Effect of Alkyl Structures on the Anti‐stacking and Anchoring of Pd/Diamine‐Functionalized Graphene Nanoparticles in Application in Suzuki Reaction

Abstract

Main observation and conclusion Three diamines (1,8‐diaminooctane/p‐phenylenediamine/biphenylenediamine) with different alkyl groups were used to synthesize the functionalized graphene networks. Pd as the common metal catalyst was used to explore the effects of alkyl types of diamines on anti‐stacking, metal anchoring ability of functional graphene and hence the catalytic performance. The results were discussed by characterization of the material and its catalytic properties. All catalysts showed excellent catalytic performance on the Suzuki cross‐coupling reaction with a high yield of up to 100%. The p‐phenylenediamine and biphenylenediamine functionalized graphene with larger specific surface area was beneficial to improve the stability of the graphene catalyst and maintain good catalytic activity after 5 cycles. The Pd nanoparticles in 1,8‐octanediamine materials have smaller size and a smaller loading with the same or even better catalytic performance than p‐phenylenediamine, biphenylenediamine materials, due to the stronger electron donating ability of N of octanediamine than that of p‐phenylenediamine.

Excellent Effect of Betaine in Dilute Electrolytes and Application to High Performance Aqueous Li‐Ion Batteries

“…Figure 5d and Figure S4 shows the binding energies of the valence electrons for a few detected elements from the anode, with the Ti 2p signal being detected at 457.5 eV and a second 2À (290.26 eV) results from the reaction product of trace CO 2 in air with aqueous electrolyte . [9,11] After cycling, there are no observed signals that can be attributed to Li 2 CO 3 , thus, the surface of anode mainly consist of a misture of small organic molecules orginating from betaine. As shown in Figure S5, 5e, the surface morphology of pristine TiO 2 and LiFePO 4 appeared as a chiseled, clean layer structure, with no excess interface layers observed (Figure S4).…”

Rigid POSS Nanofiller Regulated the Interfacial Self‐assembly of Particles into 2D Monolayer Superlattice with Fixed Interparticle Spacing†

“…Thus, the superlattice may break the properties limit of traditional understanding for assemblies. [ 3‐14 ] For instance, Kovalenko's group constructed 3D superlattices of orientational arrays of the CsPbBr 3 nanocubes, which exhibit “Superfluorescence” phenomenon with exponential fluorescence amplification and ultrafast radiative decay of 22 ps. [ 15 ] Additionally, the superlattices of nanoparticles (SLNPs) also proclaim collective “surface lattice resonance” (optical resonance consists of hybrid plasma and diffraction mode) for generating continuous and strong hotspot coupling.…”

One-step synthesis of PdCu@Ti3C2 with high catalytic activity in the Suzuki–Miyaura coupling reaction

“…In recent years, two-dimensional (2D) materials have been widely used as carriers for the preparation of C-C coupling reactions because of their excellent properties. [1][2][3][4][5] The use of 2D materials as carriers can effectively reduce the amount of Pd, a high-cost noble metal catalyst commonly used in C-C coupling reactions. [6][7][8][9][10][11][12] However, the most widely used 2D substrate, graphene oxide (GO), cannot have both excellent electrical conductivity and hydrophilic properties simultaneously, and this limits the application of GO carriers.…”

“…[6][7][8][9][10][11][12] However, the most widely used 2D substrate, graphene oxide (GO), cannot have both excellent electrical conductivity and hydrophilic properties simultaneously, and this limits the application of GO carriers. There are other problems with the use of GO as a substrate to prepare catalysts for C-C coupling reactions: (1) it requires surface functionalization 1,2 or compounding with other materials 4 to improve its charge transfer capability, making the catalyst preparation process more complicated; (2) the current catalysts have high catalytic activity only in organic solvents, which may have some environmental impact and loss of product; [1][2][3][4][5] and (3) the high Pd content in the catalysts leads to high costs.…”