Reaction of Aromatic Radical Cations with RuCl3·3H2O

2000 ◽  
Vol 65 (6) ◽  
pp. 924-940 ◽  
Author(s):  
Michael Michman ◽  
Miriam Oron ◽  
Hans J. Schaefer
Keyword(s):  
Aromatic Amines ◽  
Radical Cations ◽  
Aromatic Radical ◽  
Controlled Potential Electrolysis ◽  
Controlled Potential

Interactions of RuCl3·3H2O with radical cations of aromatic ethers, 1,4-di-tert-butyl- 2,5-dimethoxybenzene, 3,5-di-tert-butyl-1,2-dimethoxybenzene and 2-tert-butyl-1,4-di- methoxybenzene, and with aromatic amines, 2,4,6-tri-tert-butylaniline and N,N,N',N'-tetra- methyl-1,4-phenylenediamine, were observed by voltammetry. ESR and UV spectroscopies were used for the study of the the first two ethers. The effect of RuCl3·3H2O was also examined by controlled potential electrolysis.

The Interaction of Electrochemically Produced Radical Cations with Substituted Styrenes

1974 ◽  
Vol 52 (9) ◽  
pp. 1643-1647 ◽  
Author(s):  
B. Lionel Funt ◽  
Victor Verigin
Keyword(s):  
Radical Cation ◽  
Radical Cations ◽  
Stable Radical ◽  
Polymerization Process ◽  
Methyl Substituent ◽  
Initial Concentration ◽  
Controlled Potential Electrolysis ◽  
Controlled Potential ◽  
Rate Of Decay ◽  
Rates Of Decay

Relatively stable radical cations of 9,10-diphenylanthracene (DPA) were formed by controlled potential electrolysis of solutions in acetonitrile. The rates of decay of the ions were measured in the absence and presence of substituted styrenes, including α-methylstyrene, trans-β-methylstyrene, p-methylstyrene, and styrene. In rigorously dried solvent the radical cation was relatively stable, and its rate of decay was independent of its initial concentration. In the presence of monomers the rates of decay were increased greatly and were related to the position of the methyl substituent in the styrene structure.The rate was proportional to [Formula: see text] A mechanism is suggested and interpreted to show that the rates of cation decay are indicative of the rates of propagation in the polymerization process.

Polarographic Behaviour of Some Arylazotheophyllines

1993 ◽  
Vol 58 (9) ◽  
pp. 1978-1988
Author(s):  
Mohamed I. Ismail ◽  
Madlene L. Iskander
Keyword(s):  
Diffusion Coefficient ◽  
Model Compound ◽  
Aqueous Media ◽  
Chemical Characteristics ◽  
Polarographic Behaviour ◽  
Physico Chemical ◽  
Controlled Potential Electrolysis ◽  
Azo Group ◽  
Controlled Potential ◽  
Electrolysis Products

The polarographic behaviour of a series of arylazotheophyllines was studied in aqueous alcoholic buffer media and in DMF-0.1 M LiClO4 solution. The redox study gave evidence that the azo group is electroactive in aqueous as well as non-aqueous media. A mechanism interpreting the electrode process is proposed and confirmed through the identification of the controlled potential electrolysis products, the use of a model compound and the application of Hamett's σ-E relationship. The physico-chemical characteristics of these compounds, viz. the diffusion coefficient, dissociation constant, ionization potential and electron affinity, are also included.

scholarly journals Electrochemical Behaviour of N′-(p-toluenesulphonyl)-3-methyl-4-(4′-substituted arylhydrazono) pyrazolin-5-ones

2012 ◽  
Vol 9 (4) ◽  
pp. 1864-1874
Author(s):  
V. Nagaraju ◽  
R. Sreenivasulu ◽  
P. Venkata Ramana
Keyword(s):  
Electrochemical Behaviour ◽  
Reduction Process ◽  
Effect Of Solvent ◽  
Buffer Solutions ◽  
Diffusion Controlled ◽  
Controlled Potential Electrolysis ◽  
Dc Polarography ◽  
Controlled Potential ◽  
Ph Range ◽  
And Diffusion

The electrochemical behaviour of N′-(p-toluenesulphonyl)-3-methyl-4-(4′-substituted arylhydrazono) pyrazolin-5-ones has been investigated at dme and gc electrodes in buffer solutions of pH 2.0, 4.0, 6.0, 8.0 and 10.0 using dc polarography and cyclic voltammetry and coulometry. The compounds exhibit one well defined wave in the entire pH range of study. The process is irreversible and diffusion controlled. Controlled potential electrolysis indicates the involvement of four electrons in the reduction process. The effect of solvent, cations and anions, temperature and substitutents on the mechanism of reduction has been studied. Based on the results obtained the mechanism of reduction has been suggested.

Substituent effects on polarographic reduction of some photographic color intermediates

1976 ◽  
Vol 54 (8) ◽  
pp. 1205-1210 ◽  
Author(s):  
Ahmad S. Shawali ◽  
Bahgat E. El-Anadouli
Keyword(s):  
Dissociation Constants ◽  
Substituent Effects ◽  
Protonated Form ◽  
Acid Dissociation ◽  
Polarographic Reduction ◽  
Substituent Constant ◽  
Acid Dissociation Constants ◽  
Controlled Potential Electrolysis ◽  
Half Wave ◽  
Controlled Potential

Polarographic reduction of two series of benzoylacetanilides has been investigated in 40% (by volume) ethanolic Britton–Robinson buffers. One series (A) contains substituents on the anilide moiety, and the second (B) has substituents on both the anilide and benzoyl moieties. Polarographic controlled-potential electrolysis data indicate that the electroactive species in both series is the protonated form (ArCOCH2CONHAr′)H+. The reduction half-wave potentials of anilides of series A were found to be independent of the nature of the substituent, whereas those of series B show a good linear relationship when plotted vs. the σ substituent constant of the substituent on the benzoyl moiety (ρ = 0.284, r = 0.995). Values of the acid dissociation constants of the keto (K1) and enol (K2) tautomers of the anilides of series A were calculated; unlike their E1/2 values, the pK1 data show a linear correlation with the Hammett substituent constant, σ. The pK2 values show, however, little variation with σ.

ChemInform Abstract: Mechanistic Aspects of β-Bond-Cleavage Reactions of Aromatic Radical Cations

ChemInform ◽  
2010 ◽  
Vol 31 (27) ◽  
pp. no-no
Author(s):  
Enrico Baciocchi ◽  
Massimo Bietti ◽  
Osvaldo Lanzalunga
Keyword(s):  
Bond Cleavage ◽  
Radical Cations ◽  
Aromatic Radical ◽  
Cleavage Reactions
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