Suppression of the polarographic reduction wave of phenylglyoxylic acid by dl-mandelic aacid

1955 ◽  
Vol 42 (9) ◽  
pp. 257-258 ◽  
Author(s):  
W. J. P. Neish
Keyword(s):  
Reduction Wave ◽  
Polarographic Reduction ◽  
Phenylglyoxylic Acid

The polarographic reduction wave of magnesium ion(II) in a molten LiClKCl eutectic mixture

1981 ◽  
Vol 26 (8) ◽  
pp. 1107-1109 ◽  
Author(s):  
Setsuo Furihata ◽  
Kazuo Akashi ◽  
Shunichi Kurosawa
Keyword(s):  
Eutectic Mixture ◽  
Magnesium Ion ◽  
Reduction Wave ◽  
Polarographic Reduction

Electrochemical generation of hydridopentamminerhodium(III) and its reaction with molecular oxygen

1969 ◽  
Vol 47 (22) ◽  
pp. 4241-4246 ◽  
Author(s):  
Leslie E. Johnston ◽  
John A. Page
Keyword(s):  
Molecular Oxygen ◽  
Saturated Calomel Electrode ◽  
Mercury Electrode ◽  
Reduction Wave ◽  
Polarographic Reduction ◽  
Ammoniacal Solution ◽  
Electrochemical Generation ◽  
Dropping Mercury Electrode

The electrochemistry of Rh(NH3)5OH2+ has been studied in a buffered ammoniacal solution. The polarographic reduction wave at the dropping mercury electrode had E1/20 equal to −1.10 V (vs. saturated calomel electrode) in a 0.10 M NH3 – 0.10 M NH4ClO4 electrolyte, and gross Hg cathode electrolysis at −1.19 V produced a stable Rh(NH3)5H2+ hydride species. Both reductions were found to take place through a Rh(I) intermediate.The reaction of the Rh(NH3)5H2+ with molecular O2 in the ammoniacal electrolyte was also studied. The product was demonstrated to be a stable Rh(NH3)4(OH)(O2H)+ hydroperoxo species.

scholarly journals D.C. polarographic reduction wave of 2,3-diketo-L-gulonic acid of carbonyl groups in aqueous solution.

1993 ◽  
Vol 42 (3) ◽  
pp. 159-165
Author(s):  
Kunihiko NAKATA ◽  
Kenji ODA ◽  
Naofumi MORITA ◽  
Shigeo SAWADA ◽  
Masanosuke TAKAGI
Keyword(s):  
Aqueous Solution ◽  
Reduction Wave ◽  
Polarographic Reduction ◽  
Carbonyl Groups

Polarographic reduction of p–substituted 1-phenyl-3-aminocarbonylpyridinium salts

1987 ◽  
Vol 52 (6) ◽  
pp. 1550-1560
Author(s):  
Jiří Krechl ◽  
Daniela Mižaninová ◽  
Jiří Volke ◽  
Josef Kuthan
Keyword(s):  
Supporting Electrolyte ◽  
Substitution Effect ◽  
Heterocyclic Ring ◽  
Reduction Wave ◽  
Polarographic Reduction ◽  
Benzene Nucleus ◽  
Half Wave ◽  
The One ◽  
Low Sensitivity ◽  
Substituted 1

The substitution effect of different groups (H, NO2, COOH, Br, Cl, NHCOCH3, CH3, OCH3, OH, and N(C2H5)2) on the polarographic behaviour of p–substituted 1-phenyl-3-aminocarbonylpyridinium cations has been investigated, in particular on their half-wave potentials in aqueous phosphate buffers pH 6·65 (10% DMF) and in anhydrous solutions of dimethylformamide with 0·05 mol l-1 (n-C4H9)4N+BF4- as supporting electrolyte. The half-wave potentials of the reduction wave which corresponds to the uptake of a single electron (wave B) and to the formation of the primary radical, obey a Hammett correlation in a similar way as it is in the case of 1-benzyl-3-aminocarbonylpyridinium cations. The slope ρπ,R in the Hammett plot equals 0·093 V for 10% DMF and 0·179 V for anhydrous DMF and compares thus with this slope obtained with the 1-benzyl derivatives where 0·095 V was found for water and 0·127 V for anhydrous acetonitrile. The transfer of the substitution effect from the substituent in the para position on the benzene nucleus to the heterocyclic ring in thus equally active in both substances and depends more strongly on the solvent than on the structure of cations of both types. The low sensitivity in both series towards a change in the substituent is explained by the fact that during the uptake of the electron the benzene and the pyridine nucleus are not even approximately coplanar. This is why the π-overlap between the two nuclei is considerably restricted. The analysis of sampled dc-polarographic waves has confirmed that the one-electron uptake is followed by a chemical reaction, most probably a dimer formation or a reaction of the primary product with the starting substance.

The polarographic reduction wave of magnesium ion(II) in a molten LiCl-KCl eutectic mixture

1979 ◽  
Vol 24 (5) ◽  
pp. 581-583 ◽  
Author(s):  
Kazuo Akashi ◽  
Setsuo Furihata ◽  
Shunichi Kurosawa
Keyword(s):  
Eutectic Mixture ◽  
Magnesium Ion ◽  
Reduction Wave ◽  
Polarographic Reduction
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