Kinetic study of addition of nitrogen and phosphorus donors bis(maleonitriledithiolate)cobalt(III)

1970 ◽  
Vol 48 (17) ◽  
pp. 2776-2778 ◽  
Author(s):  
Hon. Gee. Tsiang ◽  
C. H. Langford
Keyword(s):  
Kinetic Study ◽  
Adduct Formation ◽  
Axial Position ◽  
Nitrogen And Phosphorus ◽  
First Order ◽  
Square Planar ◽  
Dimeric Form ◽  
Kinetics Of ◽  
The Way

Kinetics of adduct formation of the dimeric form of bis(maleonitriledithiolate)cobalt(III) with pyridine, triphenylphosphine, triphenylarsine, and 1,10-phenanthroline are reported. Rates are first order in ligand and half order in complex dimer in acetone. This suggests addition of the fifth ligand to an uncoordinated axial position of the square planar species as rate controlling. A (presumably) five coordinate intermediate can be detected kinetically on the way to six coordination in the reaction with 1,10-phenanthrioline and its rearrangement to an octahedral six coordinate chelate is slow. All these results may be interpreted in terms of the significant delocalized π bonding in the square planar dithiolene complexes.

Kinetic Study of the Adsorption of Dye onto Cotton in SDS-CTAB Reverse Micelles

2015 ◽  
Vol 723 ◽  
pp. 591-595
Author(s):  
Zu Lan Liu ◽  
Lan Qian Li ◽  
Yi Ping Liu ◽  
Ming Lu
Keyword(s):  
Kinetic Study ◽  
Adsorption Kinetics ◽  
Reverse Micelles ◽  
Adsorption Kinetic ◽  
Order Kinetic ◽  
First Order ◽  
Reactive Blue 19 ◽  
Order Kinetic Model ◽  
Pseudo First Order ◽  
Kinetics Of

Adsorption kinetic study of C.I. reactive blue 19 onto cotton was carried out in SDS-CTAB reverse micelles. The data of adsorption kinetics were examined using pseudo first-and second-order kinetic models. It was found that the adsorption kinetics of dye on cotton with diffusion controlling follows the pseudo first-order kinetic model.

Oxidation of aromatic secondary and tertiary amines by peroxydisulphate. A kinetic study

1971 ◽  
Vol 24 (8) ◽  
pp. 1633 ◽  
Author(s):  
A Sabesan ◽  
N Venkatasubramanian
Keyword(s):  
Transition State ◽  
Kinetic Study ◽  
Tertiary Amines ◽  
Steric Strain ◽  
First Order ◽  
Kinetics Of

The kinetics of the oxidation of aromatic secondary and tertiary amines by peroxydisulphate ion under aqueous basic conditions have been investigated. The reaction is first order in amine and first order in S2O82- ion. The order of the reactivity is found to be: N-methylaniline > N,N-dimethylaniline > aniline and N-ethylaniline > N,N-diethylaniline > aniline, and among each class: N-methylaniline > N-ethylaniline and N,N-dimethylaniline > N,N-diethylaniline. This reactivity is explained on the basis of a steric strain in the transition state super- imposed over the usual polar effects.

The Lewis-acidity of square-planar nickel(II) complexes. III. A kinetic study of the effects of substituents on the addition of 1,10-Phenanthroline to Bis(monothioacetylacetonato)nickel(II) and Bis(dithiophosphato)nickel(II) complexes in toluene

1978 ◽  
Vol 31 (7) ◽  
pp. 1439 ◽  
Author(s):  
MU Fayyaz ◽  
MW Grant
Keyword(s):  
Kinetic Study ◽  
Rate Constants ◽  
Activation Parameters ◽  
Adduct Formation ◽  
Second Order ◽  
Lewis Acidity ◽  
Order Rate ◽  
Measured Rate ◽  
Square Planar ◽  
Inductive Effects

The second-order rate constants and activation parameters for the addition of 1,10-phenanthroline to bis(dialkyldithiophosphato)nickel(II) complexes and substituted bis(monothioacetylacetonato)-nickel(II) complexes in toluene have been measured. Rate constants are in the range 102-108 1. mol-1 s-1 at 25°C, while ΔH‡ is in the range 10-50 kJ mol-1 and ΔS‡ is in the range from -30 to -110 J mol-1 K-1. The higher rate constants, smaller ΔH‡ and more negative ΔS‡ values are associated with complexes with electron- withdrawing substituents. The results are related to the thermo- dynamics of adduct formation, the inductive effects of the substituents and the pKa of the ligands.

ON THE KINETICS OF THE ELECTROWEAK PHASE TRANSITION

1992 ◽  
Vol 03 (05) ◽  
pp. 799-810 ◽  
Author(s):  
W. BUCHMÜLLER ◽  
T. HELBIG
Keyword(s):  
Phase Transition ◽  
Surface Tension ◽  
Decay Rate ◽  
Approximate Formula ◽  
Quantitative Description ◽  
Metastable States ◽  
Electroweak Phase Transition ◽  
First Order ◽  
Kinetics Of ◽  
The Way

We discuss several aspects of the electroweak phase transition, which is generally believed to be first order. Starting from Langer’s theory of metastable states we derive an approximate formula for the decay rate. We then investigate the uncertainties in present evaluations of size and surface tension of critical bubbles and comment on the stumbling blocks on the way towards a quantitative description of the electroweak phase transition.

scholarly journals Kinetic Study of Aluminum Sulphate and Ammonium Aluminum Sulphate Coagulants in Wastewater Treatment

2007 ◽  
Vol 3 (3) ◽  
pp. 222-228
Author(s):  
Lugard Ukiwe ◽  
C.I.A. Nwoko ◽  
Okere-Chijioke M
Keyword(s):  
Wastewater Treatment ◽  
Kinetic Study ◽  
Kinetic Parameters ◽  
Rate Constant ◽  
General Trend ◽  
First Order ◽  
Coagulation Performance ◽  
Aluminum Sulphate ◽  
Kinetics Of ◽  
Mechanism Of The Reaction

An investigation into the kinetics of two inorganic coagulant namely: aluminum sulphate octadecahydrate (Al2(SO4)3.18H2O) an ammonium aluminum sulphate dodecahydrate (NH4Al(SO4)2.12H2O) was studied to determine the effect of certain kinetic parameters on coagulation performance of the above mentioned coagulants. Results of analysis obtained revealed that the rate constant (k) for Al2(SO4)3.18H2O was 5.727s-1, while that for NH4Al(SO4)2.12H2O was 2.282s-1. However, the order of the reaction (xn) of Al2(SO4)3.18H2O and NH4Al(SO4)2.12H2O with the wastewater was 1.0 and 1.0, respectively, indicating that both reactions were first order. Considering the mechanism of the reaction, the general trend observed indicated that the Al2(SO4)3.18H2O reaction was thrice as fast as the NH4Al(SO4)2.12H2O reaction. This fact together with the larger value of k for Al2(SO4)3.18H2O obtained in the experiment lend credence to the widely held believe that Al2(SO4)3.18H2O is a more effective coagulant than NH4Al(SO4)2.12H2O in wastewater treatment.

The kinetic study of the addition of tetrachloromethane to styrene in the presence of copper complexes

1987 ◽  
Vol 52 (7) ◽  
pp. 1758-1763 ◽  
Author(s):  
Li Gwang Hun ◽  
Lubomír Nondek
Keyword(s):  
Activation Energy ◽  
Reaction Mechanism ◽  
Kinetic Study ◽  
Copper Complexes ◽  
Catalytic Mechanism ◽  
First Order ◽  
First Order Kinetics ◽  
Experimental Activation Energy ◽  
Pseudo First Order ◽  
Kinetics Of

Kinetics of the addition of tetrachloromethane to styrene catalyzed by copper-amine complexes was studied. The pseudo-first order kinetics in respect to styrene and the catalyst was observed at an excess of tetrachloromethane. The reaction mechanism involving a catalytic cycle compatible with the kinetic observations is proposed. The experimental activation energy, being about 104 kJ mol-1, indicates a catalytic mechanism.

The Lewis-acidity of square-planar nickel(II) complexes. I. A kinetic and thermodynamic study of the reaction of Bis(O,O-diethyl phosphorodithioato-S,S'-)nickel(II) with bidentate nitrogen donors

1976 ◽  
Vol 29 (4) ◽  
pp. 749 ◽  
Author(s):  
MW Grant ◽  
RJ Magee
Keyword(s):  
Nickel Complex ◽  
Addition Reaction ◽  
Order Rate Constant ◽  
Lewis Acidity ◽  
Polar Solvents ◽  
First Order ◽  
Nitrogen Ligands ◽  
Square Planar ◽  
Kinetics Of ◽  
Kinetic And Thermodynamic Study

The kinetics of the addition reaction between bis(O,O-diethyl phosphorodithioato-S,S'-)nicke1(11) and a series of bidentate nitrogen ligands has been examined by stopped-flow techniques. The reactions are first order in ligand and nickel complex with kf, the second-order rate constant, in the range from 103 to 106 1. mol-1 s-1 at 25�C in benzene. Solvent effects on the reaction with 2,2'-bipyridyl are minor. The variation in kf with ligand is discussed in terms of the steric requirements of the ligands, the bulkiest ligand, 2,9-dimethyl-1,l0-phenanthroline, reacting most slowly. For the ligands 1,l0-phenanthroline and 2,2'-bipyridyl in the more polar solvents, successive displacement of the thiophosphate ligands follows the initial addition step.

scholarly journals Ruthenium (VI) Catalysed Oxidation of Diols by Alkaline Hexacyanoferrate(III) ion – a Kinetic Study

2001 ◽  
Vol 2001 (5) ◽  
pp. 182-184 ◽  
Author(s):  
Kunj Behari ◽  
Roli Srivastava ◽  
Veena
Keyword(s):  
Reaction Mechanism ◽  
Ionic Strength ◽  
Kinetic Study ◽  
Zero Order ◽  
Reduced Form ◽  
Aqueous Alkaline Medium ◽  
First Order ◽  
Order Dependence ◽  
Catalysed Oxidation ◽  
Kinetics Of

The kinetics of Ru(VI) catalysed oxidation of 1,5 pentane diol; 1,6-hexane-diol, 1-pentanol and 1-hexanol by hexacyanoferrate (III) ion in an aqueous alkaline medium at constant ionic strength shows zero order dependence on hexacyanoferrate (III) and first order dependence on Ru(VI) and substrate. The result suggest that a complex is formed between Ru(VI) and diol, which slowly decomposes to give a reduced form of ruthenium, which is reoxidised to Ru(VI) in a fast step be alkaline hexacyanoferrate(III). A plausible reaction mechanism is proposed.

Kinetic of oxidation of methyl orange by vanadium(V) under conditions VO2+ and decavanadates coexist: Catalysis by Triton X-100 micellar medium

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Methyl Orange ◽  
Solution Ph ◽  
Vanadium Concentration ◽  
Limiting Behavior ◽  
First Order ◽  
First Order Kinetics ◽  
Ph Range ◽  
Kinetic Pattern ◽  
Triton X ◽  
Kinetics Of

The kinetics of oxidation of methyl orange by vanadium(V) {V(V)} has been investigated in the pH range 2.3-3.79. In this pH range V(V) exists both in the form of decavanadates and VO2+. The kinetic results are distinctly different from the results obtained for the same reaction in highly acidic solution (pH < 1) where V(V) exists only in the form of VO2+. The reaction obeys first order kinetics with respect to methyl orange but the rate has very little dependence on total vanadium concentration. The reaction is accelerated by H+ ion but the dependence of rate on [H+] is less than that corresponding to first order dependence. The equilibrium between decavanadates and VO2+ explains the different kinetic pattern observed in this pH range. The reaction is markedly accelerated by Triton X-100 micelles. The rate-[surfactant] profile shows a limiting behavior indicative of a unimolecular pathway in the micellar pseudophase.

The Kinetics of Glucose Decomposition with Sulfate Reduction in the Anaerobic Fluidized Bed Reactor

1993 ◽  
Vol 28 (2) ◽  
pp. 135-144 ◽  
Author(s):  
S. Matsui ◽  
R. Ikemoto Yamamoto ◽  
Y. Tsuchiya ◽  
B. Inanc
Keyword(s):  
Sulfate Reduction ◽  
Fluidized Bed ◽  
Kinetic Equations ◽  
Fluidized Bed Reactor ◽  
Order Reaction ◽  
First Order Reaction ◽  
First Order ◽  
Glucose Decomposition ◽  
Reaction Equations ◽  
Kinetics Of

Using a fluidized bed reactor, experiments on glucose decomposition with and without sulfate reduction were conducted. Glucose in the reactor was mainly decomposed into lactate and ethanol. Lactate was mainly decomposed into propionate and acetate, while ethanol was decomposed into propionate, acetate, and hydrogen. Sulfate reduction was not involved in the decomposition of glucose, lactate, and ethanol, but was related to propionate and acetate decomposition. The stepwise reactions were modeled using either a Monod expression or first order reaction kinetics in respect to the reactions. The coefficients of the kinetic equations were determined experimentally. The modified Monod and first order reaction equations were effective at predicting concentrations of glucose, lactate, ethanol, propionate, acetate, and sulfate along the beight of the reactor. With sulfate reduction, propionate was decomposed into acetate, while without sulfate reduction, accumulation of propionate was observed in the reactor. Sulfate reduction accelerated propionate conversion into acetate by decreasing the hydrogen concentration.

Sign in / Sign up

Export Citation Format

Share Document