caa a22 4500 445327928 CHVBK 20180317142727.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10953-011-9722-2 doi (NATIONALLICENCE)springer-10.1007/s10953-011-9722-2 Fathalla Magda Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, P.O. 426, 21321, Alexandria, Egypt aut Kinetics of the Reaction of 2-Chloro-quinoxaline with Hydroxide Ion in ACN-H2O and DMSO-H2O Binary Solvent Mixtures [Elektronische Daten] [Magda Fathalla] The kinetics of alkaline hydrolysis of 2-chloroquinoxaline (QCl) with hydroxide ion was investigated spectrophotometrically at different percentages of aqueous-organic solvent mixtures with acetonitrile (10-60% v/v) and with dimethylesulphoxide (10-80%) over the temperature range from 25 to 45 °C. The reaction was performed under pseudo first order conditions with respect to 2-chloroquinoxaline (QCl). An increase in the percentage of organic solvent (v/v) has different effects on the reaction rate constants, presumably due to hydrogen bond donor and acceptor differences of the media and other solvatochromic parameters. The data were discussed in terms of the Kamelt-Taft parameter and E T(30). A nonlinear relation between the logarithm of the rate constant and reciprocal of the dielectric constant suggests the presence of selective solvation by the polar water molecules. Activation parameters ΔH #, ΔS # and ΔG # were determined and discussed. Springer Science+Business Media, LLC, 2011 2-Chloroquinoxaline nationallicence Hydrolysis nationallicence Spectrophotometry nationallicence Kinetics nationallicence Activation parameters nationallicence Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/7(2011-07-01), 1258-1270 0095-9782 40:7<1258 2011 40 10953 https://doi.org/10.1007/s10953-011-9722-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-011-9722-2 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Fathalla Magda Chemistry Department, Faculty of Science, Alexandria University, Ibrahimia, P.O. 426, 21321, Alexandria, Egypt aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/7(2011-07-01), 1258-1270 0095-9782 40:7<1258 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer