Facile synthetic route of TiO2–ZnO heteronanostructure coated by oxovanadium (IV) bis-Schiff base complex as a potential effective homogeneous/heterogeneous catalysts for alcohols redox systems

Adam, Mohamed Shaker S.; Khalil, Ahmed; Taha, Amel; Mostafa, Mostafa M; Makhlouf, M.M.; Mahmoud, Hatem A.

doi:10.1016/j.surfin.2023.102914

Cited by 6 publications

(1 citation statement)

References 78 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although GOase and a significant portion of its bioinspired metal complexes usually have their catalytic activity evaluated in homogenous media, the development of heterogeneous catalysts employed in BnOH oxidation has been described. Inorganic platforms such as zeolites [ 15 ], noble metal nanoparticles [ 16 , 17 , 18 ], amorphous and mesoporous SiO 2 [ 19 ], copper(II) dopped phyllosilicates [ 20 ], alkali-earth metal oxide [ 21 ], Al 2 O 3 [ 22 ] and transition metal oxides [ 23 , 24 , 25 ] have been used in catalytic studies. Another particularly interesting material used to anchor catalysts is SiO 2 -coated magnetic Fe 3 O 4 nanoparticles [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Homo- and Heterogeneous Benzyl Alcohol Catalytic Oxidation Promoted by Mononuclear Copper(II) Complexes: The Influence of the Ligand upon Product Conversion

Chimilouski,

Slominski,

Tillmann

et al. 2024

Molecules

View full text Add to dashboard Cite

The catalytic properties of three copper complexes, [Cu(en)2](ClO4)2 (1), [Cu(amp)2](ClO4)2, (2) and [Cu(bpy)2](ClO4)2 (3) (where en = ethylenediamine, amp = 2-aminomethylpyridine and bpy = 2,2′-bipyridine), were explored upon the oxidation of benzyl alcohol (BnOH). Maximized conversions of the substrates to their respective products were obtained using a multivariate analysis approach, a powerful tool that allowed multiple variables to be optimized simultaneously, thus creating a more economical, fast and effective technique. Considering the studies in a fluid solution (homogeneous), all complexes strongly depended on the amount of the oxidizing agent (H2O2), followed by the catalyst load. In contrast, time seemed to be statistically less relevant for complexes 1 and 3 and not relevant for 2. All complexes showed high selectivity in their optimized conditions, and only benzaldehyde (BA) was obtained as a viable product. Quantitatively, the catalytic activity observed was 3 > 2 > 1, which is related to the π-acceptor character of the ligands employed in the study. Density functional theory (DFT) studies could corroborate this feature by correlating the geometric index for square pyramid Cu(II)-OOH species, which should be generated in the solution during the catalytic process. Complex 3 was successfully immobilized in silica-coated magnetic nanoparticles (Fe3O4@SiO2), and its oxidative activity was evaluated through heterogenous catalysis assays. Substrate conversion promoted by 3-Fe3O4@SiO2 generated only BA as a viable product, and the supported catalyst’s recyclability was proven. Reduced catalytic conversions in the presence of the radical scavenger (2,2,6,6-tetrametil-piperidi-1-nil)oxil (TEMPO) indicate that radical and non-radical mechanisms are involved.

show abstract

Section: Introductionmentioning

confidence: 99%

Homo- and Heterogeneous Benzyl Alcohol Catalytic Oxidation Promoted by Mononuclear Copper(II) Complexes: The Influence of the Ligand upon Product Conversion

Chimilouski,

Slominski,

Tillmann

et al. 2024

Molecules

View full text Add to dashboard Cite

show abstract

Complexation behavior of copper and zinc divalent ions towards diisatin malonyl dihydrazone ligand with biological and catalytic assessments

Adam,

Alghanim,

Abualreish

et al. 2024

Applied Organom Chemis

Self Cite

View full text Add to dashboard Cite

According to the interesting reactivity of arylhydrazones in coordination chemistry and biological assays, malonyl dihydrazone ligand of diisatin derivative (H2Lm) was reacted with Cu2+ and Zn2+ ions forming two complexes of dinuclear homoleptic mode (CuLm and ZnLm, respectively). Demonstration of their chemical structures was confirmed through various spectroscopic ways alongside the elemental analyses (EA), conductivity measurements, and magnetic characteristics.Their bio‐performance was recorded based on their inhibited potential of the growing ability of some common bacteria, fungi, and human cancer/normal cell lines. The biological studies appointed the role and job of M2+ ion = Cu2+ or Zn2+ in its chelated MLm complex to perform the bio‐reactivity over the free ligand, H2Lm. Moreover, their interacted modes with ctDNA (i.e., calf thymus DNA) were examined via the viscometry and spectrophotometric titration. Because the two chelates (CuLm and ZnLm) represented an attractive job for the inhibited action against the current microorganisms and the human cancer/normal strains' growth over the free H2Lm ligand, CuLm and ZnLm complexes displayed a distinguished interaction with ctDNA more than that of their uncoordinated H2Lm ligand. From the values of binding constant (Kb) and Gibb's free energy ( ), CuLm assigned more bio‐action within ctDNA more than ZnLm H2Lm ligand, referring to the role of Cu2+ ion with more electronegativity to enhance the reactivity of CuLm over their free H2Lm ligand and ZnLm.The catalytic behavior of CuLm and ZnLm was given within the epoxidation of 1,2‐cyclohexene (an example of unsaturated hydrocarbons) homogeneously using hydrogen peroxide (the oxidant). Their catalytic action was optimized through various temperatures, solvents, time, and type of M2+ ion in the catalyst.

show abstract

Immobilized transition metal (II) bis–imine chelate on ZnO@TiO₂ nanoparticles as sufficient catalysts for alcohol oxidation and for α,β‐cinnamic acid decarboxylative bromination

Adam,

Taha,

Hereba

et al. 2024

Applied Organom Chemis

Self Cite

View full text Add to dashboard Cite

Based on the strong coordination ability of substituted imines towards transition metals of different oxidation states, the coordination of the HL imine ligand with the Cu2+ ion to form the Cu–bis–imine complex was achieved in 2:1 molar ratios. Their structures were confirmed with various spectroscopic tools. Heterogeneously, CuL2 was successfully appended on ZnO@TiO2 nanoparticles, as the less harmful materials, within the deprotonated p‐hydroxy chain of the bonded ligand in CuL2. The surface and internal structural morphologies of ZnO@TiO2@CuL2 were analyzed using X‐ray diffraction (XRD), field‐emission scanning electron microscopy (FESEM), high‐resolution transmission electron microscopy (HRTEM), energy‐dispersive X‐ray spectroscopy (EDS), and infrared (IR) spectroscopy, in addition to thermogravimetric analysis (TGA). The catalytic behavior of both catalysts, CuL2 (the homogeneous catalyst) and ZnO@TiO2@CuL2 (the heterogeneous catalyst), was examined in the benzyl alcohol redox protocols using H2O2 for their optimization. α,β‐Cinnamic acid decarboxylative bromination in the presence of potassium bromide and H2O2 in water was studied with both catalysts, in which (2‐bromovinyl)benzene was the chemoselective product. Both Cu catalysts displayed appreciable catalytic effectiveness for the oxidation protocols and the decarboxylative bromination reactions. CuL2 recorded less required time for optimization than that of the heterogeneous catalyst. The catalytic effectiveness of CuL2 was less promoted than that of ZnO@TiO2@CuL2. Despite the less performance in yield of benzaldehyde for the oxidation protocols with ZnO@TiO2@CuL2, ZnO@TiO2@CuL2 had more recycling than its homogeneous counterpart, with seven to three times, respectively.

show abstract

Facile synthetic route of TiO2–ZnO heteronanostructure coated by oxovanadium (IV) bis-Schiff base complex as a potential effective homogeneous/heterogeneous catalysts for alcohols redox systems

Cited by 6 publications

References 78 publications

Homo- and Heterogeneous Benzyl Alcohol Catalytic Oxidation Promoted by Mononuclear Copper(II) Complexes: The Influence of the Ligand upon Product Conversion

Homo- and Heterogeneous Benzyl Alcohol Catalytic Oxidation Promoted by Mononuclear Copper(II) Complexes: The Influence of the Ligand upon Product Conversion

Complexation behavior of copper and zinc divalent ions towards diisatin malonyl dihydrazone ligand with biological and catalytic assessments

Immobilized transition metal (II) bis–imine chelate on ZnO@TiO₂ nanoparticles as sufficient catalysts for alcohol oxidation and for α,β‐cinnamic acid decarboxylative bromination

Contact Info

Product

Resources

About

Facile synthetic route of TiO2–ZnO heteronanostructure coated by oxovanadium (IV) bis-Schiff base complex as a potential effective homogeneous/heterogeneous catalysts for alcohols redox systems

Cited by 6 publications

References 78 publications

Homo- and Heterogeneous Benzyl Alcohol Catalytic Oxidation Promoted by Mononuclear Copper(II) Complexes: The Influence of the Ligand upon Product Conversion

Homo- and Heterogeneous Benzyl Alcohol Catalytic Oxidation Promoted by Mononuclear Copper(II) Complexes: The Influence of the Ligand upon Product Conversion

Complexation behavior of copper and zinc divalent ions towards diisatin malonyl dihydrazone ligand with biological and catalytic assessments

Immobilized transition metal (II) bis–imine chelate on ZnO@TiO2 nanoparticles as sufficient catalysts for alcohol oxidation and for α,β‐cinnamic acid decarboxylative bromination

Contact Info

Product

Resources

About

Immobilized transition metal (II) bis–imine chelate on ZnO@TiO₂ nanoparticles as sufficient catalysts for alcohol oxidation and for α,β‐cinnamic acid decarboxylative bromination