Synthesis of Dendrimer Assisted Co-Pd Bimetallic Nanoparticles and Catalytic Activity for Suzuki–Miyaura Coupling Reactions
Mohammad Sayedul Islam,
Mohammad Wahab Khan
Issue:
Volume 5, Issue 1, March 2019
Pages:
1-8
Received:
31 May 2019
Accepted:
3 July 2019
Published:
22 July 2019
Abstract: Triazine-based dendrimer 2,4,6-tris(di-acetamido)-1,3,5-triazine encapsulated heterogeneous Co-Pd bimetallic nanoparticles (NPS) were prepared through sequential loading method from the dendrimer which was synthesized directly between the reaction of 2,4,6-triamino-1,3,5-triazine and acetyl chloride at room temperature about 2 hours. The physicochemical characteristics of Co-Pd bimetallic NPS were studied with the aid of EDX, XRD, TG& DSC techniques. The presence of cobalt was 55.75% and palladium was 9.40% of the mass of the 2,4,6-tris(di-acetamido)-1,3,5-triazine assisted Co-Pd Bimetallic NPs 4 observed from EDX analysis. The TG& DSC analysis curves indicated the thermal stability up to 320°C which is a very important steadiness key for catalytic effectiveness of the prepared Co-Pd Bimetallic NPs 4. The nano-shape FCC structure of Co-Pd bimetallic NPs was confirmed by XRD analysis. The average size of Co-Pd bimetallic NPs of 17.50 nm length was calculated through the Debye-Scherrer formula while TEM analysis showed the average particle size was 14.50 nm. The dendrimer was also analyzed by IR, 1HNMR, 13CNMR and elemental analysis. The catalytic performance of these nanoparticles' catalyst was explored for C–C coupling reactions such as Suzuki–Miyaura at moderate reaction conditions whereas the reusing potential of the catalyst was evaluated without noticeable loss of activity for five successive runs. All the results of the analysis of this catalyst make it a cost-effective and highly active catalyst for the carbon-carbon cross-coupling reactions which are demand in chemical and pharmaceutical industries.
Abstract: Triazine-based dendrimer 2,4,6-tris(di-acetamido)-1,3,5-triazine encapsulated heterogeneous Co-Pd bimetallic nanoparticles (NPS) were prepared through sequential loading method from the dendrimer which was synthesized directly between the reaction of 2,4,6-triamino-1,3,5-triazine and acetyl chloride at room temperature about 2 hours. The physicoche...
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Characterization of Multinanoporous Pt-TiO2 Thin Films Fabricated by a Three-Step Electrochemical Technique
Ekoko Bakambo Gracien,
Muswema Lunguya Jérémie,
Mbongo Kimpanza Antoine,
Nzazi Kambamba Nicole,
Nduku Mafwa Fabrice,
Musengele Bilasi Denis,
Kidingi Kambasi Pierre,
Ndonganzadi Tresor,
Mukiatom Perbom
Issue:
Volume 5, Issue 1, March 2019
Pages:
9-17
Received:
3 July 2019
Accepted:
24 July 2019
Published:
13 August 2019
Abstract: In the present investigation, a three-step electrochemical as a novel method has been applied to fabricate multinanoporous thin film electrodes of pure TiO2 and the doped Pt-TiO2 (of approximately 15 nm) from the titanium sheet using sulfuric acid as electrolyte and chloroplatinic acid as platinum dopant precursor. Characterization techniques so far discussed in this work revealed that the fabricated products corresponded to pure TiO2 and to the doped Pt-TiO2 respectively. The prepared Pt-TiO2 thin film electrodes have photoresponse to visible light, which indicates a new possibility for improving intrinsic TiO2 photoresponse.
Abstract: In the present investigation, a three-step electrochemical as a novel method has been applied to fabricate multinanoporous thin film electrodes of pure TiO2 and the doped Pt-TiO2 (of approximately 15 nm) from the titanium sheet using sulfuric acid as electrolyte and chloroplatinic acid as platinum dopant precursor. Characterization techniques so fa...
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