RT journal article
T1 Equilibrium and kinetic studies on complex formation and decomposition and the movement of Cu2+metal ions within polytopic receptors
A1 Castillo González, Carmen Esther
A1 González-García, Jorge
A1 Llinares, José M.
A1 Máñez Muñoz, María Ángeles
A1 R. Jimenez, Hermas
A1 García España, Enrique
A1 García Basallote, Manuel
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
AB Potentiometric studies carried out on the interaction of two tritopic double-scorpiand receptors in which two equivalent 5-(2-aminoethyl)-2,5,8-triaza[9]-(2,6)-pyridinophane moieties are linked with 2,9- dimethylphenanthroline (L1) and 2,6-dimethylpyridine (L2) establish the formation of mono-, bi- and trinuclear Cu2+ complexes. The values of the stability constants and paramagnetic 1H NMR studies permit one to infer the most likely coordination modes of the various complexes formed. Kinetic studies on complex formation and decomposition have also been carried out. Complex formation occurs with polyphasic kinetics for both receptors, although a significant difference is found between both ligands with respect to the relative values of the rate constants for the metal coordination steps and the structuralreorganizations following them. Complex decomposition occurs with two separate kinetic steps, the first one being so fast that it occurs within the stopped-flow mixing time, whereas the second one is slow enough to allow kinetic studies using a conventional spectrophotometer. As a whole, the kinetic experiments also provide information about the movement of the metal ion within the receptors. The differences observed between the different receptors can be interpreted in terms of changes in the network of hydrogen bonds formed in the different species.
PB RSC Publishing
YR 2013
FD 2013
LK http://hdl.handle.net/10498/20485
UL http://hdl.handle.net/10498/20485
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026