32065-17-1Relevant articles and documents
Structural Information from ENDOR Spectroscopy: The Frozen Solution Proton Spetra of Some VO(II) Complexes
Attanasio, Donato
, p. 4952 - 4957 (1986)
The frozen solution proton ENDOR spectra of an extensive series of vanadyl Schiff base complexes have been measured at ca. 100 K.The experimental couplings have been assigned to specific protons by means of chemical substitution.The principal values of th
Heterogeneous catalysts hold the edge over homogeneous systems: Zeolite-Y encapsulated complexes for Baeyer-Villiger oxidation of cyclohexanone
Mehta, Jignasu P.,Parmar, Digvijaysinh K.,Godhani, Dinesh R.,Nakum, Haresh D.,Desai, Nisheeth C.
, p. 178 - 188 (2016/07/06)
A series of heterogeneous catalysts [M(pamp)]-Y (Where, M = V, Mn, Fe or Cu; pamp = 2,2′-((1E,1′E)-(1,2-phenylenebis(azanylylidene))bis(methanylylidene))diphenol) was prepared by encapsulation of metal complexes within zeolite-Y. Synthesized materials were characterized by chemical, BET and thermogravimetric (TG) analysis, X-ray diffraction (XRD), UV-vis and infrared spectroscopies, and scanning electron microscopy (SEM). Zeolite-Y encapsulated complexes were tested in Baeyer-Villiger (B-V) oxidation of cyclohexanone beside neat complexes to check the aptitude of heterogeneous catalysis over the homogeneous system. The effect of experimental variables viz., solvents, catalysts amount, the mole ratio of substrate to an oxidant, temperature and reaction time on substrate conversion was also tested. Under the optimized reaction conditions, [VO(pamp)]-Y was found to be a potential candidate by providing 1500 TONs in cyclohexanone oxidation, and the selectivity towards ?-caprolactone was 85.2%.
Schiff base ligands and their transition metal complexes in the mixtures of ionic liquid + organic solvent: A thermodynamic study
Shekaari, Hemayat,Kazempour, Amir,Khoshalhan, Maryam
, p. 2179 - 2191 (2015/02/19)
Schiff bases and their metal complexes in the mixtures of ionic liquid (IL) + organic solvent have shown great potential in attractive oxidation catalytic processes. The efficiency of such a process is strongly dependent on the various molecular interactions occurring between components. Thermodynamic properties of these systems can provide valuable information about structural interactions. Therefore, in this work, the interactions of the IL 1-hexyl-3-methylimidazolium chloride ([HMIm]Cl) with Schiff bases in organic solvents were studied through the measurements of density, viscosity, and electrical conductivity. The effect of solvent on the interactions was examined by the solutions of IL + BPIC Schiff base + solvent (C2H6O-C3H8O-C4H10O). Moreover, the influence of Schiff base ligand and Schiff base complex structures was probed by the solutions of IL + DMA + ligand (salcn/salpr/salen) and IL + DMA + complex (VO(3-OMe-salen)/VO(salophen)/VO(salen)), respectively. Using the experimental data, some important thermodynamic properties, such as standard partial molar volume (Vf,IL0), experimental slope (Sv), viscosity B-coefficient, solvation number (B/Vf,IL0), and limiting molar conductivity (Λ0) were calculated and discussed in terms of solute-solvent (IL-DMF/alcohol) and solute-cosolute (IL-Schiff base) interactions.