Synthesis and characterization of phenyl-capped oligoanilines

Sun, Zaicheng; Jing, Xue-Hui; Wang, X.H.; Li, J.; Wang, F.S.

doi:10.1016/s0379-6779(00)01112-7

Cited by 5 publications

(6 citation statements)

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“…The presence of amine functionality is supported with the existing band at 1304 cm −1 for the C-N stretching mode, as previously reported [41]. The bands at 1000-567 cm −1 are due to various substituted benzene rings [38,40,41] in the network. 1500 cm −1 (C=C stretching), 1435 cm −1 (C-C stretching), and 1206 cm −1 (C-H bending) are characterizing the aromatic ring [41].…”

Section: Ftir Analysissupporting

confidence: 85%

“…The spectra revealed a broad peak centered at 3404 cm −1 assigned for the N-H stretching band of primary amine (-NH 2 ) [37], which overlapped with O-H from physisorbed water. The peaks around 2916 and 1435 cm −1 are due to the aliphatic C-H stretching and scissor-like bending vibrations, indicating that the crosslinking reaction was successful [38]. The peak at 3009 cm −1 is part of aromatic =C-H (sp 2 -C) stretching bands.…”

Section: Ftir Analysismentioning

confidence: 96%

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Synthesis of Poly(aniline-co-benzene)-Based Hypercrosslinked Polymer for Hg(II) Ions Removal from Polluted Water: Kinetic and Thermodynamic Studies

Aljboar,

Alghamdi,

Al-Odayni

et al. 2023

Water

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The aim of this work was to investigate the adsorption performance of a highly crosslinked poly(aniline-co-benzene) (PAB) copolymeric network. This hypercrosslinked polymer (HCP) was obtained via the Friedel–Craft reaction in the presence of FeCl3 as an alkylation catalyst. The HCP was characterized using FTIR, SEM, TGA-DTA-DSC thermograms, and BET surface area. The analysis revealed a major mesoporous (an average pore diameter of 4.96 nm) structure, a surface area of 987 m2/g, and adequate chemical and thermal stability, thus supporting its potential as an adsorbent. The PAB HCP capability as an adsorbent for removing mercury ions (Hg2+) from wastewater was examined, and the data obtained were kinetically and thermodynamically modeled. The data were found to fit PFO well (R2 = 0.999), suggesting a physisorption process and a rate-limiting step involving the diffusion process, as proven with IPD and LFD models. The adsorption of Hg2+ on PAB was spontaneous (ΔG° is negative; −4.41 kJ/mol at 298 K), endothermic (ΔH° is positive; 32.39 kJ/mol), and random (ΔS° is positive; 123.48 J/mol·K) at the adsorption interface. The thermodynamic analysis also suggested a physical adsorption mechanism (ΔG° between −20 and 0 kJ/mol). These findings promote the potential application of PAB HCP as an efficient adsorbent for removing Hg2+ ions and other heavy metal ions from polluted environments.

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Section: Ftir Analysissupporting

confidence: 85%

Section: Ftir Analysismentioning

confidence: 96%

Synthesis of Poly(aniline-co-benzene)-Based Hypercrosslinked Polymer for Hg(II) Ions Removal from Polluted Water: Kinetic and Thermodynamic Studies

Aljboar,

Alghamdi,

Al-Odayni

et al. 2023

Water

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“…It is noticed that two main characteristic bands observed in the aromatic ring region between 1596-1595 and 1504-1495 cm −1 are assigned to the quinoid ring and benzenoid rings (due to C=C, C=N and C-C stretching's) vibrations of PS-TAni and GS-TAni. [38][39][40][41] The presence of C=N vibration mode indicates that benzenoid to quinoid change takes place in the oxidized state of TAni. The absorption band at 1312-1300 cm −1 is believed to be due to the C-N stretching vibrations.…”

Section: Resultsmentioning

confidence: 99%

“…These results suggest that the coupling reaction proceeds via p-position. 38 The 1 H NMR spectra of synthesized emeraldine base tetraaniline were obtained in DMSO-d 6 (Figure 2). The number of protons corresponding to each resonance is in good agreement with the proposed structure.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Synthesis and Reduction of Aniline-Tetramer: Application Prospect as MOR Electrocatalyst

Thota

Arukula

Narayan

et al. 2017

J. Electrochem. Soc.

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The emeraldine-base form of aniline-tetramer (TAni-EB) is synthesized from N-phenyl-p-phenylenediamine by electrochemical (Potentio static and Galvano static) methods. Chemically synthesized TAni-EB is reduced electrochemically for the first time in literature to its lower (Lueco-emeraldine, LEB) oxidation state. The obtained TAni-EB and TAni-LEB were characterized by FT-IR, 1 H NMR, UV-Vis, conductivity (four probes) and cyclic voltammetry. Cyclic voltammograms of chemically synthesized and electrochemically synthesized TAni showed identical redox peaks. The aniline-tetramer (EB) is first time used as support for platinum Nano particles (Pt/TAni) for methanol electro-oxidation. The Pt nanocomposites are characterized using XRD, FE-SEM, EDAX and XPS analyses. Carbon-CS-TAni, Carbon-PS-TAni and Carbon-GS-TAni supported platinum (Pt/C-CS-TAni, Pt/C-PS-TAni and Pt/C-GS-TAni) nanocomposites are also synthesized and their MOR catalysis is compared. The Pt/C-CS-TAni nanocomposite show better electrocatalytic than Pt/C-PS-TAni, Pt/C-GS-TAni and Pt/CS-TAni toward methanol oxidation.

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“…Our results showed that whereas an exact amount of oxidizing agent was employed for the preparation of PCAT EB, the result was not the half-oxidized state (Figure b). To the best of our knowledge, all of the synthesis routes for the preparation of PANI and its oligomers lead to the LB state. ,, The lack of control over the chemical oxidation process during the preparation of the EB state leads to deviations from the structure consisting of exact 50% amine and 50% imine groups. Therefore, it is believed that the discrepancy in the results from the corrosion inhibition involving EB is related to the challenges associated with the preparation of the exact half-oxidized state of redox-active organic compounds.…”

Section: Discussionmentioning

confidence: 99%

Interfacial Charge Transfer between Phenyl-Capped Aniline Tetramer Films and Iron Oxide Surfaces

et al. 2016

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Redox-active organic compounds have been studied as corrosion inhibitors for steel. Even though it is clear that chemical interactions at the organic–metal oxide interface are behind this inhibitive process, the detailed mechanism is not yet fully understood. Using phenyl-capped aniline tetramer (PCAT), we have elucidated the interactions at the interface with iron oxide. We demonstrate the partial reduction of fully oxidized PCAT and the partial oxidation of fully reduced PCAT upon interaction with iron oxide. X-ray photoelectron spectroscopy reveals the appearance of charged nitrogen structures in PCAT deposited on hematite. Iron oxide films in contact with reduced PCAT show a higher conductance due to the introduction of defects, resulting in n-doping. In contrast, the iron oxide film in contact with oxidized PCAT shows a lower conductance, indicating that defects in the film are removed via oxidation, thus reducing the doping level. This is consistent with accepted models for corrosion inhibition, in which PCAT assists in the formation of a passive oxide film. These results are indicative of interfacial charge transfer between PCAT and iron oxide. The extent of the charge transfer and the direction of redox processes depend on the oxidation state of the molecules, enabling the construction of redox-active devices, including sensors and switches.

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Synthesis and characterization of phenyl-capped oligoanilines

Cited by 5 publications

References 0 publications

Synthesis of Poly(aniline-co-benzene)-Based Hypercrosslinked Polymer for Hg(II) Ions Removal from Polluted Water: Kinetic and Thermodynamic Studies

Synthesis of Poly(aniline-co-benzene)-Based Hypercrosslinked Polymer for Hg(II) Ions Removal from Polluted Water: Kinetic and Thermodynamic Studies

Electrochemical Synthesis and Reduction of Aniline-Tetramer: Application Prospect as MOR Electrocatalyst

Interfacial Charge Transfer between Phenyl-Capped Aniline Tetramer Films and Iron Oxide Surfaces

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