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dc.contributor.authorCastillo González, Carmen Esther 
dc.contributor.authorMáñez Muñoz, María Ángeles 
dc.contributor.authorGarcía Basallote, Manuel 
dc.contributor.authorClares, M. Paz
dc.contributor.authorGarcía España, Enrique
dc.contributor.authorBlasco, Salvador
dc.contributor.otherCiencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánicaen_US
dc.date.accessioned2018-05-14T12:20:44Z
dc.date.available2018-05-14T12:20:44Z
dc.date.issued2012
dc.identifier.urihttp://hdl.handle.net/10498/20507
dc.description.abstractThe formation of Cu(II) complexes with two isomeric quinoline-containing scorpiand-type ligands has been studied. The ligands have a tetraazapyridinophane core appended with an ethylamino tail including 2-quinoline (L1) or 4-quinoline (L2) functionalities. Potentiometric studies indicate the formation of stable CuL2+ species with both ligands, the L1 complex being 3–4 log units more stable than the L2 complex. The crystal structure of [Cu(L1)](ClO4)2·H2O shows that the coordination geometry around the Cu2+ ions is distorted octahedral with significant axial elongation; the four Cu–N distances in the equatorial plane vary from 1.976 to 2.183 Å, while the axial distances are of 2.276 and 2.309 Å. The lower stability of the CuL22+ complex and its capability of forming protonated and hydroxo complexes suggest a penta-dentate coordination of the ligand, in agreement with the type of substitution at the quinoline ring. Kinetic studies on complex formation can be interpreted by considering that initial coordination of L1 and L2 takes place through the nitrogen atom in the quinoline ring. This is followed by coordination of the remaining nitrogen atoms, in a process that is faster in the L1 complex probably because substitution at the quinoline ring facilitates the reorganization. Kinetic studies on complex decomposition provide clear evidence on the occurrence of the molecular motion typical of scorpiands in the case of the L2 complex, for which decomposition starts with a very fast process (sub-millisecond timescale) that involves a shift in the absorption band from 643 to 690 nm.en_US
dc.formatapplication/pdfen_US
dc.language.isoengen_US
dc.publisherThe Royal Society of Chemistry and Owner Societiesen_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.sourceDalton Transactions 2012, 41, 5617en_US
dc.titleCopper(II) complexes of quinoline polyazamacrocyclic scorpiand-type ligands: X-ray, equilibrium and kinetic studiesen_US
dc.typeinfo:eu-repo/semantics/articleen_US
dc.identifier.doi10.1039/c2dt30223c


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Attribution-NonCommercial-NoDerivatives 4.0 Internacional
This work is under a Creative Commons License Attribution-NonCommercial-NoDerivatives 4.0 Internacional