Experimental Determination of Activation Energy of Nucleophilic Aromatic Substitution on Porphyrins

2017 ◽  
Vol 95 (1) ◽  
pp. 164-168 ◽  
Author(s):  
Waqar Rizvi ◽  
Emaad Khwaja ◽  
Saim Siddiqui ◽  
N. V. S. Dinesh K. Bhupathiraju ◽  
Charles Michael Drain
Keyword(s):  
Activation Energy ◽  
Experimental Determination ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution

scholarly journals Utility of Certain Nucleophilic Aromatic Substitution Reactions for the Assay of Ethamsylate in its Dosage forms and in Presence of its Degradation Product

2011 ◽  
Vol 7 (1) ◽  
pp. 1223-1239
Author(s):  
F. Belal ◽  
M. Sharaf EL-Din ◽  
M. M. Tolba ◽  
H. Alaa
Keyword(s):  
Degradation Product ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Reaction Products ◽  
Substitution Reactions ◽  
Spectrophotometric Methods ◽  
Experimental Parameters ◽  
Secondary Amino ◽  
Acidic Degradation

The study represents the first report on the development of spectrophotometric methods for determination of ethamsylate (EST) in the presence of hydroquinone as an impurity and/or acidic degradation product. The proposed methods are based on the reaction of EST through it,s secondary amino group either with 1,2-naphthoquinone-4-sulphonate sodium (NQS) at pH 10.7 or 2,4-dinitrofluorobenzene (DNFB) at pH 9.3 to form orange and yellow colored reaction products peaking at 478 and 387 nm for methods (I) and (II), respectively. The different experimental parameters affecting the development and stability of the reaction products in methods (I) and (II) were carefully studied and optimized. The absorbance-concentration plots were rectilinear over the concentration ranges of 2-30 and 2-14 µg mL−1 for methods (I) and (II), respectively. The lower detection limits were 0.13 and 0.19 µg mL−1 and the lower quantitation limits were 0.44 and 0.63 µg mL−1 for methods (I) and (II), respectively. Both methods were successfully applied to commercial ampoules and tablets.

scholarly journals EXPERIMENTAL DETERMINATION OF ACTIVATION ENERGY OF WATER EMULSION

2016 ◽  
Vol 0 (2) ◽  
Author(s):  
Андрей Петрович Марченко ◽  
Андрей Алексеевич Прохоренко ◽  
Анатолий Викторович Савченко
Keyword(s):  
Activation Energy ◽  
Experimental Determination ◽  
Water Emulsion

Determination of Inductive Ignition Period and Activation Energy of Food Dust

2013 ◽  
Vol 750-752 ◽  
pp. 1860-1863 ◽  
Author(s):  
Ivana Turekova ◽  
Zuzana Szabova ◽  
Ivana Kasalova ◽  
Tomáš Chrebet
Keyword(s):  
Activation Energy ◽  
Binding Energy ◽  
Temperature Dependence ◽  
Experimental Determination ◽  
Rate Constant ◽  
Minimum Energy ◽  
Quantum Mechanical ◽  
Reaction Activation Energy ◽  
Mutual Collision

Activation energy is the minimum energy that must have molecules that on their mutual collision has occurred chemical reaction. Activation energy can be calculated by quantum-mechanical relations for the binding energy, or the experimentally determined from the temperature dependence of the rate constant. Paper deals with the calculation of the activation energy using the results of experimental determination of ignition temperatures of food dust.

Experimental determination of a state equation for dissipative granular gases

1999 ◽  
Vol 96 (6) ◽  
pp. 1111-1116 ◽  
Author(s):  
E. Falcon ◽  
S. Fauve ◽  
C. Laroche
Keyword(s):  
Experimental Determination ◽  
State Equation ◽  
Granular Gases
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