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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: nanoparticle,Fuel cell,Toluene-water interface,Suzuki-Miyaura reaction
- چکیده:
- چکیده انگلیسی: The synthesis routes for the preparation of nanostructures have been developed in the past decade. Organometallic precursors played an important role in the synthesis of nanomaterials via various methods of synthesis. In this investigation, nanostructures were synthesized from organometallic precursors and applied as catalyst in various reactions. This mini review is mostly devoted to the research efforts carried out by our group on the search for new classes of organometallic precursors and applying them for the synthesis of nanostructured catalysts with different morphologies. Also we have investigated the effect of alloying and presence of support on catalytic activity. We found that stabilization of nanostructures on graphene oxide, aminoclay, ionic liquids or cyclodextrin supports can increase the catalytic activity by increasing the stability and dispersion. Furthermore, alloyed nanostructures can be efficient like noble metal catalysts in catalytic applications. Also, thin films fabricated by this method showed higher quality in comparison with the thin films fabricated by other synthetic methods.
- انتشار مقاله: 09-03-1399
- نویسندگان: S. Jafar Hoseini,Mehrangiz Bahrami,S. Masoud Nabavizadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Platinum,Oxidative addition,kinetic and mechanism
- چکیده:
- چکیده انگلیسی: Reaction of [PtMe(C^N)(SMe2)] (C^N = 2-phenylpyridinate (ppy); 1a, C^N = benzo[h]quinolate, (bhq); 1b) with hydrogen peroxide gives the platinum(IV) complexes trans-[PtMe(OH)2(C^N)(H2O)] (C^N = ppy; 3a, C^N = bhq, 3b) bearing platinum-oxygen bonds. The Pt(II) complexes 1a and 1b have 5dπ(Pt)→π*(C^N) MLCT band in the visible region which is used to easily follow the kinetic of its reaction with H2O2. The kinetics and mechanism of Pt−O bond formation have been experimentally and theoretically investigated, showing the simple second-order kinetics; rate = k2[H2O2][Pt(II) complex]. The Pt(IV) products were characterized by NMR spectroscopy and elemental analysis. The geometries and the nature of the frontier molecular orbitals of Pt(IV) complexes containing Pt-O bonds were also studied by means of the density functional theory. Complex 3b is unstable during the crystallization process in CH2Cl2/acetone and gives the binuclear complex [Pt2Me2(Cl)2(μ-OH)2(bhq)2], 4.
- انتشار مقاله: 12-09-1398
- نویسندگان: Elahe Hadadi,S. Masoud Nabavizadeh,Fatemeh Niroomand Hosseini
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: nanoparticle,Fuel cell,Toluene-water interface,Suzuki-Miyaura reaction
- چکیده:
- چکیده انگلیسی: The synthesis routes for the preparation of nanostructures have been developed in the past decade. Organometallic precursors played an important role in the synthesis of nanomaterials via various methods of synthesis. In this investigation, nanostructures were synthesized from organometallic precursors and applied as catalyst in various reactions. This mini review is mostly devoted to the research efforts carried out by our group on the search for new classes of organometallic precursors and applying them for the synthesis of nanostructured catalysts with different morphologies. Also we have investigated the effect of alloying and presence of support on catalytic activity. We found that stabilization of nanostructures on graphene oxide, aminoclay, ionic liquids or cyclodextrin supports can increase the catalytic activity by increasing the stability and dispersion. Furthermore, alloyed nanostructures can be efficient like noble metal catalysts in catalytic applications. Also, thin films fabricated by this method showed higher quality in comparison with the thin films fabricated by other synthetic methods.
- انتشار مقاله: 09-03-1399
- نویسندگان: S. Jafar Hoseini,Mehrangiz Bahrami,S. Masoud Nabavizadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Platinum,Oxidative addition,kinetic and mechanism
- چکیده:
- چکیده انگلیسی: Reaction of [PtMe(C^N)(SMe2)] (C^N = 2-phenylpyridinate (ppy); 1a, C^N = benzo[h]quinolate, (bhq); 1b) with hydrogen peroxide gives the platinum(IV) complexes trans-[PtMe(OH)2(C^N)(H2O)] (C^N = ppy; 3a, C^N = bhq, 3b) bearing platinum-oxygen bonds. The Pt(II) complexes 1a and 1b have 5dπ(Pt)→π*(C^N) MLCT band in the visible region which is used to easily follow the kinetic of its reaction with H2O2. The kinetics and mechanism of Pt−O bond formation have been experimentally and theoretically investigated, showing the simple second-order kinetics; rate = k2[H2O2][Pt(II) complex]. The Pt(IV) products were characterized by NMR spectroscopy and elemental analysis. The geometries and the nature of the frontier molecular orbitals of Pt(IV) complexes containing Pt-O bonds were also studied by means of the density functional theory. Complex 3b is unstable during the crystallization process in CH2Cl2/acetone and gives the binuclear complex [Pt2Me2(Cl)2(μ-OH)2(bhq)2], 4.
- انتشار مقاله: 12-09-1398
- نویسندگان: Elahe Hadadi,S. Masoud Nabavizadeh,Fatemeh Niroomand Hosseini
- مشاهده