Loading...
Search for: bagherzadeh--m
0.008 seconds
Total 141 records

    Efficient imidazolium salts for palladium-catalyzed Mizoroki-Heck and Suzuki-Miyaura cross-coupling reactions

    , Article Chinese Chemical Letters ; Volume 24, Issue 5 , 2013 , Pages 433-436 ; 10018417 (ISSN) Amini, M ; Bagherzadeh, M ; Rostamnia, S ; Sharif University of Technology
    2013
    Abstract
    The system, Pd(OAc)2/imidazolium salts (L2), was found as an efficient catalyst in the Heck coupling reaction of olefins with aryl halides and Suzuki reactions of various aryl halides with aryl boronic acids under aerobic condition. This catalytic system demonstrates great tolerance to a wide range of groups on all substrates of aryl halides, alkenes and aryl boronic acids  

    Sonochemical fabrication and catalytic properties of α -Fe2O3 nanoparticles

    , Article Journal of Experimental Nanoscience ; Volume 6, Issue 3 , 2011 , Pages 217-225 ; 17458080 (ISSN) Askarinejad, A ; Bagherzadeh, M ; Morsali, A ; Sharif University of Technology
    Abstract
    In this study, α -Fe2O3 (hematite) nanoparticles were synthesised by a sonochemical method. The influence of different factors such as chemical composition of the precursors, atmosphere of the reactions and type of the sonicator on the chemical formula, crystallinity, morphology and size of the obtained products were investigated. Powder X-ray diffraction, scanning electron microscopy and IR spectroscopy, were used to characterise the nanostructures. The catalytic tests were performed in the reaction of methyl phenyl sulphide oxidation. The results exhibit the good catalytic performance of the as-prepared α -Fe2O3 nanoparticles  

    Catalytic performance of Mn3O4 and Co 3O4 nanocrystals prepared by sonochemical method in epoxidation of styrene and cyclooctene

    , Article Applied Surface Science ; Volume 256, Issue 22 , 2010 , Pages 6678-6682 ; 01694332 (ISSN) Askarinejad, A ; Bagherzadeh, M ; Morsali, A ; Sharif University of Technology
    2010
    Abstract
    A simple sonochemical method was developed to synthesis uniform sphere-like Co3O4 and Mn3O4 nanocrystals. Epoxidation of styrene and cyclooctene by anhydrous tert-butyl hydroperoxide over the prepared Co3O4 and Mn3O4 nanocatalysts was investigated. The results of conversion activity were compared with bulk Co3O4 and Mn3O4. Under optimized reaction conditions, the nanocatalysts showed a superior catalytic performance as compared to the bulk catalysts. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and BET surface area, were used to characterize and investigate the nanocatalysts  

    Synthesis and characterization of magnetic silica-supported Mn(II)-substituted polyoxophosphotungstate as catalyst in sulfoxidation reaction

    , Article Journal of Nanoparticle Research ; Volume 18, Issue 10 , 2016 ; 13880764 (ISSN) Moradi Shoeili, Z ; Zare, M ; Bagherzadeh, M ; Sharif University of Technology
    Springer Netherlands  2016
    Abstract
    Abstract: Polyoxometalate-functionalized magnetic nanoparticles (Fe3O4@SiO2–MnPOW) were successfully synthesized via covalent anchoring of Mn(II)-substituted phosphotungstate on ammonium-modified Fe3O4@SiO2 nanoparticles. The complete characterization of nanoparticles has been carried out by scanning electron microscope, energy-dispersive X-ray, X-ray diffraction, Fourier transform infrared and elemental analysis. The resulting nanocomposites were efficient catalysts for the selective oxidation of sulfides with different green oxidants in good to excellent yields and also high selectivity. Leaching and recycling tests showed that the nanocatalyst can be reused several times without... 

    The effect of framework functionality on the catalytic activation of supported Pd nanoparticles in the Mizoroki–Heck coupling reaction

    , Article Comptes Rendus Chimie ; Volume 20, Issue 2 , 2017 , Pages 107-115 ; 16310748 (ISSN) Ashouri, F ; Zare, M ; Bagherzadeh, M ; Sharif University of Technology
    Elsevier Masson SAS  2017
    Abstract
    Palladium nanoparticles (Pd-NPs) were supported on functional and nonfunctional Co-coordination polymers (Pd/CoBDCNH2 and Pd/CoBDC). Advanced analytical techniques revealed that Pd-NPs are supported on the external surface of the polymer framework and the functionalized framework possesses effective influence to prevent Pd-NP aggregation. Supported Pd-NPs were effectively applied as heterogeneous recyclable catalysts in the Mizoroki–Heck C–C cross coupling reactions of iodobenzene and either aromatic or aliphatic terminal alkenes. Catalytic results exhibited that highly dispersed Pd-NPs with low loading (1%) on the functional polymer (Pd/CoBDCNH2) are more effective than aggregated Pd-NPs... 

    Synthesis and properties of Ce-doped TiO2-reduced graphene oxide nanocomposite

    , Article Journal of Alloys and Compounds ; Volume 742 , 2018 , Pages 986-995 ; 09258388 (ISSN) Ahmadi, N ; Nemati, A ; Bagherzadeh, M ; Sharif University of Technology
    Elsevier Ltd  2018
    Abstract
    A nanocomposite of Ce-doped TiO2-reduced graphene oxide (CedT/RGO) was synthesized to evaluate the synergistic effects of constituents on electrical and photoelectric properties. The nanoparticles of titania and CedT were synthesized via the sol-gel method. Then, RGO was prepared using a new version derived from the Hammer's method and hydrothermal methods. Finally, CedT/RGO nanocomposite was synthesized applying hydrothermal method. The nanoparticles and nanocomposite were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Field emission scanning electron microscopy (FESEM), Energy dispersive X-ray spectroscopy and elemental mapping. Then, diffuse reflectance and... 

    A perspective to the correlation between brain insulin resistance and alzheimer: medicinal chemistry approach

    , Article Current Diabetes Reviews ; Volume 15, Issue 4 , 2019 , Pages 255-258 ; 15733998 (ISSN) Rabiee, N ; Bagherzadeh, M ; Rabiee, M ; Sharif University of Technology
    Bentham Science Publishers  2019
    Abstract
    Substantial terms have been recognized on the associated risk elements, comorbidities as well as, putative pathophysiological processes of Alzheimer disease and related dementias (ADRDs) as well as, type 2 diabetes mellitus (T2DM), a few from greatest important disease from the moments. Very much is considered regarding the biology and chemistry of each predicament, nevertheless T2DM and ADRDs are an actually similar pattern developing from the similar origins of maturing or synergistic conditions connected by aggressive patho-corporeal terms and continues to be ambiguous. In this depth-critique article, we aimed to investigate all possibilities and represented a novel and applicable... 

    A perspective to the correlation between brain insulin resistance and Alzheimer: Medicinal chemistry approach

    , Article Current Diabetes Reviews ; Volume 15, Issue 4 , 2019 , Pages 255-258 ; 15733998 (ISSN) Rabiee, N ; Bagherzadeh, M ; Rabiee, M ; Sharif University of Technology
    Bentham Science Publishers  2019
    Abstract
    Substantial terms have been recognized on the associated risk elements, comorbidities as well as, putative pathophysiological processes of Alzheimer disease and related dementias (ADRDs) as well as, type 2 diabetes mellitus (T2DM), a few from greatest important disease from the moments. Very much is considered regarding the biology and chemistry of each predicament, nevertheless T2DM and ADRDs are an actually similar pattern developing from the similar origins of maturing or synergistic conditions connected by aggressive patho-corporeal terms and continues to be ambiguous. In this depth-critique article, we aimed to investigate all possibilities and represented a novel and applicable... 

    Comparison between electrochemical and photoelectrochemical detection of dopamine based on titania-ceria-graphene quantum dots nanocomposite

    , Article Biosensors and Bioelectronics ; Volume 151 , 2020 Ahmadi, N ; Bagherzadeh, M ; Nemati, A ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    In this study, titania-ceria-graphene quantum dot (TC-GQD) nanocomposite was synthesized by hydrothermal method for the first time. The prepared nanomaterials were characterized by XRD, FTIR dynamic light scattering (DLS), FESEM, HRTEM, and EDX spectroscopy along with elemental mapping. The synergistic effect of the nanocomposite components was studied by diffuse reflectance spectroscopy (DRS) and electrical conductivity meter. The results showed that band gap of TC-GQD nanocomposite was shifted to visible lights relative to its components (1.3 eV), and electrical conductivity of the sample was significant increased to 89.5 μS cm−1. After chemical and physical characterization, prepared new... 

    Synthesis and characterization of molybdenum (VI) complex immobilized on polymeric Schiff base-coated magnetic nanoparticles as an efficient and retrievable nanocatalyst in olefin epoxidation reactions

    , Article Applied Organometallic Chemistry ; Volume 34, Issue 3 , 2020 Mortazavi Manesh, A ; Bagherzadeh, M ; Sharif University of Technology
    John Wiley and Sons Ltd  2020
    Abstract
    In this study, a new polymeric functionalized magnetic nanocatalyst containing a molybdenum Schiff base complex was prepared using a few consecutive steps. Poly (methylacrylate)-coated magnetic nanoparticles were synthesized via radical polymerization of methyl acrylate onto modified magnetic nanoparticles followed by the amidation of the methyl ester groups with hydrazine. Polymeric functionalization efficiently provides the advantage that more catalytic units can be grafted on the surface of magnetic nanoparticles. The functionalization process was continued with salicylaldehyde which introduced Schiff base groups on to the surface of the polymeric support. In the final step, the desired... 

    Reactivity studies of biomimetic catalytic epoxidation of alkenes with tetrabutylammonium periodate in the presence of various manganese porphyrins and nitrogen donors: Significant axial ligand π-bonding effects

    , Article New Journal of Chemistry ; Volume 28, Issue 6 , 2004 , Pages 740-747 ; 11440546 (ISSN) Mohajer, D ; Karimipour, G ; Bagherzadeh, M ; Sharif University of Technology
    Royal Society of Chemistry  2004
    Abstract
    Highly selective epoxidation (> 95%) of unfunctionalized alkenes was performed by tetrabutylammonium periodate in the presence of six different phenyl substituted manganese(III) meso-tetraphenylporphyrins [Mn(Por)] and imidazole in CH2Cl2. Electron-withdrawing and bulky substituents on the phenyl groups lowered the catalytic activities of the corresponding Mn(Por). Less bulky alkenes with electron -rich double bonds showed greater reactivity in the epoxidation. Co-catalytic activities of four different classes of axial nitrogen donors are compared in the presence of various Mn(Por). In general no direct correlation was found between co-catalytic activities and the pKa values of the nitrogen... 

    Chromium(III) porphyrin as a selective ionophore in a salicylate-selective membrane electrode

    , Article Analytical Chemistry ; Volume 74, Issue 14 , 2002 , Pages 3312-3320 ; 00032700 (ISSN) Shahrokhian, S ; Hamzehloei, A ; Bagherzadeh, M ; Sharif University of Technology
    2002
    Abstract
    The construction, potentiometric response properties, and applications of a novel ion-selective electrode with high selectivity toward salicylate are described. Chromium(III) tetraphenylporphyrin chloride was used as ion carrier into plasticized PVC membrane. This ionophore is capable of serving as both a positively charged and neutral carrier, depending on the pH of the sample solution. The influence of several variables was investigated to optimize the potentiometric response and selectivity of the electrode. The resulting electrode demonstrates a near-Nernstian response over a wide range of salicylate concentration (10-6-10-1 M). This electrode has a fast response time and micromolar... 

    Simultaneous removal of mercury ions and cationic and anionic dyes from aqueous solution using epichlorohydrin cross-linked chitosan @ magnetic Fe3O4/activated carbon nanocomposite as an adsorbent

    , Article Diamond and Related Materials ; Volume 124 , 2022 ; 09259635 (ISSN) Kaveh, R ; Bagherzadeh, M ; Sharif University of Technology
    Elsevier Ltd  2022
    Abstract
    An economical epichlorohydrin cross-linked chitosan @ magnetic Fe3O4/activated carbon nanocomposite, CH-EP@Fe3O4/AC, was successfully synthesized and used as a suitable adsorbent material for removal of a triphenylmethane cationic dye, Malachite green (MG), an anionic dye, Reactive red 120 (RR120), and Mercury ions (Hg2+) from aqueous solution. The prepared adsorbent has been characterized with Fourier transform infrared spectroscopy, X-ray diffraction, Scanning electron microscopy, Thermogravimetric analysis, Brunauer–Emmett–Teller analysis as well as Vibrating sample magnetometer. According to the result of Brunauer–Emmett–Teller isotherm, the prepared adsorbent has a specific surface area... 

    Monomeric and dimeric oxido-peroxido tungsten(VI) complexes in catalytic and stoichiometric epoxidation

    , Article Coordination Chemistry Reviews ; Vol. 268, issue , 2014 , Pages 83-100 ; ISSN: 00108545 Amini, M ; Haghdoost, M. M ; Bagherzadeh, M ; Sharif University of Technology
    Abstract
    Epoxides are important materials in the production of fine chemicals. Selective oxidation of alkenes to epoxides remains a challenge in synthetic chemistry. There has been considerable progress in tungsten-catalyzed epoxidation of alkenes in recent years. This review highlights the use of monomeric and dimeric oxido-peroxido tungsten(VI) complexes as catalysts or oxidants in homogeneous or heterogeneous catalytic systems for epoxidation of olefins  

    Oxido-peroxido molybdenum(VI) complexes in catalytic and stoichiometric oxidations

    , Article Coordination Chemistry Reviews ; Volume 257, Issue 7-8 , April , 2013 , Pages 1093-1121 ; 00108545 (ISSN) Amini, M ; Haghdoost, M. M ; Bagherzadeh, M ; Sharif University of Technology
    2013
    Abstract
    This review mainly discusses the application of oxido-peroxido Molybdenum(VI) complexes as catalysts or mediators in homogeneous or heterogeneous catalytic systems for oxidations of olefins, sulfides, alcohols, alkanes, and amines toward the synthesis of a variety of organic compounds, such as epoxides, sulfoxides, aldehydes and ketones, carboxylic acids, alcohols and nitroso compounds  

    Highly stable magnetically separable copper nanocatalyst as an efficient catalyst for C(sp2)-C(sp) and C(sp2)-C(sp2) cross-coupling reactions

    , Article Applied Organometallic Chemistry ; 2016 ; 02682605 (ISSN) Keypour, H ; Balali, M ; Nejat, R ; Bagherzadeh, M ; Sharif University of Technology
    John Wiley and Sons Ltd  2016
    Abstract
    A copper catalyst has been explored as an efficient and recyclable catalyst to effect Sonogashira and Suzuki cross-coupling reactions. After modification of 2-(((piperazin-1-ylmethyl)imino)methyl)phenol (PP) on the surface of amorphous silica-coated iron oxide (Fe3O4@SiO2@Cl) magnetic core-shell nanocomposite, copper(II) chloride was employed to synthesize the Fe3O4@SiO2@PP-Cu catalyst, affording a copper loading of 1.52 mmol g-1. High yield, low reaction times, non-toxicity and recyclability of the catalyst are the main merits of this protocol. The catalyst was characterized using Fourier transform infrared, X-ray photoelectron, energy-dispersive X-ray and inductively coupled plasma optical... 

    Highly stable magnetically separable copper nanocatalyst as an efficient catalyst for C(sp2)–C(sp) and C(sp2)–C(sp2) cross-coupling reactions

    , Article Applied Organometallic Chemistry ; Volume 31, Issue 9 , 2017 ; 02682605 (ISSN) Keypour, H ; Balali, M ; Nejat, R ; Bagherzadeh, M ; Sharif University of Technology
    Abstract
    A copper catalyst has been explored as an efficient and recyclable catalyst to effect Sonogashira and Suzuki cross-coupling reactions. After modification of 2-(((piperazin-1-ylmethyl)imino)methyl)phenol (PP) on the surface of amorphous silica-coated iron oxide (Fe3O4@SiO2@Cl) magnetic core–shell nanocomposite, copper(II) chloride was employed to synthesize the Fe3O4@SiO2@PP-Cu catalyst, affording a copper loading of 1.52 mmol g−1. High yield, low reaction times, non-toxicity and recyclability of the catalyst are the main merits of this protocol. The catalyst was characterized using Fourier transform infrared, X-ray photoelectron, energy-dispersive X-ray and inductively coupled plasma optical... 

    Origin of the correlation of the rate constant of substrate hydroxylation by nonheme iron(IV)-oxo complexes with the bond-dissociation energy of the C-H bond of the substrate

    , Article Chemistry - A European Journal ; Volume 15, Issue 27 , 2009 , Pages 6651-6662 ; 09476539 (ISSN) Latifi, R ; Bagherzadeh, M ; De Visser, S ; Sharif University of Technology
    Wiley-VCH Verlag  2009
    Abstract
    Mononuclear nonheme iron containing systems are versatile and vital oxidants of substrate hydroxylation reactions in many biosystems, whereby the rate constant of hydroxylation correlates with the strength of the C-H bond that is broken in the process. The thermodynamic reason behind these correlations, however, has never been established. In this work results of a series of density functional theory calculations of substrate hydroxylation by a mononuclear nonheme iron(IV)-oxo oxidant with a 2 His/ 1Asp structural motif analogous to aketoglutarate dependent dioxygenases are presented. The calculations show that these oxidants are very efficient and able to hydroxylate strong C-H bonds,... 

    Vanadium supported on spinel cobalt ferrite nanoparticles as an efficient and magnetically recoverable catalyst for oxidative degradation of methylene blue

    , Article Applied Organometallic Chemistry ; Volume 33, Issue 10 , 2019 ; 02682605 (ISSN) Salami, R ; Amini, M ; Bagherzadeh, M ; Hosseini, H ; Sharif University of Technology
    John Wiley and Sons Ltd  2019
    Abstract
    Vanadium supported on spinel cobalt ferrite nanoparticles was synthesized and characterized using Fourier transform infrared spectroscopy, X-ray diffraction, energy-dispersive X-ray analysis and transmission electron microscopy. For the first time, the prepared material was used for the catalytic degradation of methylene blue as an organic dye in the presence of hydrogen peroxide as a green oxidant and NaHCO3 as a co-reagent at room temperature. The dependency of removal percentage on various parameters such as amount of catalyst, pH, reaction time and temperature and the effect of radical scavenging agents were studied. Finally, recoverability and reusability of the vanadium supported on... 

    COVID-19 and picotechnology: Potential opportunities

    , Article Medical Hypotheses ; Volume 144 , 2020 Rabiee, N ; Rabiee, M ; Bagherzadeh, M ; Rezaei, N ; Sharif University of Technology
    Churchill Livingstone  2020
    Abstract
    Humanity's challenges are becoming increasingly difficult, and as these challenges become more advanced, the need for effective and intelligent action becomes more apparent. Meanwhile, the novel coronavirus disease (COVID-19) pandemic, which has plagued the world, could be considered as an opportunity to take a step toward the need for atomic engineering, compared to molecular engineering, as well as to accelerate this type of research. This approach, which can be expressed in terms of picotechnology, makes it possible to identify living cell types or in general, chemical and biological surfaces using their atomic arrays, and applied for early diagnosis even treatment of the disease. © 2020...