| dc.contributor |
Pérez de Benito, Joaquín F. |
|
| dc.creator |
Nicolàs Rivasés, Joan |
|
| dc.date |
2017-09-29T16:09:37Z |
|
| dc.date |
2017-09-29T16:09:37Z |
|
| dc.date |
2017-06 |
|
| dc.date.accessioned |
2024-12-16T10:25:37Z |
|
| dc.date.available |
2024-12-16T10:25:37Z |
|
| dc.identifier |
http://hdl.handle.net/2445/116062 |
|
| dc.identifier.uri |
http://fima-docencia.ub.edu:8080/xmlui/handle/123456789/19761 |
|
| dc.description |
Treballs Finals de Grau de Química, Facultat de Química, Universitat de Barcelona, Any: 2017, Tutor: Joaquín F. Pérez de Benito |
|
| dc.description |
The complexation of chromium(III) by L-glutamic acid / hydrogen L-glutamate ion in aqueous media under slightly acidic conditions (pH 2.46 - 5.87) has been studied by the use of UV-Vis spectroscopy. Although the reaction in the presence of a large excess of organic ligand is considered in the chemical literature to be a pseudo-first order kinetic process, the rate-time plots corresponding to the formation of the reaction product show a distinct bell-shaped profile, caused by the accumulation of a long-lived intermediate. Given that this intermediate is not reactive enough for the steady state approximation to apply, an integrated rate law involving a double-exponential function has been used to obtain two rate constants for each kinetic experiment, corresponding to the formation of the long-lived intermediate from the reactants (k1) and to its decay into the reaction products (k2). Both rate constants increased with the initial concentration of hydrogen L-glutamate ion in a double-reciprocal linear relationship, k1 decreased with the ionic strength whereas k2 increased, both evidenced the existence of base catalysis and the corresponding activation energies were 83 ± 10 and 95 ± 5 kJ mol-1, respectively. The spectroscopic data indicated the formation of several complexes, differing in the number of organic ligands per chromium atom and in their acid-base properties. A mechanism in agreement with the available experimental data has been proposed, involving the breakage of a Cr(III)-aqua chemical bond as a previous step to the coordination of the organic ligand |
|
| dc.format |
60 p. |
|
| dc.format |
application/pdf |
|
| dc.language |
eng |
|
| dc.rights |
cc-by-nc-nd (c) Nicolàs, 2017 |
|
| dc.rights |
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
|
| dc.rights |
info:eu-repo/semantics/openAccess |
|
| dc.source |
Treballs Finals de Grau (TFG) - Química |
|
| dc.subject |
Crom |
|
| dc.subject |
Reaccions químiques |
|
| dc.subject |
Cinètica química |
|
| dc.subject |
Treballs de fi de grau |
|
| dc.subject |
Chromium |
|
| dc.subject |
Chemical reactions |
|
| dc.subject |
Chemical kinetics |
|
| dc.subject |
Bachelor's theses |
|
| dc.title |
Kinetic study of the complexation of chromium(III) by L-glutamic acid |
|
| dc.title |
Estudi cinètic de la complexació de crom(III) per l’àcid L-glutàmic |
|
| dc.type |
info:eu-repo/semantics/bachelorThesis |
|