The Oxidative Decarboxylation Of Polyaminocarboxylic Acids - II. A Comparative Kinetic Study Of The Oxidation Of NTA, EDTA, CDTA And Dtpa With Cerium(IV) In Sulfuric Acid Media

The rates of oxidation of four chelating agents, NTA, EDTA, CDTA, and DTPA with Ce(IV), in sulfuric acid media, were determined spectrophotometrically by a stopped-flow technique. The reductive ability is in the order CDTA \u3e EDTA \u3e DTPA \u3e NTA. The influence of varying the acidity of the medium was studied, and in each case a maximum in the rate constant vs. [H+] plot was observed. A possible interpretation of the reactivities and the influence of acidity is advanced. © 1971 Springer-Verlag

Integrated Application of Electronic Structure Computations in the Undergraduate Chemistry Curriculum

This paper describes the integrated use of electronic structure computations in the undergraduate chemistry curriculum including organic, physical, and analytical chemistry courses. This computational tool is used to enhance student learning and understanding of chemical principles along with exposing students to a modern research tool in chemistry. The electronic structure computations are used for homework, classroom activities (including examinations), and laboratory experiments (both computational and wet-lab). Some examples of these uses of electronic structure computations in organic, analytical, and physical chemistry courses are discussed

The Anodic Oxidation Of Methyliminodiacetic Acid (MIDA)on Pt In Perchloric Acid Media

The oxidation of methyliminodiacetic acid (MIDA) on platinized-platinum was studied potentiostatically in perchloric acid media at 25° C. Steady-state polarization curves were obtained for MIDA concentrations of 3.0·10-3M to 7.0.10-2 M in 0.05 M to 2.5 M perchloric acid. Carbon dioxide was produced and product analyses showed that the electrochemical oxidative decarboxylation involved only one carboxymethylene group. While the rates of decarboxylation were only slightly affected by changes in the concentration of MIDA over the range studied, they showed a pronounced dependence on pH. A series of cyclic voltammetry measurements did not indicate the formation of stable intermediates. A reaction sequence, which is correlated with metal-ion oxidation of MIDA in perchloric acid, is proposed. © by Akademische Verlagsgesellschaft, Wiesbaden 197

The Oxidative Decarboxylation Of Polyaminocarboxylic Acidm-VI¹ 1 Part V-See Reference 16. Reaction Of Diethylenetriaminepenta-acetic Acid With Cerium(IV) In Sulphuric Acid Media

The oxidation of diethylenetrianunepenta-acetic acid (DTPA) by Ce(IV) in sulphuric add was investigated spectrophotometrically by the stopped-flow technique. The rate of reaction is influenced by the acidity, but can be expressed by a simplified rate law {A figure is presented} At [H2SO4] below 0.75M the reaction proceeds stepwise as shown by formation of a 1:1 Ce(IV)-DTPA complex with measurable rate of formation and decay. At higher acid strengths, the formation of an intermediate is not evident. The rate is maximal in ~ 0.75M sulphuric add. The overall stoichiometry varies with time. © 1972