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• W3136149126 endingPage "130295" @default.
• W3136149126 startingPage "130295" @default.
• W3136149126 abstract "• VO 2+ , ZrO 2+ and Zn 2+ -complexes were synthesized from the asymmetrical tetradentate imine ligand. • The catalytic differentiation between VO 2+ -complex and the new ZrO 2+ - and Zn 2+ -complexes was studied in the 1,2-cyclohexene (ep)oxidation. • Various parameters were investigated (temperature, time, solvent, oxidant type and catalyst amount), with theoretical evaluation of the mechanism. • Some cyclic and acyclic alkenes were studied in (ep)oxidation reactions. • The catalytic reactivity VO-, ZrO- and Zn-complexes was tested in the 2-aminothiophene oxidation by H 2 O 2 with detection of the most chemoselectives. Three mononuclear di-valent VO 2+ , ZrO 2+ and Zn 2+ -complexes (VOL, ZrOL and ZnL, respectively) were prepared from asymmetrical di-basic tetradentate di-imine ligand (6,6′-((1 E ,1′ E )-((4-chloro-1,2-phenylene)bis(azaneylylidene))bis(methaneylylidene))bis(2-ethoxy phenol, H 2 L). To confirm the M-complexes compositions, various spectral tools (FT-IR, EI/M and UV-Vis. spectra), molar conductance, thermal, elemental analysis and pXRD analyses were accomplished. Distorted octahedral geometry was confirmed for ZnL and square pyramidal geometry was elucidated for VOL and ZrOL. Their catalytic efficiency was investigated in the epoxidation of 1,2-cyclohexene by H 2 O 2 . They exhibited moderate to excellent catalytic control. The effect of temperature, time, solvent, type of oxidant and amount of catalysts were studied in order to determine the optimal catalytic atmosphere. The catalysts screening for epoxidation of alternative cyclic and acyclic olefins at optimization was reported. The variation of central metal ions from high to low valents (Zr 4+ , V 4+ and Zn 2+ ions) and their capability for oxidation control their catalytic potential are the most effective aspects in the epoxidation reaction. The catalytic oxidation of 2-aminothiophene within VOL, ZrOL and ZnL, as a first trial, by H 2 O 2 was examined. Also, QSAR parameters and DFT studies were performed to predict the catalytic properties of VOL, ZrOL and ZnL, to assert on chosen application. Effective surface properties of VO(II) complex were promoted for progressing its catalytic activity, which already happened. The catalytic mechanism was supported by the sequenced stability difference between proposed intermediates based on the difference in their recorded formation energy from the DFT study." @default.
• W3136149126 created "2021-03-29" @default.
• W3136149126 creator A5022247649 @default.
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• W3136149126 date "2021-07-01" @default.
• W3136149126 modified "2023-09-24" @default.
• W3136149126 title "Enhanced catalytic (ep)oxidation of olefins by VO(II), ZrO(II) and Zn(II)-imine complexes; extensive characterization supported by DFT studies" @default.
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• W3136149126 doi "https://doi.org/10.1016/j.molstruc.2021.130295" @default.
• W3136149126 hasPublicationYear "2021" @default.
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