Cu(II) Complex onto a Pyridine‐Based Porous Organic Polymer as a Heterogeneous Catalyst for Nitroarene Reduction

Abstract

Unlike traditional catalysts, a Cu(II) catalyst incorporated onto a new pyridine based porous organic polymer linked by carboxamide functionality has been developed by impregnation method. Materials are characterized using FT-IR, solid-state NMR, PXRD, SEM, TEM techniques. The uniform confinement effect of the Cu(II) loaded polymer is assured by energydispersive X-ray (EDX) elemental mapping, ICP and AAS spectroscopic analysis. The Cu(II) loaded material further employed as a heterogeneous catalyst for nitroarene reduction and reported as an excellent catalyst with improved performances over those reported using expensive and precious metals (like Au and Pd) on immobilized organic porous materials. The oxidation state of Cu in the catalytic cycle is corroborated with XPS analysis. The present study also emphasizes the role of pelectron rich organic porous polymer as promoter of electronic stature of finely dispersed Cu sites accountable for the excellent catalytic activity towards nitroarene reduction.

Endorsing Organic Porous Polymers in Regioselective and Unusual Oxidative C═C Bond Cleavage of Styrenes into Aldehydes and Anaerobic Benzyl Alcohol Oxidation via Hydride Elimination

“…A standard procedure has been adopted to prepare a nitrogen-rich porous polymer MOP-Am2. , The new stretching frequency of the carbonyl group at 1616 cm –1 in the Fourier transform infrared (FTIR) spectra represents the amide CO of MOP-Am2 (Figure S4). TG analysis shows the material’s thermal stability up to 500 °C with a negligible weight loss (Figure S5).…”

“…This indeed enhances the probability for easy electronic transition that could promote catalysis. Thus, the effective catalytic activity of MOP-Am2 is attributed to the rich delocalization of conjugated π-electrons due to the presence of a nitrogen heteroatom, leading to a strong π···π or C–H···π interaction between the catalyst and styrenes or benzyl alcohols. ,− In effect, it gears up the electron-transfer process between the catalyst and the individual substrate and thereby stimulates catalysis. A similar observation is that an electron-donating group improves styrene conversion and vice versa because of the decrease of the quantitative electric charge on the CC double bond of styrenes.…”

One‐Pot N‐Alkylation of Amines over Ni(II) Embedded Reusable Porous Organic Polymer via Borrowing Hydrogen Strategy

“…Literature evidenced the accomplishment of organic reactions driven by POPs as organocatalyst or as a support matrix for metal incorporation that are promising hosts in heterogeneous catalysis. Among them, phosphine free Suzuki-Miyaura cross-coupling, Heck reaction, Heck-Matsuda reaction, Sonogashira reaction, nitroarene reduction, Chan-Lam coupling, asymmetric synthesis, etc are worth mentioning [27,30] . Recently Jati et al implemented POP with dual metalation i. e. Ir and Ni in heterogeneous catalytic CÀ N coupling reaction under visible light [31] .…”

Metal-free reusable hollow-spherical triazine microporous organic polymer supported quinolines synthesis via hydrogen evolution

“…POPsan emerging field of research designed from purely organic building units connected via strong covalent bonds is of varied interest because of their unique architecture. [12][13][14][15][16] The large pore size and high surface area establish its potential towards gas adsorption/separation, 17 sensing, 18 proton conduction, 19 energy storage, 20 optics, 21 catalysis/ photocatalysis, 15,[22][23][24] etc. The high thermal and chemical stability and insolubility in most of the common organic and inorganic solvents make POPs an excellent candidate for heterogeneous catalysis.…”