A new nano-structured Ni(II) Schiff base complex: synthesis, characterization, optical band gaps, and biological activity

Rashad, M.M.; Hassan, Ali M.; Nassar, A. M.; Ibrahim, Nabila M.; Mourtada, A.

doi:10.1007/s00339-014-8448-6

Cited by 58 publications

(24 citation statements)

References 52 publications

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“…The band gap energy (E g ) of product compounds was calculated from Tauc's equations (Mott and Davis, 1979;Rashad et al, 2013). Copper specimen was of chemical compositions (wt%) depicted in Table 1.…”

Section: Materials and Physical Methodsmentioning

confidence: 99%

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Copper(II)-oxaloyldihydrazone complexes: Physico-chemical studies: Energy band gap and inhibition evaluation of free oxaloyldihydrazones toward the corrosion of copper metal in acidic medium

Ahmed

Hassan

Gumaa

et al. 2019

Arabian Journal of Chemistry

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A series of oxaloyldihydrazone ligands were prepared essentially by the conventional condensation reaction between oxaloyldihydrazide and different aldehydes e.g., salicylaldehyde, 2-hydroxy-1-naphthaldehyde, 2-hydroxyacetophenone and 2-methoxybenzaldehyde in 1:2 M ratio. The synthesized compounds were purified to give bis(salicylaldehyde)oxaloyldihydrazone (L 1 ), bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone (L 2 ), bis(2-hydroxyacetophenone)oxaloyldihy drazone (L 3 ) and bis(2-methoxybenzaldehyde)oxaloyldihydrazone (L 4 ). All the oxaloyldihydrazones (L 1 -L 4 ) and their relevant solid copper(II) complexes have been isolated and characterized by various physicochemical techniques. The identity of the synthesized compounds has been ascertained on the basis of elemental analyses, spectral (UV-Vis, IR, ESR, mass, 1 H NMR), magnetism and thermal (TG) measurements. The dihydrazones coordinate to the metal center forming binuclear complexes. Upon chelation, the metal center can form a trigonal distorted octahedral structure with L 1 and pseudo tetrahedral configuration with L 2 & L 3 & L 4 . The optical band gap energy for all compounds underlies the range of semiconductor materials. The investigated ligands were assayed for their corrosion inhibitive and adsorptive properties on copper surface in 1 M HCl solution using weight loss technique. The results pointed out that, the ligands have a plausible inhibition toward the corrosion of copper specimen. The adsorption reaction on copper surface was found to be spontaneous first

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Section: Materials and Physical Methodsmentioning

confidence: 99%

“…To clarify the conductivity of the isolated complexes, the optical band gap energy (E g ) of oxaloyldihydrazones and their Cu(II) complexes have been calculated from the following equations (Mott and Davis, 1979;Rashad et al, 2013;Hassan et al, 2015):…”

Section: Optical Propertiesmentioning

confidence: 99%

Copper(II)-oxaloyldihydrazone complexes: Physico-chemical studies: Energy band gap and inhibition evaluation of free oxaloyldihydrazones toward the corrosion of copper metal in acidic medium

Ahmed

Hassan

Gumaa

et al. 2019

Arabian Journal of Chemistry

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“…The optical band gap or energy of the band gap is calculated for all samples utilizing Tauc's equation, αhν = A(hν − E g ) n , [25,26] where n is equal to 2 and 1/2 for direct and indirect transitions respectively, α is the absorption coefficient. A is an energy independent constant.…”

Section: Microstructurementioning

confidence: 99%

Structure evaluation of bismuth telluride (Bi₂Te₃) nanoparticles with enhanced Seebeck coefficient and low thermal conductivity

Rashad

El‐Dissouky

Soliman

et al. 2017

Materials Research Innovations

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Bismuth telluride (Bi 2 Te 3 ) nanoparticles with different morphologies were synthesized using solvothermal process. The composition, the size and the micro-structure of the synthesized nanoparticles were investigated using X-ray diffraction (XRD) and scanning electron microscope (SEM). Band gap energy was determined using UV-vis spectrometer. The absorption peaks were shifted from 278 to 284 nm which confirm that the effect of the size and the nanostructure morphology. Moreover, the direct band gap (E g ) of ST-Bi 2 Te 3 , STEd-Bi 2 Te 3 , STNaEd-Bi 2 Te 3 , STPv-Bi 2 Te 3 and STNaPv-Bi 2 Te 3 were equal to 3.95, 4.7, 4.8, 4.7 and 4.5 eV. Thermal and electrical conductivity of the prepared nanoparticles were also investigated at room temperature. Plainly, thermal conductivity measurement concludes that thermal conductivity of ST-Bi 2 Te 3 sample prepared without any additives was high. The study revealed that, the addition of NaOH to the reaction medium as an alkali modifier has a great effect on the morphology and the size of the produced nanoparticles. The additions of PVP in absence and in presence of NaOH strongly affect the size and the morphology of the product. The effect of changing the morphology and the particle size were determined on the band gap energy and the Seebeck coefficient of the prepared samples and the negative sign of all Seebeck coefficients indicate n-type semiconductor.

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“…It is observed that optical absorbance increased with the increase in Ni doping. Being a 3d atom, Ni doping generate new absorption peak which is due to d → d transition [67][68][69] and increase in absorption intensity is due to increase in crystallite size from 1 to 5% (N2-N4) of doping because absorption increases with the increase in crystallite size [70].…”

Section: = K Cosmentioning

confidence: 99%

Tailoring structural and optical properties of ZrO2 with nickel doping

et al. 2020

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Pure and nickel doped zirconium oxide (ZrO 2) samples namely N1, N2, N3, N4 have been synthesized by sol-gel method at different doping concentrations (0, 1, 3 and 5 molar percentage respectively). Energy dispersive X-ray spectroscopy (EDS) was used to confirm the elemental composition of samples. X-ray diffraction data following Rietveld refinement revealed the stabilization of tetragonal phase with some impurity of monoclinic phase. Unit cell volume and tetragonality (c/a) ratio was found to be in good agreement with standard values. Results showed the increase in unit cell volume with the decrease in crystallite size. UV-visible spectroscopy, revealed the variation in optical band gap with increase in Ni dopant in ZrO 2 nano-crystals due to combined effect of quantum confinement and generation of interstitial sites.

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A new nano-structured Ni(II) Schiff base complex: synthesis, characterization, optical band gaps, and biological activity

Cited by 58 publications

References 52 publications

Copper(II)-oxaloyldihydrazone complexes: Physico-chemical studies: Energy band gap and inhibition evaluation of free oxaloyldihydrazones toward the corrosion of copper metal in acidic medium

Copper(II)-oxaloyldihydrazone complexes: Physico-chemical studies: Energy band gap and inhibition evaluation of free oxaloyldihydrazones toward the corrosion of copper metal in acidic medium

Structure evaluation of bismuth telluride (Bi₂Te₃) nanoparticles with enhanced Seebeck coefficient and low thermal conductivity

Tailoring structural and optical properties of ZrO2 with nickel doping

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A new nano-structured Ni(II) Schiff base complex: synthesis, characterization, optical band gaps, and biological activity

Cited by 58 publications

References 52 publications

Copper(II)-oxaloyldihydrazone complexes: Physico-chemical studies: Energy band gap and inhibition evaluation of free oxaloyldihydrazones toward the corrosion of copper metal in acidic medium

Copper(II)-oxaloyldihydrazone complexes: Physico-chemical studies: Energy band gap and inhibition evaluation of free oxaloyldihydrazones toward the corrosion of copper metal in acidic medium

Structure evaluation of bismuth telluride (Bi2Te3) nanoparticles with enhanced Seebeck coefficient and low thermal conductivity

Tailoring structural and optical properties of ZrO2 with nickel doping

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Product

Resources

About

Structure evaluation of bismuth telluride (Bi₂Te₃) nanoparticles with enhanced Seebeck coefficient and low thermal conductivity