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Potentiometric Studies on the Protonation Constants and Protonation Energies of Some Diamines in Methanol + Water Mixtures

The protonation constants of diamines such as ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane,o-phenylenediamine,m-phenylene-diamine,p-phenylenediamine were determined on the basis of Bjerrum and Calvin method in methanol-water mixtures. A pH metric method was used for calculation of protona... Full description

Journal Title: E-journal of chemistry 2007, Vol.4 (3), p.313-319
Main Author: Sharma, Sangita
Other Authors: Shah, Mayur C , Patel, Neha , Dalwadi, Dipika , Vora, J. J
Format: Electronic Article Electronic Article
Language: English
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Publisher: Hindawi Publishing Corporation
ID: ISSN: 0973-4945
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title: Potentiometric Studies on the Protonation Constants and Protonation Energies of Some Diamines in Methanol + Water Mixtures
format: Article
creator:
  • Sharma, Sangita
  • Shah, Mayur C
  • Patel, Neha
  • Dalwadi, Dipika
  • Vora, J. J
subjects:
  • Chemistry
ispartof: E-journal of chemistry, 2007, Vol.4 (3), p.313-319
description: The protonation constants of diamines such as ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane,o-phenylenediamine,m-phenylene-diamine,p-phenylenediamine were determined on the basis of Bjerrum and Calvin method in methanol-water mixtures. A pH metric method was used for calculation of protonation constants. The effects of solvents on protonation constant have been determined at ionic strength 0.2 M dm-3(NaClO4) and temperature 30±0.1oC under nitrogen atmosphere. FORTRAN (IV) programs were used for calculation of protonation constants and distribution of species like H2L, HL, L in equilibrium state. The logarithm of the protonation constants decrease in aliphatic diamines and increase in aromatic diamines with increase in methanol content in mixed equilibria. The verification of constants are explained on the basis of solute-solvent interaction, solvation, proton transfer processes and dielectric constant of equilibria. Protonation energies have been calculated theoretically using computational methods and these protonation energies for aromatic diamines are higher than aliphatic diamines.
language: eng
source:
identifier: ISSN: 0973-4945
fulltext: no_fulltext
issn:
  • 0973-4945
  • 2090-9810
url: Link


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titlePotentiometric Studies on the Protonation Constants and Protonation Energies of Some Diamines in Methanol + Water Mixtures
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descriptionThe protonation constants of diamines such as ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane,o-phenylenediamine,m-phenylene-diamine,p-phenylenediamine were determined on the basis of Bjerrum and Calvin method in methanol-water mixtures. A pH metric method was used for calculation of protonation constants. The effects of solvents on protonation constant have been determined at ionic strength 0.2 M dm-3(NaClO4) and temperature 30±0.1oC under nitrogen atmosphere. FORTRAN (IV) programs were used for calculation of protonation constants and distribution of species like H2L, HL, L in equilibrium state. The logarithm of the protonation constants decrease in aliphatic diamines and increase in aromatic diamines with increase in methanol content in mixed equilibria. The verification of constants are explained on the basis of solute-solvent interaction, solvation, proton transfer processes and dielectric constant of equilibria. Protonation energies have been calculated theoretically using computational methods and these protonation energies for aromatic diamines are higher than aliphatic diamines.
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titlePotentiometric Studies on the Protonation Constants and Protonation Energies of Some Diamines in Methanol + Water Mixtures
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abstractThe protonation constants of diamines such as ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane,o-phenylenediamine,m-phenylene-diamine,p-phenylenediamine were determined on the basis of Bjerrum and Calvin method in methanol-water mixtures. A pH metric method was used for calculation of protonation constants. The effects of solvents on protonation constant have been determined at ionic strength 0.2 M dm-3(NaClO4) and temperature 30±0.1oC under nitrogen atmosphere. FORTRAN (IV) programs were used for calculation of protonation constants and distribution of species like H2L, HL, L in equilibrium state. The logarithm of the protonation constants decrease in aliphatic diamines and increase in aromatic diamines with increase in methanol content in mixed equilibria. The verification of constants are explained on the basis of solute-solvent interaction, solvation, proton transfer processes and dielectric constant of equilibria. Protonation energies have been calculated theoretically using computational methods and these protonation energies for aromatic diamines are higher than aliphatic diamines.
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doi10.1155/2007/978639
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