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dc.contributor.authorVaiana, Lea
dc.contributor.authorPlatas-Iglesias, Carlos
dc.contributor.authorEsteban-Gómez, David
dc.contributor.authorAvecilla, Fernando
dc.contributor.authorClemente-Juan, Juan Modesto
dc.contributor.authorReal, José Antonio
dc.contributor.authorBlas, Andrés de
dc.contributor.authorRodríguez-Blas, Teresa
dc.date.accessioned2017-10-27T10:20:35Z
dc.date.available2017-10-27T10:20:35Z
dc.date.issued2005-04-27
dc.identifier.citationDesigning binuclear transition metal complexes: a new example of the versatility of N,N′-bis(2- aminobenzyl)-4,13-diaza-18-crown-6. L. Vaiana, C. Platas-Iglesias, D. Esteban-Gómez, F. Avecilla, J. M. Clemente-Juan, J. A. Real, A. de Blas and T. Rodríguez-Blas, Dalt. Trans., 2005, 2031–2037.es_ES
dc.identifier.issn1477-9226
dc.identifier.issn1477-9234
dc.identifier.urihttp://hdl.handle.net/2183/19644
dc.description.abstract[Abstract] N,N′-Bis(2-aminobenzyl)-4,13-diaza-18-crown-6 (L) is a versatile receptor able to adapt to the coordinative preferences of different metal cation guests. With first-row transition metal ions, L tends to form binuclear complexes but, depending on the nature of the particular metal ion, the structure of the binuclear complex may be very different. Herein we report a study of the structure and magnetic properties of the corresponding nickel(II) and cobalt(II) complexes. The X-ray crystal structure of the nickel complex (1), with formula [Ni2(L)(CH3CN)4](ClO4)4·CH3CN, shows that this compound presents a symmetric coordination environment with L adopting an anti arrangement. Each Ni(II) ion is six-coordinate in a distorted octahedral environment, and both metal ions are quite far from each other. On the other hand, the X-ray crystal structure of the cobalt complex (2), with formula [Co(L)(μ-OH)Co(CH3CN)](ClO4)3, reveals a rather different structure. Coordination number asymmetry is found: one of the Co(II) is five-coordinate in a distorted trigonal-bipyramidal coordination environment, while the second Co(II) ion is six-coordinate in a distorted octahedral arrangement. Now L adopts a syn arrangement and a hydroxide group acts as a bridge between both cobalt ions. This hydroxo-bridged Co(II) binuclear complex shows structural features that mimic the active site of methionine aminopeptidases. The magnetic properties of 1 and 2 have been investigated in the temperature range 2.0–300 K. Whereas 1 displays a Curie law except for temperatures below 50 K where zero-field splitting of the S = 1 ground state is observed, antiferromagnetic exchange in the singular asymmetric binuclear Co(II) complex 2 has been observed. This magnetic behaviour has been fitted considering first-order spin–orbit coupling in the assumed axially distorted octahedral site and totally quenched orbital contribution in the five-coordinate site in which zero-field splitting of the S = 3/2 ground state is operative.es_ES
dc.description.sponsorshipGalicia. Consellería de Innovación, Industria e Comercio; PGIDIT03TAM10301PRes_ES
dc.description.sponsorshipMinisterio de Educación y Ciencia; CTQ 2004-03456es_ES
dc.language.isoenges_ES
dc.publisherRoyal Society of Chemistryes_ES
dc.relation.urihttps://doi.org/10.1039/B503151Fes_ES
dc.subjectMacrocyclic ligandses_ES
dc.subjectCrystal structureses_ES
dc.subjectBinuclear complexeses_ES
dc.subjectCrown etherses_ES
dc.subjectTransition-metal complexeses_ES
dc.titleDesigning binuclear transition metal complexes: a new example of the versatility of N,N′-bis(2-aminobenzyl)-4,13-diaza-18-crown-6es_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.accessinfo:eu-repo/semantics/openAccesses_ES
UDC.journalTitleDalton Transactionses_ES
UDC.issue11es_ES
UDC.startPage2031es_ES
UDC.endPage2037es_ES


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