{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,18]],"date-time":"2026-05-18T18:27:21Z","timestamp":1779128841422,"version":"3.51.4"},"reference-count":63,"publisher":"Wiley","issue":"18","license":[{"start":{"date-parts":[[2017,5,11]],"date-time":"2017-05-11T00:00:00Z","timestamp":1494460800000},"content-version":"vor","delay-in-days":1,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Eur J Inorg Chem"],"published-print":{"date-parts":[[2017,5,10]]},"abstract":"<jats:p>Three 1,4,7\u2010triazacyclononane\u2010based (tacn\u2010based) ligands containing picolyl and picolinate pendant arms (no3py, no2pa1py, and no3pa) were synthesized, and their copper(II) complexation properties were studied to evaluate their potentials as chelators for copper radioisotopes. The thermodynamic stability constants of the complexes were determined by potentiometric titrations. These studies evidenced the formation of mononuclear species for no3py and mono\u2010 and dinuclear species for no2pa1py and no3pa. The pCu values decreased as the number of carboxypicolyl arms increased. The [Cu(no3py)]<jats:sup>2+<\/jats:sup> complex presented a very high stability constant (log\u2009<jats:italic>K<\/jats:italic><jats:sub>CuL<\/jats:sub> = 27.4) and a very high selectivity towards Zn<jats:sup>2+<\/jats:sup> ions (log\u2009<jats:italic>K<\/jats:italic><jats:sub>ZnL<\/jats:sub> = 17.25). Vis\/NIR (NIR = near\u2010infrared) absorption and electron paramagnetic resonance (EPR) spectroscopy indicated that the three complexes present distorted octahedral geometries with two paramagnetic species, which were identified as the \u0394(\u03b4\u03b4\u03b4) and \u039b(\u03b4\u03b4\u03b4) isomers [and their corresponding enantiomeric forms \u039b(\u03bb\u03bb\u03bb) and \u0394(\u03bb\u03bb\u03bb)] by DFT calculations. The electrochemical properties were investigated by cyclic voltammetry, which revealed quasireversible behavior for the [Cu(no3py)]<jats:sup>2+<\/jats:sup> complex but irreversible Cu<jats:sup>2+<\/jats:sup>\/Cu<jats:sup>+<\/jats:sup> systems for [Cu(no2pa1py)] and [Cu(no3pa)]<jats:sup>\u2013<\/jats:sup>.<\/jats:p>","DOI":"10.1002\/ejic.201700176","type":"journal-article","created":{"date-parts":[[2017,5,16]],"date-time":"2017-05-16T05:24:08Z","timestamp":1494912248000},"page":"2435-2443","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["1,4,7\u2010Triazacyclononane\u2010Based Bifunctional Picolinate Ligands for Efficient Copper Complexation"],"prefix":"10.1002","volume":"2017","author":[{"given":"Amaury","family":"Guillou","sequence":"first","affiliation":[{"name":"UMR\u2010CNRS 6521 Universit\u00e9 de Bretagne Occidentale  6 avenue Victor le Gorgeu, C.S. 93837 29238 Brest Cedex 3 France"}]},{"given":"Lu\u00eds M. 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