The electroreduction of oxygen in aprotic solvents

Solvation of Li+, Be2+, Na+, Mg2+, and Al3+ ions has been studied in binary mixtures with dimethyl sulphoxide, dimethylformamide, acetonitrile and water, and in ternary mixtures of the organic solvents with water. The CNDO/2 quantum chemical method was used to calculate the energies of solvation, molecular structures and charge distributions for the complexes acetonitrile...ion (1:1, 2:1, 4:1), dimethyl sulphoxide...ion (1:1), dimethylformamide...ion (1:1), and acetonitrile (dimethyl sulphoxide, dimethylformamide)...ion...water (1:1:1).

Download Full-text

Oxidation of (1-hydroxybenzyl)ferrocene and its derivatives substituted in phenyl ring with bis(triphenylsilyl) chromate

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19823375 ◽

1982 ◽

Vol 47 (12) ◽

pp. 3375-3380 ◽

Cited By ~ 1

Author(s):

Jaroslav Holeček ◽

Karel Handlíř ◽

Milan Nádvorník ◽

Milan Vlček

Keyword(s):

Linear Dependence ◽

Rate Constants ◽

Oxidation Rate ◽

Phenyl Ring ◽

Equilibrium Constants ◽

Aprotic Solvents ◽

Protonation Equilibrium ◽

Oxidation Of Alcohols ◽

Hammett Σ Constants ◽

Sulphuric Acid Medium

Kinetics have been studied of oxidation of (1-hydroxybenzyl)ferrocenes substituted in phenyl ring with bis(triphenylsilyl) chromate in benzene solutions as well as protonation of these alcohols in sulphuric acid medium. Logarithms of the oxidation rate constants (kobs, 20-40 °C) and those of the protonation equilibrium constants (KR+, 25 °C) show linear dependence on the Hammett σ constants, the ρ constant values being -0.86 to -0.40 and -2.50, respectively. These negative values suggest that the both processes are influenced by the same effects and confirm the mechanism proposed earlier for oxidation of alcohols with ferrocenyl substituent by action of bis(triphenylsilyl) chromate in aprotic solvents.

Download Full-text

1H and 13C NMR spectra of 2,2’-disubstitutedtrans-azobenzenes suitable for preparation of metallized azo dyes

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19912160 ◽

1991 ◽

Vol 56 (10) ◽

pp. 2160-2168 ◽

Cited By ~ 6

Author(s):

Josef Jirman

Keyword(s):

Nmr Spectra ◽

Electron Pair ◽

Phenyl Group ◽

Aprotic Solvents ◽

1H And 13C Nmr ◽

Predominant Form ◽

Rapid Equilibrium ◽

Dipolar Aprotic Solvents ◽

Free Electron Pair ◽

C Nmr

The 1H and 13C NMR spectra have been measured of six trans-azobenzenes substituted at 2 and 2’ positions with substituents favourable for complex formation with a metal (OH, NH2, NHCOCH3, COOH). From the standpoint of NMR such substituted trans-azobenzenes are present in solution in a rapid equilibrium following from rotation around the bond between C-1 of phenyl group and N atom of azo linkage. The predominant form has the substituent in the syn-position with respect to the free electron pair of the nearer azo nitrogen atom. The equilibrium is affected by dipolar aprotic solvents (such as hexadeuteriodimethyl sulfoxide) by decreasing the presence of the predominant form by 1 to 11%.

Download Full-text

Transformation of 1,1-Dichloro-2,2-bis(4-nitrophenyl)ethene in the Reaction with Nitrite Ion in Polar Aprotic Solvents

Russian Journal of General Chemistry ◽

10.1134/s107036322001003x ◽

2020 ◽

Vol 90 (1) ◽

pp. 13-22

Author(s):

E. A. Guzov ◽

V. N. Kazin

Keyword(s):

Aprotic Solvents ◽

Nitrite Ion

Download Full-text

The excited state behaviors of 3-(benzo[d]thiazol-2-yl)-2-hydroxy-5-methoxybenzaldehyde system in aprotic solvents

Chemical Physics ◽

10.1016/j.chemphys.2021.111280 ◽

2021 ◽

pp. 111280

Author(s):

Junyu Li ◽

Shiquan Feng ◽

Xuechao Feng ◽

Jie Wu ◽

Liancai Xu

Keyword(s):

Excited State ◽

Aprotic Solvents

Download Full-text

Integration of the aprotic CO2 reduction to oxalate at a Pb catalyst into a GDE flow cell configuration

Faraday Discussions ◽

10.1039/d0fd00141d ◽

2021 ◽

Author(s):

Maximilian König ◽

Shih-Hsuan Lin ◽

Jan Vaes ◽

Deepak Pant ◽

Elias Klemm

Keyword(s):

Oxalic Acid ◽

Co2 Reduction ◽

Flow Cell ◽

Aprotic Solvents ◽

Cell Configuration ◽

Carbon Neutral

The electrochemical CO2 reduction to oxalic acid in aprotic solvents could be a potential pathway to produce carbon-neutral oxalic acid. One of the challenges in the aprotic CO2 reduction are...

Download Full-text