Search for: sodium-borohydride
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    Reductive amination of aldehydes with sodium borohydride and lithium aluminum hydride in the presence of lithium perchlorate

    , Article Journal of the Iranian Chemical Society ; Volume 4, Issue 2 , 2007 , Pages 194-198 ; 1735207X (ISSN) Saidi, M. R ; Brown, R. S ; Ziyaei Halimjani, A ; Sharif University of Technology
    Iranian Chemical Society  2007
    A one-pot high yielding reductive amination of aldehydes with primary and secondary amines using LiClO4/NaBH4 and LiClO 4/LiAlH4 as reducing agents in diethyl ether is described  

    Highly chemoselective reductive amination-coupling by one-pot reaction of aldehydes, HMDS and NaBH4

    , Article Tetrahedron Letters ; Volume 49, Issue 47 , 2008 , Pages 6682-6684 ; 00404039 (ISSN) Azizi, N ; Akbari, E ; Khejeh Amiri, A ; Saidi, M. R ; Sharif University of Technology
    An efficient and highly chemoselective synthesis of symmetrical secondary amines via reductive amination of aldehydes with inexpensive and commercially available HMDS and sodium borohydride in high to quantitative yields is reported. © 2008 Elsevier Ltd. All rights reserved  

    Sodium borohydride-solid LiClO4: An effective reagent for reducing aldehydes and ketones in aprotic solvent

    , Article Synthetic Communications ; Volume 35, Issue 17 , 2005 , Pages 2271-2276 ; 00397911 (ISSN) Halimjani, A. Z ; Saidi, M. R ; Sharif University of Technology
    An efficient and simple method for the reduction of aldehydes, ketones and acid chlorides has been accomplished by using NaBH4-solid LiClO 4 in mild conditions at ambient temperature with complete chemoselectivity in reduction of α,β-unsaturated aldehydes and ketones. The reaction is fast with high yield and simple workup. Copyright © Taylor & Francis, Inc  

    Investigation of complexation behavior of the dithiocarbamates of N 1 ,N n -dicinnamylalkane-1,n-diamines with metals

    , Article Journal of Molecular Structure ; Volume 1180 , 2019 , Pages 188-195 ; 00222860 (ISSN) Ziyaei Halimehjani, A ; Soleymani Movahed, F ; Fathi, M. B ; Daliri, R ; Saidi, M. R ; Sharif University of Technology
    Elsevier B.V  2019
    Synthesis and characterization of metal dithiocarbamate complexes of N 1 ,N 3 -dicinnamylpropane-1,3-diamine, N 1 ,N 4 -dicinnamylbutane-1,4-diamine and N 1 ,N 6 -dicinnamylhexane-1,6-diamine are reported. The ligands are prepared using cinnamaldehyde and primary diamines to provide the corresponding diimines, followed by reduction with NaBH 4 to afford the corresponding secondary diamines. Diamines react with carbon disulfide in basic medium to furnish the corresponding bis(dithiocarbamate) salts, which underwent complexation with metals. The prepared complexes were characterized by IR, 1 H and 13 C NMR, TGA and elemental analyses. Although the dinuclear metal dithiocarbamate macrocyclic... 

    Fabrication of novel ternary Au/CeO2@g-C3N4 nanocomposite: kinetics and mechanism investigation of 4-nitrophenol reduction, and benzyl alcohol oxidation

    , Article Applied Physics A: Materials Science and Processing ; Volume 124, Issue 6 , 2018 ; 09478396 (ISSN) Kohantorabi, M ; Gholami, M. R ; Sharif University of Technology
    Springer Verlag  2018
    Abstract: Au nanoparticles supported on cerium oxide/graphitic carbon nitride (CeO2@g-C3N4) was synthesized and used as heterogeneous catalyst in redox reaction. The catalyst was characterized by different techniques such as FT-IR, XRD, FE-SEM, EDS, TEM, BET, TGA, and ICP. The as-prepared ternary nanocomposite was used as an effective catalyst for the reduction of toxic 4-nitrophenol to useful 4-aminophenol by NaBH4. The rate constant value of reduction reaction reached up to 0.106 s−1 by Au/CeO2@g-C3N4, which was 3.8, and 8.8 times higher than that of Au@CeO2 (0.028 s−1), and Au@g-C3N4 (0.012 s−1) nanocomposites, respectively. The superior catalytic performance of as-prepared catalyst in... 

    Novel Cu2O/Cu-MOF/rGO is reported as highly efficient catalyst for reduction of 4-nitrophenol

    , Article Materials Chemistry and Physics ; Volume 237 , 2019 ; 02540584 (ISSN) Akbarzadeh, E ; Zare Soheili, H ; Gholami, M. R ; Sharif University of Technology
    Elsevier Ltd  2019
    Cu-MOF/rGO nanocomposite was synthesized by a one-step hydrothermal method and used as proper support for Cu2O particles. Various microscopic and spectroscopic methods were applied to characterize the morphology of Cu2O/Cu-MOF/rGO nanocatalyst. Catalytic results of 4-nitrophenol reduction in the presence of NaBH4 indicate that as-synthesized nanocomposite shown significant improved activity compared with pure Cu2O particles. Enhanced catalytic performance of nanocomposite can be ascribed to the high adsorption ability of Cu-MOF and effective electron transfer due to the presence of rGO. A possible mechanism was proposed for catalytic reduction of 4-nitrophenol over Cu2O/Cu-MOF/rGO. © 2019... 

    Metal-organic framework-templated synthesis of t-ZrO2 /γ-Fe2O3 supported AgPt nanoparticles with enhanced catalytic and photocatalytic properties

    , Article Materials Research Bulletin ; Volume 126 , 2020 Gholizadeh Khasevani, S ; Faroughi, N ; Gholami, M. R ; Sharif University of Technology
    Elsevier Ltd  2020
    A highly selective and effective catalyst and photocatalyst based on Ag, Pt, AgPt nanoparticles (NPs) on the surface of γ-Fe2O3 /t-ZrO2 nanocomposite which was derived from Fe-metal organic framework (Fe-MIL-88A) and Zr-metal organic framework (Zr-UiO-66) was developed. A green synthesis method was used for synthesis of binary nanocomposite (M = Ag, Pt, and Ag@Pt NPs)@γ-Fe2O3/t-ZrO2 and a new composite of γ-Fe2O3, t-ZrO2 structures which was made up by annealing under a nitrogen gas flow. The catalytic potential of the as-synthesized samples were considered toward the reduction of 4-nitrophenol (4-Nip) to 4-aminophenol (4-Amp) by NaBH4 solution at 25 °C and different reaction times. For the... 

    Synthesis of CuCo2O4/BiVO4composites as promise and efficient catalysts for 4-nitrophenol reduction in water: Experimental and theoretical study

    , Article Journal of Environmental Chemical Engineering ; Volume 9, Issue 4 , 2021 ; 22133437 (ISSN) Mirzaee Valadi, F ; Gholami, M. R ; Sharif University of Technology
    Elsevier Ltd  2021
    This study investigates the synthesis of CuCo2O4, BiVO4, and CuCo2O4/BiVO4 nanocomposite by the solvothermal method. The Physico-chemical properties of the samples were verified through Fourier Transform Infrared (FTIR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Transmission Electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDS), Brunauer-Emmett-Teller (BET). Evaluation of catalytic efficiency of the synthesized samples were done in promoting the 4-Nitrophenol reduction to 4-Aminophenol in the existence of high amount of sodium borohydride (NaBH4) as a reducing agent, and the progress of the catalytic reaction was monitored... 

    Long-term investigation on the phase stability, magnetic behavior, toxicity, and MRI characteristics of superparamagnetic Fe/Fe-oxide core/shell nanoparticles

    , Article International Journal of Pharmaceutics ; Volume 439, Issue 1-2 , 2012 , Pages 28-40 ; 03785173 (ISSN) Masoudi, A ; Madaah Hosseini, H. R ; Seyed Reyhani, S. M ; Shokrgozar, M. A ; Oghabian, M. A ; Ahmadi, R ; Sharif University of Technology
    To efficiently enhance the contrast obtaining from magnetic resonance imaging (MRI), pharmaceutical grade colloidal dispersions of PEG coated iron-based nanoparticles were prepared and compared to conventional pure iron oxide contrast agent. In this study, we synthesized ∼14 nm iron nanoparticles via NaBH4 reduction of iron(III) chloride in an aqueous medium. The resulting nanoparticles were further oxidized by two different methods via (CH3)3NO oxygen transferring agent and exposure to oxygen flow. XRD and electron microscopy analyses confirmed the formation of a second layer on the surface of α-Fe core. As magnetic measurements and Mössbauer spectra of 4-months post prepared nanoparticles... 

    Controlling aspect ratio of colloidal silver nanorods using response surface methodology

    , Article Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 393 , 2012 , Pages 46-52 ; 09277757 (ISSN) Hormozi Nezhad, M. R ; Jalali Heravi, M ; Robatjazi, H ; Ebrahimi Najafabadi, H ; Sharif University of Technology
    The properties of metallic nanorods vary due to changes in their composition, size and shape, which all depend on the aspect ratio of the nanorods. This work focuses on the optimization of the aspect ratio of silver nanorods using response surface methodology (RSM). Seed-mediated approach, which is the newest method with less difficulty, has been used for the synthesis of silver nanorods. First, silver ions were reduced with sodium borohydride in the presence of sodium citrate dehydrate, as stabilizer. Then, the prepared seeds were added to a solution containing more metal salts, a weak reducing agent (ascorbic acid) and a rod-like micellar template (cetyltrimethylammonium bromide, CTAB).... 

    Encapsulation of palladium nanoparticles by multiwall carbon nanotubes-graft-poly(citric acid) hybrid materials

    , Article Journal of Applied Polymer Science ; Volume 116, Issue 4 , 2010 , Pages 2188-2196 ; 00218995 (ISSN) Adeli, M ; Mehdipour, E ; Bavadi, M ; Sharif University of Technology
    Citric acid was polymerized onto the surface of functionalized multiwall carbon nanotubes (MWCNTCOOH) and MWCNT-graft-poly(citric acid) (MWCNTg-PCA) hybrid materials were obtained. Due to the grafted poly(citric acid) branches, MWCNT-g-PCA hybrid materials not only were soluble in water but also were able to trap water soluble metal ions. Reduction of trapped metal ions in the polymeric shell of MWCNT-g-PCA hybrid materials by reducing agents such as sodium borohydride led to encapsulated metal nanoparticles on the surface of MWCNT. Herein palladium nanoparticles were encapsulated and transported by MWCNT-g-PCA hybrid materials (MWCNT-g-PCA-EPN) and their application as nanocatalyst toward...