19052-59-6

Upstream product

• 824-78-2 4-nitrophenol sodium salt 
• 100-02-7 4-nitro-phenol 
• 14609-74-6 p-nitrophenolate 
• 51-78-5 p-aminophenol hydrochloride 
• 6119-34-2 p-aminophenoxyl radical 
• 177970-56-8 C₆H₄OS^(2-) 
• 35337-61-2 p-C₆H₄NH₂S^(1-) 
• 120089-55-6 4-hydroxyphenylpentazole 
• 1073-71-8 4-hydroxyphenyldiazonium chloride 

Downstream Products

• 6119-34-2 p-aminophenoxyl radical 
• 35337-61-2 p-C₆H₄NH₂S^(1-) 
• 6373-46-2 p-benzyloxyaniline 

Relevant academic research and scientific papers

Highly efficient reduction of 4-nitrophenolate to 4-aminophenolate by Au/γ-Fe2O3@HAP magnetic composites

In this article, the catalyst Au/γ-Fe2O3@hydroxyapatite (Au/γ-Fe2O3@HAP) consisting of Au nanoparticles supported on the core-shell structure γ-Fe2O3@HAP was prepared through a deposition-precipitation method. The catalyst was characterized by transmission electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, N2 adsorption-desorption and atomic absorption spectrometry. The as-prepared Au/γ-Fe2O3@HAP exhibited excellent performance for the reduction of 4-nitrophenolate (4-NP) to 4-aminophenolate (4-AP) in the presence of NaBH4 at room temperature. Thermodynamic and kinetic data on the reduction of 4-NP to 4-AP catalyzed by the as-prepared catalyst were studied. The as-prepared catalyst could be easily separated by a magnet and recycled 6 times with over 92% conversion of 4-NP to 4-AP. In addition, the as-prepared catalyst showed excellent catalytic performance on other nitrophenolates. The TOF value of this work on the reduction of 4-NP to 4-AP was 241.3 h-1. Au/γ-Fe2O3@HAP might have a promising potential application on the production of 4-AP and its derivatives.

Catalytic performance of the in situ synthesized palladium-polymer nanocomposite

Polymer encapsulated metallic palladium nanoparticles have been synthesized via the oxidative polymerization route using a di-amino naphthalene monomer and a palladium based metal salt. The resultant composite material was characterized by means of optical and microscopic techniques, which offered the information about the chemical structure of the polymer and also the distribution of the metal particles in the composite material. The palladium nanoparticles were homogeneously dispersed throughout the polymer which produced a uniform metal-polymer composite material. The composite material was successfully used for the hydrogenation reaction of the 4-nitrophenolate ion with the evidence of a proton coupled electron transfer (PCET) reaction mechanism. The palladium-polymer composite material was also used as an iodide sensor for the detection of the iodide ion in the presence of other interfering anionic species.

Ag-Fe3O4 nanocomposites@chitin microspheres constructed by in situ one-pot synthesis for rapid hydrogenation catalysis

The fabrication of reusable and biodegradable materials from renewable resources such as chitin is essential for a sustainable world. In the present work, chitin was dissolved in 11 wt% NaOH-4 wt% urea aqueous solution via freezing-thawing, and then chitin microspheres (RChS) were prepared by a sol-gel transition method. Subsequently, novel magnetic Ag-Fe3O 4@chitin microspheres (MRChS) were constructed successfully by an in situ one-pot synthesis of Ag-Fe3O4 nanoparticles onto the RChS surface. The magnetic chitin microspheres displayed a spherical shape with a 3D-mesh structure, and had a narrow size distribution (150-400 μm). There were many micro- and nano-pores existing in MRChS, and the Ag-Fe 3O4 nanoparticles were immobilized through anchoring with the acetyl amine groups of chitin in these pores. The MRChS microspheres were used as a chromatography column packing material for a catalytic reaction column , and exhibited highly effective catalytic activity in the rapid transformation from 4-nitrophenol to 4-aminophenol. Moreover, the microspheres displayed a small hysteresis loop and low coercivity, as well as high turnover frequency (at least 10 times) without any loss of catalytic activity. Thus, MRChS could be quickly removed from the water under a magnetic field, leading to easy recycling and reuse. Therefore, this is an environmentally friendly process, and would be highly beneficial to address industrial requirements. the Partner Organisations 2014.

Synthesis of palladium nanoparticles on citrate-functionalized graphene oxide with high catalytic activity for 4-nitrophenol reduction

Ultrafine Pd nanoparticles homogeneously deposited on citrate- functionalized graphene oxide (PdNPs/Cit-GO) were synthesized by a simple method with the reduction of ascorbic acid. The average size of these PdNPs was 4.67 nm, and they dispersed on the GO surface with high density. Significantly, the as-prepared PdNPs/Cit-GO expresses a high catalytic activity in the reduction of 4-nitrophenol (4-NP). The synergistic effect of the PdNPs/Cit-GO in the catalysis reaction was also demonstrated.

A Broader-scope Analysis of the Catalytic Reduction of Nitrophenols and Azo Dyes with Noble Metal Nanoparticles

In addition to the broad environmental implications associated with the removal of nitroaromatics from industrial effluent, the catalytic reduction of 4-nitrophenol (4NP) has emerged as a benchmark model for quantifying catalytic activity of metal nanoparticles. Here we present a series of noble metal nanoparticles immobilized on amorphous carbon (Au@C, Ag@C, Pt@C and Pd@C). All materials show competitive catalytic activity over 4NP, amino-substituted nitrophenols (ANPs) and azo dyes. Overall, Pd@C exhibits superior activity that increases further when exposed to recycling protocol. Moreover, testing all materials synthesized over a broader substrate scope with added functionalities reveals inconsistencies in the prognosticating ability of the ubiquitous 4NP model reaction. By incorporating variably substituted ANPs into the substrate scope and averaging performance, the resulting rank of catalyst activity more accurately reflects activity trends when applied to other reducible functionalities, such as -N=N- groups in azo dyes.

Metallogels derived from silver coordination polymers of C3-symmetric tris(pyridylamide) tripodal ligands: Synthesis of ag nanoparticles and catalysis

By applying a recently developed crystal engineering rationale, four C3 symmetric tris(pyridylamide) ligands namely 1,3,5-tris(nicotinamidomethyl)-2,4,6-triethylbenzene, 1,3,5-tris(isonicotinamidomethyl)-2,4,6-triethylbenzene, 1,3,5-tris(nicotinamidomethyl)-2,4,6-trimethylbenzene, and 1,3,5-tris(isonicotinamidomethyl)-2,4,6-trimethylbenzene, which contain potential hydrogen-bonding sites, were designed and synthesized for generating AgI coordination polymers and coordination-polymer-based gels. The coordination polymers thus obtained were characterized by single-crystal X-ray diffraction. The silver metallogels were characterized by transmission electron microscopy (TEM) and dynamic rheology. Upon exposure to visible light, these silver metallogels produced silver nanoparticles (AgNPs), which were characterized by TEM, powder X-ray diffraction, energy dispersive X-ray and X-ray photoelectron spectroscopy. These NPs were found to be effectively catalyzed the reduction of 4-nitrophenolate to 4-aminophenolate without the use of any exogenous reducing agent.

The photochemistry of an aryl pentazole in liquid solutions: The anionic 4-oxidophenylpentazole (OPP)

This paper reports a study on the photolysis of an aryl pentazole in solution. 4-Oxidophenylpentazole (OPP) was irradiated in water and in acetonitrile at its first absorption band (320 and 370 nm, respectively) and at 193 nm. 4-Oxidophenylazide (OPA) was

Reduction potentials and kinetics of electron transfer reactions of phenylthiyl radicals: Comparisons with phenoxyl radicals

The reduction potentials relative to the standard hydrogen electrode (SHE) for a number of para-substituted phenylthiyl radicals (Eo(p-XC6H4S./p-XC6H 4S-)) have been derived from pulse radiolytic studies of electron transfer equilibria which compare their values to those of radicals of known reduction potentials. A ladder combining the reduction potentials for both phenylthiyl and phenoxyl radicals has been established. These reduction potentials have been shown to be self-consistent and are intermediate between those of p-benzosemiquinone radical anion at 0.02 V and phenoxyl radical at 0.79 V. The reduction potential decreases as the electron donating power of the para substituent rises. The substituent effect is, however, much weaker for the phenylthiyl radicals than for their oxygen analogs. These observations demonstrate that the electronic interaction between the sulfur atoms and the aromatic ring system is much less than that which occurs with oxygen atoms. Examination of the rates of electron transfer in terms of the Marcus theory indicates that the reorganization energies of both p-XC6H4O. and p-XC6H4S. radicals are similarly affected by H, CH3, and CH3O substitution. However, the reorganization energies increase substantially for H2N and O- para substituents with the effect being much less for the p-XC6H4S. radicals than for the p-XC6H4O. radicals. These observations are in accord with structural information from spectroscopic and theoretical studies of the radicals which show that in the latter system the substituent groups interact strongly with the aromatic π system.