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, <sup>1</sup>HNMR, <sup>13</sup>CNMR 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.
Highlights
Catalytic C-C bond forming reactions provide all reactive synthetic routes to a variety of important chemicals and pharmaceuticals of their building blocks
The advent of nanotechnology for the production of metal nanoparticles opens up new possibilities for a possible revolution in the field of catalysis
As a result the preparation technique for monometallic or bimetallic nanoparticles via dendrimer templates [8,9] has at least five potential benefits: (i) with relatively uniform composition and structure; dendrimer patterns themselves afford distinct nanoparticle replicas; (ii) nanoparticles area unit stabilized by encapsulation in dendrimers and don't agglomerate throughout catalytic reactions; (iii) the nanoparticles are mainly retained in the dendrimers by steric effects, and a substantial portion of their surface is Mohammad Sayedul Islam and Mohammad Wahab Khan: Synthesis of Dendrimer Assisted Co-Pd Bimetallic
Summary
Catalytic C-C bond forming reactions provide all reactive synthetic routes to a variety of important chemicals and pharmaceuticals of their building blocks. Dendrimers are considered to have new types of hosts for containing guest molecules due to their three-dimensional structure with the internal cavity receiving space, so many metal nanoparticles have been successfully synthesized using dendrimer as a template [3,4,5]. Bimetallic dendrimer-encapsulated nanoparticles have been receiving a significant amount of attention due to their promising properties, unique characteristics and novel applications in catalysis and other advanced nano-science and technology areas [10]. To the best of our ability, no research can be acquired in the literature on the synthesis of melamine-based dendrimer embedded bimetallic Co-Pd NPs including the use of their heterogeneous catalytic activity in Suzuki-Miyaura cross-coupling reactions. We have reported the synthesis, characterization, and utilization as a catalyst bimetallic Co-Pd NPs
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