Polarographic Behavior of Aniline Oxidation Products

1944 ◽  
Vol 66 (3) ◽  
pp. 496-496 ◽  
Author(s):  
David Lester ◽  
Leon A. Greenberg
Keyword(s):  
Oxidation Products ◽  
Polarographic Behavior ◽  
Aniline Oxidation

Redox properties of nanostructured aniline oxidation products formed under different pH conditions

2014 ◽  
Vol 11 (5/6/7/8) ◽  
pp. 458
Author(s):  
Paul A. Kilmartin ◽  
Damien Robert ◽  
Ashveen Nand ◽  
Geoffrey I.N. Waterhouse ◽  
Jadranka Travas Sejdic
Keyword(s):  
Redox Properties ◽  
Oxidation Products ◽  
Aniline Oxidation ◽  
Ph Conditions

Self-Assembled, Nanostructured Aniline Oxidation Products: A Structural Investigation

2008 ◽  
Vol 41 (9) ◽  
pp. 3125-3135 ◽  
Author(s):  
Zoran D. Zujovic ◽  
Lijuan Zhang ◽  
Graham A. Bowmaker ◽  
Paul A. Kilmartin ◽  
Jadranka Travas-Sejdic
Keyword(s):  
Structural Investigation ◽  
Oxidation Products ◽  
Aniline Oxidation ◽  
Self Assembled

Polyaniline: The infrared spectroscopy of conducting polymer nanotubes (IUPAC Technical Report)

2011 ◽  
Vol 83 (10) ◽  
pp. 1803-1817 ◽  
Author(s):  
Miroslava Trchová ◽  
Jaroslav Stejskal
Keyword(s):  
Conducting Polymer ◽  
Aqueous Media ◽  
Ftir Spectra ◽  
Oxidation Products ◽  
Ammonium Peroxydisulfate ◽  
Technical Report ◽  
Alkaline Conditions ◽  
Aniline Oxidation ◽  
Aniline Oligomers ◽  
Granular Morphology

Polyaniline (PANI), a conducting polymer, was prepared by the oxidation of aniline with ammonium peroxydisulfate in various aqueous media. When the polymerization was carried out in the solution of strong (sulfuric) acid, a granular morphology of PANI was obtained. In the solutions of weak (acetic or succinic) acids or in water, PANI nanotubes were produced. The oxidation of aniline under alkaline conditions yielded aniline oligomers. Fourier transform infrared (FTIR) spectra of the oxidation products differ. A group of participants from 11 institutions in different countries recorded the FTIR spectra of PANI bases prepared from the samples obtained in the solutions of strong and weak acids and in alkaline medium within the framework of an IUPAC project. The aim of the project was to identify the differences in molecular structure of PANI and aniline oligomers and to relate them to supramolecular morphology, viz. the nanotube formation. The assignment of FTIR bands of aniline oxidation products is reported.

scholarly journals The Applications of Solid-State NMR to Conducting Polymers. The Special Case on Polyaniline

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 444 ◽  
Author(s):  
Zoran Zujovic ◽  
Paul A. Kilmartin ◽  
Jadranka Travas-Sejdic
Keyword(s):  
Solid State ◽  
Conducting Polymers ◽  
Solid State Nmr ◽  
Oxidation Products ◽  
Morphological Properties ◽  
Structural Investigations ◽  
Synthesis Conditions ◽  
Aniline Oxidation ◽  
Nmr Techniques

Polyaniline is one of the most well studied conducting polymers due to its advanced electrical, chemical, redox and morphological properties. The high conductivity of regular polyaniline, when partially oxidized and doped under acidic conditions, has been associated with the formation of unique electronic states known as polarons and bipolarons. Alternative aniline oxidation products and interesting nanotube and nanorod forms have been observed as the synthesis conditions are varied. Solid-state NMR has offered great opportunities for structural investigations and the determination of molecular dynamics in such a complex and diverse material. This review summarizes various applications of solid-state NMR techniques to polyaniline and its derivatives and the information that can be obtained by solid-state NMR.

The Anticoagulant Activity of 3.3’-(p-Alkylthio-Benzylidene)-Bis-4-Hydroxycoumarins and Their Oxidation Products

1967 ◽  
Vol 17 (01/02) ◽  
pp. 277-286 ◽  
Author(s):  
Maria Gumińska ◽  
M Eckstein ◽  
Barbara Stachurska ◽  
J Sulko
Keyword(s):  
Biological Activity ◽  
Anticoagulant Activity ◽  
Oxidation Products ◽  
Para Position ◽  
Sulphur Atom ◽  
Group I ◽  
One Step

SummaryThe anticoagulant activity of 3.3’-(benzylidene)-bis-4-hydroxycoumarin derivatives has been estimated by one step Quick’s method. The derivatives contained the following groups in the para position of benzylidene residue: NCS- (I), CH3-S- (II), CH3-SO-(III), CH3-S02- (IV), C2H5-S- (V), C2H5-SO- (VI), C2H5-S02- (VII). All these compounds were much more active than 3.3’-(benzylidene)-bis-4-hydroxycoumarin itself.Compounds possessing the ethyl chain at the sulphur atom (V, VI, VII) were more active than methyl homologues (II, III, IV). Comparison of the activity of the series of thio-, sulphoxy-, and sulphonyl-derivatives showed that among methyl- and ethyl-derivatives those with the sulphoxy grouping (III, VI) displayed the greatest anticoagulant activity. The action of sulphonyl (IV, VII) and thio-derivatives (II, V) was weaker and shortest. The derivative with the NCS-group (I) possessed a relatively the lowest activity among the investigated compounds. 3.3’-(p-Ethylsulphoxybenzyl-idene)-bis-4-hydroxycoumarin (VI), with distinct biological activity reached about ½ of dicoumarol activity.

Mechanistic Insights into Fe Catalyzed α-C-H Oxidations of Tertiary Amines

2019 ◽  
Author(s):  
Christopher J. Legacy ◽  
Frederick T. Greenaway ◽  
Marion Emmert
Keyword(s):  
Free Radical ◽  
Catalytic Mechanism ◽  
Catalyst System ◽  
Oxidation Products ◽  
Tertiary Amines ◽  
Catalyst Activation ◽  
Rate Determining Step ◽  
Fe Catalyst ◽  
Ligand Coordination ◽  
Rate Kinetics

We report detailed mechanistic investigations of an iron-based catalyst system, which allows the α-C-H oxidation of a wide variety of amines, including acyclic tertiary aliphatic amines, to afford dealkylated or amide products. In contrast to other catalysts that affect α-C-H oxidations of tertiary amines, the system under investigation employs exclusively peroxy esters as oxidants. More common oxidants (e.g. tBuOOH) previously reported to affect amine oxidations via free radical pathways do not provide amine α-C-H oxidation products in combination with the herein described catalyst system. Motivated by this difference in reactivity to more common free radical systems, the investigations described herein employ initial rate kinetics, kinetic profiling, Eyring studies, kinetic isotope effect studies, Hammett studies, ligand coordination studies, and EPR studies to shed light on the Fe catalyst system. The obtained data suggest that the catalytic mechanism proceeds through C-H abstraction at a coordinated substrate molecule. This rate-determining step occurs either at an Fe(IV) oxo pathway or a 2-electron pathway at a Fe(II) intermediate with bound oxidant. We further show via kinetic profiling and EPR studies that catalyst activation follows a radical pathway, which is initiated by hydrolysis of PhCO3 tBu to tBuOOH in the reaction mixture. Overall, the obtained mechanistic data support a non-classical, Fe catalyzed pathway that requires substrate binding, thus inducing selectivity for α-C-H functionalization.<br>

Study on the Oxidation Products of Hemp Seed Oil and its Application in Cosmetics

2020 ◽  
Vol 57 (3) ◽  
pp. 230-236 ◽  
Author(s):  
Yawei Huang ◽  
Liujun Pei ◽  
Xiaomin Gu ◽  
Jiping Wang
Keyword(s):  
Seed Oil ◽  
Oxidation Products ◽  
Hemp Seed

Comparative TG/DTG/DTA+FTIR Studies Concerning the Stability of Some Mineral and Vegetable Electro-Insulating Fluids

2018 ◽  
Vol 69 (9) ◽  
pp. 2366-2371
Author(s):  
Andrei Cucos ◽  
Petru Budrugeac ◽  
Iosif Lingvay ◽  
Adriana Mariana Bors ◽  
Andreea Voina
Keyword(s):  
Vegetable Oils ◽  
Electrical Equipment ◽  
Inert Atmosphere ◽  
Oxidation Products ◽  
Gaseous Products ◽  
Mineral Oils ◽  
Ftir Studies ◽  
Dta Analysis ◽  
Anti Oxidant ◽  
The Stability

Thermal TG/DTG/DTA analysis coupled with FTIR spectroscopy was applied to some sorts of mineral and vegetable oils used in electrical equipment. On heating in inert atmosphere, it was observed that the mineral oils vaporize, while the vegetable oils undergo hydrolysis, yielding fatty acids as main volatiles, as indicated by FTIR. In synthetic air, the FTIR spectra of gaseous products confirm the presence of similar oxidation products, both for mineral and vegetable oils. The TG results indicated that the vegetable-based oils exhibit a substantially higher thermal stability than the mineral oils. The presence or absence of anti-oxidant inhibitors in these oils greatly influences the onset of the oxidation process in air environment factor, as results from the DTA results.

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