wavenumbers ( ca 1122–1121 cm −1 ), confirming its participation in chelation . Similarly, a significant shift of (C&dbond;O) stretching vibration of carbonyl group to lower wavenumber in the spectra of the complex nanophosphors by 19 cm −1 relative to published value for H 2 L is observed, suggesting its chelation with metal ions. In addition, the participation of phenolic and carbonyl groups are evidenced with the appearance of new bands at 516–609 cm −1 , attributed to ν(M&bond;O) bands .…”

Section: Resultsmentioning

confidence: 69%

Novel bifunctional lanthanide‐centered nanophosphors for latent fingerprint detection and anti‐counterfeiting applications

Saif

Fouad

2019

Production of hybrid organic/inorganic complexes such as lanthanide phosphors in the nanodomain for human fingerprint visualization and anti‐counterfeiting ink under biocompatible UVA and blue light has not yet been studied that thoroughly. This paper presents the preparation of novel, bifunctional, green and red nanophosphors based on Eu3+ and Tb3+ complexes with quinolinone ligand (H2L). They have been prepared and characterized for latent fingerprint detection and anti‐counterfeiting ink applications. The analytical data confirm that the ligand acts in a monoanionic bidentate manner through OO donor sites, forming mononuclear complexes, formulated as [Ln(HL)3(C2H5OH)3] (Ln = Eu3+ or Tb3+; L = 1‐ethyl‐4‐hydroxy‐3‐(nitroacetyl)quinolin‐2‐(1H)‐one). The Eu3+ and Tb3+ complexes have nanospherical morphologies with average particle sizes of 17 and 5 nm, respectively. Pure red and green photoluminescence with long lifetime values has been obtained from the Eu3+ and Tb3+ complexes, respectively, under non‐harmful UVA and blue illumination. Latent fingerprint details, including their characteristic three levels, have been clearly identified from various forensic (non‐porous, semi‐porous, highly fluorescent porous) substrates using red (Eu3+) and green (Tb3+) nanophosphors. The green nanophosphor powder has a greater capability for visualizing latent fingerprints from highly fluorescent porous surfaces as compared to the red one. Both nanophosphor complexes have been used to develop luminescent ink for anti‐counterfeiting applications.