1986-89-6Relevant academic research and scientific papers
Synthesis, X-ray structure, DFT studies, and catalytic activity of a vanadium(V) complex containing a tridentate Schiff base
Amini, Mojtaba,Arab, Ali,Soleyman, Rouhollah,Ellern, Arkady,Woo, L. Keith
, p. 3770 - 3781 (2013)
Reactions of a solution of NH4VO3 in H 2O2 and water and salicylidene benzoyl hydrazine as a tridentate Schiff base (ONO) afford a six-coordinate V(V) complex [VO(ONO)(OCH3)(CH3OH)] with a distorted octahedral configuration. The complexes [VO(ONO)(OCH3)(CH3OH)] were isolated as air-stable crystalline solids and fully characterized, including by single-crystal X-ray structure analysis. DFT calculations have been performed to understand the electronic structure of the complex. Vibrational frequencies and maximum absorption wavelengths of the complex theoretically calculated are in good agreement with experimental values. [VO(ONO)(OCH3)(CH 3OH)] shows efficient oxidation of sulfides to their corresponding sulfoxides using urea hydrogen peroxide as the oxidant at room temperature under air.
Oxidation of sulfides with urea-hydrogen peroxide catalyzed by iron-salen complexes
Bagherzadeh, Mojtaba,Zare, Maryam
, p. 335 - 343 (2011)
The oxidation of sulfides to sulfoxides with hydrogen peroxide in good yield and high selectivity has been catalyzed very effectively by a series of Schiff base salen-type iron complexes in a monophasic medium (CH 2Cl2/CH3OH) at ambient temperature. The results of the present study show that the reaction rate strongly depends on both catalyst steric effects and steric and electronic properties of sulfides. In the system, the electronic spectral studies are applied to explain the formation of a reactive (salen) Fe=O intermediate.
Polysiloxane-supported fullerene derivative as a new heterogeneous sensitiser for the selective photooxidation of sulfides to sulfoxides by 1O2
Latassa, Daniel,Enger, Olivier,Thilgen, Carlo,Habicher, Tilo,Offermanns, Heribert,Diederich, Francois
, p. 1993 - 1995 (2002)
A heterogeneous photosensitiser for the generation of singlet oxygen was synthesized by covalent attachment of a methanofullerene derivative to polysiloxane-based Deloxan DAP beads and its performance in the photooxidation of sulfides to sulfoxides was investigated. As opposed to C60 and many of its derivatives, the heterogeneous sensitiser can be readily used in protic solvents such as methanol which makes the photooxygenation highly selective, affording good to excellent yields of sulfoxides with aliphatic and benzylic sulfides. Moreover, the sensitiser is easily recovered at the end of the reaction by simple filtration.
Nanoparticle supported, magnetically separable vanadium complex as catalyst for selective oxidation of sulfides
Bagherzadeh, Mojtaba,Haghdoost, Mohammad Mehdi,Shahbazirad, Ayoob
, p. 591 - 601 (2012)
A magnetically recyclable vanadium(V) catalyst was synthesized by covalent anchoring of VO(salen)Cl on silica-coated Fe3O4 nanoparticles. This straightforward preparation yields magnetically separable Fe3O4@SiO2@VO(salen) nanoparticles with high vanadium loading. These nanoparticles were efficient catalysts for selective oxidation of sulfides to corresponding sulfoxides with urea hydrogen peroxide in excellent yields. Leaching and recycling experiments revealed that the nanocatalyst can be applied for nearly complete oxidation of sulfides for at least five successive cycles.
Synthesis, x-ray studies, and catalytic activity of tridentate schiff base dioxo-molybdenum(VI)
Amini, Mojtaba,Khaksar, Mostafa,Boghaei, Davar M.,Bagherzadeh, Mojtaba,Ellern, Arkady,Keith Woo
, p. 2435 - 2444 (2014)
The reaction of a solution of MoO2(acac)2 in CH3OH and salicylidene 2-picoloyl hydrazone as a tridentate ONO donor Schiff base (ONO) afford a six-coordinated Mo(VI) complex [MoO2(ONO) (CH3OH)], with a distorted octahedral configuration. [MoO2(ONO)(CH3OH)] was isolated as an airstable crystalline solid and fully characterized by single-crystal X-ray structure analysis. [MoO2(ONO)(CH3OH)] shows reactivity in the oxidation of sulfides to their corresponding sulfoxides using urea hydrogen peroxide as the oxidant at room temperature under air.
A novel 12-molybdovanadate nanocluster: Synthesis, structure investigation and its application as an efficient heterogeneous sulfoxidation catalyst
Amini, Mojtaba,Sheykhi, Ayda,Naslhajian, Hadi,Bayrami, Arshad,Bagherzadeh, Mojtaba,Ho?yńska, Ma?gorzata
, p. 103 - 108 (2017)
Tetraethylammonium salt of a new Keggin-type 12-molybdovanadate nanocluster, [(C2H5)4N]4[VMo12O40] (1) was synthesized via reaction between sodium tungstate, ammonium vanadate and tetraethylammonium bromide in acidic medium. Compound 1 was characterized by X-ray crystallography, FT-IR, UV–Vis and cyclic voltammetry and then applied as an efficient heterogeneous catalyst to oxidation of various organosulfides to sulfoxides with H2O2 at room temperature with 81–100% conversion and 60–99% selectivity. Nanocluster 1 was also shown to display excellent recyclability – it can be reused more than 10 times.
Mo(vi) complex supported on Fe3O4 nanoparticles: magnetically separable nanocatalysts for selective oxidation of sulfides to sulfoxides
Keypour, Hasan,Balali, Masomeh,Haghdoost, Mohammad Mehdi,Bagherzadeh, Mojtaba
, p. 53349 - 53356 (2015)
A molybdenum complex, [MoO2Cl2(DMSO)2], was immobilized on amino propyl and Schiff base modified magnetic Fe3O4@SiO2 nanoparticles by covalent linkage. The resulting nanoparticles were used as efficient and recyclable catalysts for the selective oxidation of sulfides to sulfoxides using urea hydrogen peroxide as the oxidant. The complete characterization of catalysts was carried out by means of thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), X-ray photoelectron spectroscopy (XPS), elemental analysis, FT-IR and Raman microprobe techniques.
New mononuclear manganese(II) complexes with 2,4,6-tris(2-pyridyl)-1,3,5- triazine (tptz) - Selective catalyst in UHP oxidation of sulfides
Najafpour, Mohammad Mahdi,Holynska, Malgorzata,Shamkhali, Amir Nasser,Amini, Mojtaba,Kazemi, Sayed Habib,Zaynalpoor, Sasan,Mohamadi, Rahim,Bagherzadeh, Mojtaba,Lis, Tadeusz
, p. 202 - 209 (2012)
A new manganese complex of the formula [Mn(tptz)(OH2) 3](CF3SO3)2·EtOH, (1, where tptz = (2,4,6-tris(2-pyridyl)-1,3,5-triazine) is presented, exhibiting an excellent catalytic activity and selectivity in oxidation of various sulfides to the corresponding sulfoxides with UHP (urea hydrogen peroxide) as oxidant under air at room temperature. A modified preparation procedure produces another new manganese complex of the formula [Mn(tptz)(CH3COO)(OH 2)2](CF3SO3)·3H2O (2). X-ray structures of both Mn(II) complexes, properties (elemental analysis, electrochemistry, EPR, IR, Raman, and UV-Vis spectra), as well as DFT studies results are reported.
Nanolayered manganese-calcium oxide as an efficient catalyst toward organic sulfide oxidation
Amini, Mojtaba,Najafpour, Mohammad Mahdi,Naslhajian, Hadi,Amini, Emad,Farnia, S. Morteza F.
, p. 10851 - 10855 (2014)
We for the first time report that nanolayered Mn-Ca oxide in the presence of H2O2 is an efficient catalyst toward sulfide oxidation to sulfoxide. We characterized the catalyst by DLS, UV-Vis, diffuse reflectance infrared Fourier transform spectroscopy, SEM, TEM and HRTEM. We also considered different parameters of the sulfide-oxidation reaction.
Synthesis and characterization of molybdenum complex supported on magnetic and non-magnetic supports: comparing their catalytic activity, selectivity, and reusability
Bagherzadeh, Mojtaba,Balali, Masomeh,Haghdoost, Mohammad Mehdi,Keypour, Hassan
, p. 673 - 685 (2019)
A molybdenum complex was immobilized on Schiff-base-modified magnetic and non-magnetic particles by covalent linkage. The characterizations of the obtained materials were carried out by means of TG–DTG, SEM, TEM, VSM, XPS, IR, and Raman microprobe techniques. All of them exhibited efficient activities in the oxidation of sulfides to sulfoxides by urea hydrogen peroxide oxidant. The advantages and disadvantages of these catalysts are discussed in detail. Molybdenum complex immobilized on silica bead can be recycled and recovered by simple filtration, but it demonstrated low activity in catalytic oxidation reaction. Immobilization on nano-SiO2 leads to the formation of nanocatalyst having high catalytic activity but inefficient reusability. The best results were obtained with nano-Fe3O4 magnetic support. The immobilized molybdenum complex on silica-coated magnetic nanoparticles can easily be recovered from the reaction system using an external magnet and reused several times with high yields.
