scholarly journals Complexation Study of Kryptofix22DD with Ag+ Cation in Some Mixed Non-aqueous Binaries Solutions

2020 ◽  
Vol 7 ◽  
Keyword(s):  
Stability Constant ◽  
Metal Cation ◽  
Macrocyclic Ligand ◽  
Molar Conductivity ◽  
Solvent Composition ◽  
Binary Solvent ◽  
Thermodynamic Quantities ◽  
Nonlinear Relationship ◽  
Complex Stoichiometry ◽  
Complexation Reactions

The complexation reactions between Kryptofix22DD, with Ag+ cation, was studied in acetonitrile-dimethylformamide (AN-DMF), acetonitrile- tetrahydrofuran(AN-THF), methanol- tetrahydrofuran (MeOH-THF) and methanol-dimethylformamide (MeOH-DMF) binary non-aqueous dissolvable arrangements at various temperatures utilizing the conductometric strategy. The conductance information shows that in all cases, the complex stoichiometry framed between the macrocyclic ligand and the metal cation is 1:1 [ML]. The experimental results indicate that in any event, the complex stoichiometry formed between the Ag+ and the Kryptofix22DD macrocyclic ligand is 1:1 (ML). The qualities the development constants of the complex have been amassed by plotting the molar conductivity bends-utilizing program, GENPLOT. A nonlinear relationship was observed between the complex's stability constant (log Kf) and the binary solvent composition. The values standard thermodynamic parameters (ΔHc° and ΔSc°) have been determined Dependence of the temperature of constant stability of the complex using van't Hoff plots. The results show that thermodynamic quantities are dependent on nature and Binary Solvent Composition solutions.

Comparison of different algorithms to calculate electrophoretic mobility of analytes as a function of binary solvent composition

2003 ◽  
Vol 24 (10) ◽  
pp. 1596-1602 ◽  
Author(s):  
Abolghasem Jouyban ◽  
Hak-Kim Chan ◽  
Brian John Clark ◽  
Ernst Kenndler
Keyword(s):  
Electrophoretic Mobility ◽  
Solvent Composition ◽  
Binary Solvent

Kinetic Study of the Acid Hydrolysis of Ethyl Hydrogen Succinate in Binary Solvent Mixtures

1978 ◽  
Vol 33 (12) ◽  
pp. 1479-1483 ◽  
Author(s):  
Fayez Y. Khalil ◽  
M. T. Hanna
Keyword(s):  
Organic Solvent ◽  
Free Water ◽  
Solvent Composition ◽  
Initial Increase ◽  
Binary Solvent ◽  
Specific Rate ◽  
Water Medium ◽  
Solvent Mixtures ◽  
Acetone Water ◽  
Hydrolysis Of

Abstract The specific rate constants for the acid-catalysed hydrolysis of ethyl hydrogen succinate in water and in a series of acetone-water and dioxane-water mixtures were determined at 30-45 °C. The solvent composition covered the range 0-90% by weight of the organic solvent. The rate was found to decrease to a minimum at about 80% of the organic solvent then to increase again with successive addition of the latter. In dioxane-water medium a slight initial increase in rate on the first addition of dioxane to water was observed and attributed to an increase in the number of "free" water molecules. The activation energy showed only slight dependence on solvent composition. The radius of the activated complex was calculated in the two media. The thermodynamic parameters were evaluated and discussed in terms of solvent composition. The reaction proved to be essentially an ion-dipole rather than an ion-ion interaction. A comparative discussion of the specific solvent effects of the two solvent systems under consideration is presented, based on the respective bond energies as given by the heats of mixing of the solvent components.

Transition state volumes and solvolysis mechanisms

1970 ◽  
Vol 48 (13) ◽  
pp. 2025-2030 ◽  
Author(s):  
MOYRA J. Mackinnon ◽  
A. B. Lateef ◽  
J. B. Hyne
Keyword(s):  
Transition State ◽  
Benzyl Chloride ◽  
Activation Volume ◽  
Solvent Composition ◽  
Binary Solvent ◽  
Partial Molal Volume ◽  
Butyl Chloride ◽  
Molal Volume ◽  
Reaction Type

The transition state partial molal volume behavior, [Formula: see text] as a function of binary solvent composition was obtained for three reactions by dissection of the activation volume, ΔV*, into initial and transition state components: [Formula: see text] The solvolyses of t-butyl chloride, benzyl chloride, and p-chlorobenzyl chloride represented a gradation of reaction type between SN1 and SN2 and the transition state partial molal volume behavior was found to be distinctly different in each case and in agreement with the mechanistic classification of these reactions.

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