Jump to ContentJump to Main Navigation
Show Summary Details
Weitere Optionen …

Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus


IMPACT FACTOR 2018: 0.975
5-year IMPACT FACTOR: 1.021

CiteScore 2018: 1.20

SCImago Journal Rank (SJR) 2018: 0.327
Source Normalized Impact per Paper (SNIP) 2018: 0.391

Online
ISSN
2196-7156
Alle Formate und Preise
Weitere Optionen …
Band 225, Heft 2

Hefte

Initial State and Transition State Contributions to Reactivity Trends of Base-Catalyzed Hydrolysis of Some Nitro Chromen-2-One Derivatives

Ezz. A. Abu-Gharib / Rafat. M. EL-Khatib / Lobna A. E. Nassr / Ahmed M. Abu-Dief
Online erschienen: 18.01.2011 | DOI: https://doi.org/10.1524/zpch.2011.0043

Abstract

Base-catalyzed hydrolysis of 6-nitro-2H-chromen-2-one (NC) and 6-nitro-2H-chromen-2-one-3-carboxylic acid (NCC) in binary water/methanol and water/acetone mixtures were studied kinetically at 298 K. The changes in the activation barrier of the investigated compounds from water to water/methanol and water/acetone mixtures were estimated from the kinetic data. Solvent effects on the reactivity trends were analyzed into initial state and transition state components. These were determined from the transfer chemical potentials of the reactants and the kinetic data. The transfer chemical potentials δmμθ for NC were derived from its solubilities in water/methanol and water/acetone mixtures, and the transfer chemical potentials for NCC anion were derived from solubility data for its calcium, cerium and lanthanum salts. Base-catalyzed hydrolysis of NC and NCC in water/methanol and water/acetone mixtures follow a rate law with kobs=k2·c(HO) and kobs=k1+k2·c(HO), respectively. The decrease in the rate constants of base-catalyzed hydrolysis of NC as methanol% or acetone% increases is dominated by the initial state (IS), while the decrease in the rate constants of base-catalyzed hydrolysis of NCC as methanol% or acetone% increases is dominated by the transition state (TS).

Keywords: Chromene-2-Ones; Base-Catalyzed Hydrolysis; Activation Energy Barrier; Transfer Chemical Potential; Initial State

Artikelinformationen

* Correspondence address: Sohag University, Chemistry Department, Faculty of Science, Sohag, 82524, Ägypten,


Online erschienen: 18.01.2011

Erschienen im Druck: 01.02.2011


Quellenangabe: Zeitschrift für Physikalische Chemie, Band 225, Heft 2, Seiten 235–248, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2011.0043.

Zitat exportieren

© by Oldenbourg Wissenschaftsverlag, Sohag, 82524, Germany.Get Permission

Zitierende Artikel

Hier finden Sie eine Übersicht über alle Crossref-gelisteten Publikationen, in denen dieser Artikel zitiert wird. Um automatisch über neue Zitierungen dieses Artikels informiert zu werden, aktivieren Sie einfach oben auf dieser Seite den „E-Mail-Alert: Neu zitiert“.

[3]
Omyma Abd El Aziz Abd Allah and Lobna Abdel-Mohsen E. Nassr
Monatshefte für Chemie - Chemical Monthly, 2016, Jahrgang 147, Nummer 4, Seite 735
[4]
Lobna Abdel-Mohsen Ebaid Nassr and Ali Momamad Shaker
International Journal of Chemical Kinetics, 2014, Jahrgang 46, Nummer 11, Seite 701
[5]
LAILA H. ABDEL-RAHMAN, RAFAT M. EL-KHATIB, LOBNA A. E. NASSR, and AHMED M. ABU-DIEF
International Journal of Chemical Kinetics, 2014, Jahrgang 46, Nummer 9, Seite 543
[6]
E. A. Abu-Gharib, R. M. El-Khatib, L. A. E. Nassr, and A. M. Abu-Dief
Russian Journal of General Chemistry, 2014, Jahrgang 84, Nummer 3, Seite 578
[7]
Ezz A. Abu-Gharib, Rafat EL-Khatib, Lobna A.E. Nassr, and Ahmed M. Abu-Dief
Journal of King Saud University - Science, 2015, Jahrgang 27, Nummer 1, Seite 54
[8]
Laila H. Abdel-Rahman, Rafat M. El-Khatib, Lobna A.E. Nassr, and Ahmed M. Abu-Dief
Journal of Saudi Chemical Society, 2017, Jahrgang 21, Seite S128
[9]
Laila H. Abdel-Rahman, Rafat M. El-Khatib, Lobna A.E. Nassr, and Ahmed M. Abu-Dief
Arabian Journal of Chemistry, 2017, Jahrgang 10, Seite S1835
[10]
Ezz A. Abu-Gharib, Rafat M. EL-Khatib, Lobna A.E. Nassr, and Ahmed M. Abu-Dief
Arabian Journal of Chemistry, 2017, Jahrgang 10, Seite S988

Kommentare (0)