Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/10518
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dc.contributor.authorCortes, S.-
dc.contributor.authorBrucher, E.-
dc.contributor.authorGeraldes, C. F. G. C.-
dc.contributor.authorSherry, A. D.-
dc.date.accessioned2009-07-07T09:38:31Z-
dc.date.available2009-07-07T09:38:31Z-
dc.date.issued1990-01-
dc.identifier.citationInorganic Chemistry. 29:1 (1990) 5-9en_US
dc.identifier.issn0020-1669-
dc.identifier.urihttp://hdl.handle.net/10316/10518-
dc.description.abstractA new chelating macrocycle, 1,5,9-triazacyclododecane-N,N’,N’’-triacetiacc id (DOTRA), has been synthesized, and its complexes with Zn2’, Cd2+, Ca2+, Mg2+, and Mn2+ have been examined by potentiometry and NMR spectroscopy. The first protonation constant of the free ligand (log K, = 12.8) was determined spectrophotometrically, while the remaining were evaluated from potentiometric data (log K2 = 7.55, log K, = 3.65, log K4 = 2.1). DOTRA forms complexes with Mn2+, Mg2’, and Ca2+ rather slowly but reacts much more rapidly with Zn2+ and Cd2+. As reported previously for the nine-membered-ring triaza analogue NOTA, DOTRA also forms a more stable complex with Mg2+ than with Ca2+ (log K,, = 7.1 versus 6.0). High-resolution NMR spectra of the Zn2+, Cd2+, and Mgzt complexes (log K,, = 19.0, 15.7, and 7.1, respectively) indicate the three six-membered chelate rings are symmetrical and quite rigid in aqueous solution, as evidenced by nonequivalence of all six chelate ring protons.en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.rightsopenAccesseng
dc.titlePotentiometry and NMR studies of 1,5,9-triazacyclododecane-N,N',N''-triacetic acid and its metal ion complexesen_US
dc.typearticleen_US
dc.identifier.doi10.1021/ic00326a003-
uc.controloAutoridadeSim-
item.fulltextCom Texto completo-
item.grantfulltextopen-
item.languageiso639-1en-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.orcid0000-0002-0837-8329-
crisitem.author.orcid0000-0001-7150-8301-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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