The reaction between cobalt(II) ions and Pyridine-2-carbaldehyde oxime in aqueous solution

1974 ◽  
Vol 27 (11) ◽  
pp. 2475 ◽  
Author(s):  
MW Grant ◽  
RJ Magee
Keyword(s):  
Aqueous Solution ◽  
Rate Of Reaction

Pyridine-2-carbaldehyde oxime reacts with cobaltous ion in aqueous solution according to the equation :����������������������� Co2+ + 3LH+1/2O2 → CoL3 + 2H+ + 1/2H2O2 In the absence of oxygen the ligand can function as oxidant. The rate of formation of the cobalt(III)product appears to involve the rate- determining dimerization of the deprotonated cobalt(II) complex, CoL+. Oxygen has no effect on the rate of reaction.

The mechanism of the oxidation of thiocyanate ion by peroxomonosulphate in aqueous solution. II. Kinetics of the reaction

1966 ◽  
Vol 19 (8) ◽  
pp. 1365 ◽  
Author(s):  
RH Smith ◽  
IR Wilson
Keyword(s):  
Aqueous Solution ◽  
Initial Rate ◽  
Stopped Flow ◽  
Thiocyanate Ion ◽  
First Order ◽  
Conductance Method ◽  
Rate Of Reaction ◽  
Kinetics Of

Initial rates of reaction for the above oxidation have been measured by a stopped-flow conductance method. Between pH 2 and 3.6, the initial rate of reaction, R, is given by the expression R{[HSO5-]+[SCN-]} = {kb+kc[H+]}[HSO5-]0[SCN-]20+ka[H+]-1[HSO5]20[SCN-]0 As pH increases, there is a transition to a pH-independent rate, first order in each thiocyanate and peroxomonosulphate concentrations.

On the reaction of furan with bromine in aqueous solution. Observation of the slow hydration of malealdehyde

1983 ◽  
Vol 61 (9) ◽  
pp. 2171-2176 ◽  
Author(s):  
Oswald S. Tee ◽  
B. E. Swedlund
Keyword(s):  
Aqueous Solution ◽  
Rate Constant ◽  
Uv Spectrophotometry ◽  
Stopped Flow ◽  
Geometrical Isomers ◽  
Rate Of Reaction

The rate of reaction of furan with bromine in aqueous solution has been measured and the rate constant obtained by Williamson and Coller is confirmed. However, it is now found that the reaction of bromine with furan in water has two distinct stages: attack of bromine leading to the formation of malealdehyde 3 and hydration of 3 to a 2:1 mixture of the geometrical isomers of its cyclic hydrate 4. This second, slower process is observable by stopped-flow uv spectrophotometry occurring after the consumption of bromine. The observed kinetics are very similar to those recently found for the analogous hydration of phthalaldehyde by McDonald and Martin.

scholarly journals Photodegradation of 2, 4, 5, 6-Tetrachloroisophthalonitrile (Chlorothalonil) by Visible and Ultraviolet Light in the Presence of ZnO and TiO2

2019 ◽  
Vol 7 (3) ◽  
pp. 79-88
Author(s):  
Raad N. Salih ◽  
Salah-Aldin Naman
Keyword(s):  
Aqueous Solution ◽  
Reaction Order ◽  
Product Formation ◽  
Light Sources ◽  
Photo Degradation ◽  
First Order ◽  
Rate Of Reaction ◽  
Degradation Reaction ◽  
Uv Visible ◽  
Arrhenius Factor

photocatalytic degradation of fungicides (chlorothalonil) in suspension aqueous solution with semiconductors (tio­2, zno) and without semiconductor has been investigated. the influence of different parameters such as light sources, the concentration of fungicides, type of semiconductors and temperature were studied by uv-visible spectrophotometer at 232 and 254 nm. the degradation reaction order spectra of chlorothalonil were determined which first order at 232 nm and second order at 254 nm. in addition, the rate constant, arrhenius factor and energy of activation can be estimated for both peaks. moreover, conductivity of chlorothalonil has been recorded during the photo-degradation and the rate of reaction also has been determined that dependent on product formation.

Cephalosporanic acids: a new look at reactions at the C-3' position

1980 ◽  
Vol 289 (1036) ◽  
pp. 173-179 ◽  
Keyword(s):  
Aqueous Solution ◽  
Antibiotic Activity ◽  
Acetoxy Group ◽  
High Yield ◽  
Displacement Reaction ◽  
Yield And Quality ◽  
Nucleophilic Displacement ◽  
Rate Of Reaction ◽  
Kinetics Of ◽  
Very High

Nucleophilic displacement of the acetoxy group of cephalosporanic acids by thiols in aqueous solution at neutral pH provides 3-thiomethyl-substituted compounds with a broad spectrum of antibiotic activity. The aqueous displacement reaction is often destructive of much of the cephalosporanic acid, and products generally require extensive purification. Displacements at a lower pH are complicated by unwanted lactone formation. However, reactions conducted under acid conditions in a variety of anhydrous organic solvents give 3-thiomethyl-substituted compounds in very high yield and quality; no lactone formation is observed. The kinetics of the reaction support an S N 1 mechanism. Protonation of the departing acetoxy group appears therefore critical; the more basic solvents, e.g. dimethylsulphoxide and N , N -dimethylformamide, significantly retard the rate of reaction.

CXLIV.—The rate of reaction between formic acid and iodine in aqueous solution

1926 ◽  
Vol 129 (0) ◽  
pp. 1105-1108 ◽  
Author(s):  
Dalziel Llewellyn Hammick ◽  
Michael Zvegintzov
Keyword(s):  
Aqueous Solution ◽  
Formic Acid ◽  
Rate Of Reaction

scholarly journals Gamma Radiolysis Studies of Aqueous Solution of Brilliant Green Dye

2011 ◽  
Vol 8 (2) ◽  
pp. 680-684
Author(s):  
D. V. Parwate ◽  
S. S. Mankar
Keyword(s):  
Aqueous Solution ◽  
Brilliant Green ◽  
Parent Compound ◽  
Γ Irradiation ◽  
Γ Radiation ◽  
First Order Kinetics ◽  
Gamma Radiolysis ◽  
Rate Of Reaction ◽  
Before And After ◽  
Degradation Reaction

The effect of γ–radiation on colour intensity of aqueous solution of Brilliant Green has been investigated at two different concentrations. The degradation of Brilliant Green (BG) has also been investigated in presence of suspended ZnO, by adding different amounts of ZnO. Simultaneously the conductance and pH of each solution system were measured before and after γ-irradiation. All the γ–irradiations were performed at a dose rate of 0.60 kGyhr-1in GC-900. The maximum dose required for the complete degradation of the dye was found to be 0.39 kGy. G(-dye) values were found to decrease with increase in gamma dose and were in the range 4.26 - 12.81. The conductance (7.6 - 25.3 μS) and pH values increased marginally with dose for both the concentrations. The rate of decolouration was found to be high at lower doses and the efficiency of dye removal was higher at low concentration of the dye. This may be attributed to the presence of reaction by-products from the destruction of parent compound build up and compete for reaction intermediate species. The rate of reaction and rate constants were calculated and it was found that the degradation reaction follows first order kinetics. It was found that the decolouration percentage was more in dye systems in absence of ZnO.

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