Conductometric Studies for Association Reaction of some Amino Acid Complexes in Water

Al-Allaf, Yaser O.; Al-Tamer, Mohammad Yahya; Abdulfattah, Marwa N.

doi:10.33899/rjs.2013.80281

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…This can be attributed to the influence of temperature on solution properties, such as the decreasing solvent dielectric constant. Notably, (KA) values detect a significant spike at 308K compared to 303K, suggesting an increase in ionic aggregations 23 and short-range commutability reaction 24 . Furthermore, at 313K, the associated ion pair decreases and the distance parameter approaches the contract ion pair (1.00 Ao), resulting in small values of ( ) overall.…”

Section: Np= Number Of Pointsmentioning

confidence: 99%

دراسة توصيلية وحسابية للكلورامفينيكول في مذيبات ودرجات حرارية مختلفة

Abed

2024

Baghdad Sci.J

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In the present work, the electrical conductivity of chloramphenicol was measured in water and methanol at different temperature degrees 293-313 K. The parameters of conductivity equivalent conductance at infinite dilution ( Λ0), the association constant (KA) and distance parameter (R) were all recorded by using Lee-Wheaton equation and the thermodynamic parameters (ΔH, ΔG, and ΔS) were calculated as well. The behavior of a compound can be predicted through computational calculations; taking 2,2-dichloro-N-[(1R,2S)-1,3-dihydroxy-1-(4-nitrophenyl) propan-2-yl] acetamide, for example. There is an abundance of theoretical information available about how this compound behaves in different solvents, such as water and methanol. The secret lies in analyzing the compound's HOMO and LUMO energies, which can be determined through advanced computational calculations using methods like AM1, PM3, and HF. The potential of the compound was different when changing the solvent and this is due to the value of energy and other theoretical factors like the molecular volume and Connolly parameters.

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Section: Np= Number Of Pointsmentioning

confidence: 99%

دراسة توصيلية وحسابية للكلورامفينيكول في مذيبات ودرجات حرارية مختلفة

Abed

2024

Baghdad Sci.J

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“…Many studies on thermodynamics and dissociation constant have been conducted in connection with conductometry with the use of many equations [1][2][3][4][5][6]. Friedrich Kohlrausch (1840-1910), a German chemist, initially proposed the Kohlrausch equation as the outcome of extensive experimental effort.…”

Section: Introductionmentioning

confidence: 99%

Dissociation Constant Studies of 2-Substituted 4-Formylbenzoic Acid based on Conductometric Parameters using Fuoss-Hsia Theories

Kaka

Omer

Taher

et al. 2023

International Journal of Thermodynamics

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The dissociation constant is a quantitative measure of the strength of an acid in solution. This study examines dissociation constant for the series substituted acids like Ortho-alkoxy-4-formylbenzoic acid. The use of (2-methoxy ethanol) as a solvent contributed to the study expected to form free ions or solvent separated ion pair which has been studied with the use conductometric method at different temperatures ranged from 293.15 to 318.15K. The study aims at figuring out dissociation constant, equivalent conductance at infinity dilution, and Walden product by minimization technique using Fuoss-Hsia for both (Modified and Complete) equations. It has been found in the results that the calculated values based on statistical sum square (different between practical and theoretical values) is equivalent conductance at infinity dilution and dissociation constant. It has also been observed that increase the temperature leads to the increase of the molar conductance at infinity dilution, and the increase in association. Moreover, the substituted alkoxy group also affected dissociation of compounds. In this study, the thermodynamic parameters (Ho, Go and So) have also been evaluated and discussed. Finally, the effect of substituent groups on rate of dissociation was studied and explained with agreement to the principles of mesomeric(M) and Inductive effect(I) of substituent groups on dissociation constant.

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Conductometric Study of Proline-Mn (II) Complex in Some Solvents at Various Temperatures, with Computational Factors Calculation

Al-Healy

Abdulrahman

Mahmoud

2021

J. Phys.: Conf. Ser.

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The equivalent conductivities of proline in water, methanol were studied in the temperature range of 288.15 to 313.15 K at 5 K intervals, in mixtures of methanol and water at percentages of 10 %, 20%, 30%, 40% and, 50% of methanol at 37°C. The experimental data were treated by the Lee-Wheaton conductivity equation of unsymmetrical electrolytes (1:2) (1 molecule of metal with 2 molecules of ligand) derived to calculate the conductivity parameters, equivalent conductance at infinite dilution Λₒ, ionic conductivity, association constant Ka and the main distance between ions in solution( R) at best fit values of (6Λ). Thermodynamic quantities for the ion-association reaction ΔG°, Δङ° and ΔS°) have been also measured. The results of the analysis showed that the ions of the complex can be separated by solvent molecules (SSIP). The values of Ka, Λ° and R were found to be different from one solvent to another depending on the interactions in the solution. Furthermore, the chemical structure of the Proline-Mn complex was optimized by using of Gaussian interface version 16.0 program of chem3D to optimiz the features of complex molecule. The suggested statistical model possesses only two parameters with excellent values of the square regression coefficient (r2) and cross-validation (q2) are equal to 0.999 and 0.994, respectively, which refers to the perfect relationship between Ka value and the physical properties of the solvent.

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Conductometric Studies for Association Reaction of some Amino Acid Complexes in Water

Cited by 3 publications

References 5 publications

دراسة توصيلية وحسابية للكلورامفينيكول في مذيبات ودرجات حرارية مختلفة

دراسة توصيلية وحسابية للكلورامفينيكول في مذيبات ودرجات حرارية مختلفة

Dissociation Constant Studies of 2-Substituted 4-Formylbenzoic Acid based on Conductometric Parameters using Fuoss-Hsia Theories

Conductometric Study of Proline-Mn (II) Complex in Some Solvents at Various Temperatures, with Computational Factors Calculation

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