{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,25]],"date-time":"2025-10-25T11:59:10Z","timestamp":1761393550221,"version":"build-2065373602"},"reference-count":31,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2007,3,13]],"date-time":"2007-03-13T00:00:00Z","timestamp":1173744000000},"content-version":"vor","delay-in-days":0,"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":[[2007,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Y\u2010encapsulated Cu<jats:sup>II<\/jats:sup>\u2013purine complexes were synthesized, characterized and studied in the catalytic oxidation of cyclohexene. Encapsulation was achieved by ion\u2010exchanging the complex from aqueous solutions containing both the purine ligand, 9\u2010methyl\u20106\u2010(methylamino)purine, and copper, in different pH, with a purine\/Cu<jats:sup>II<\/jats:sup> molar ratio of 5:1. The resulting materials were characterized by surface analysis (XPS, SEM and XRD), chemical analysis, spectroscopic methods (EPR, FTIR and UV\/Vis) and thermal analysis (TGA), which indicated that the Cu<jats:sup>II<\/jats:sup>\u2013purine complexes were effectively encapsulated in NaY, most probably inside the supercages, without any modification of the morphology and structure of the zeolite. Different Cu<jats:sup>II<\/jats:sup>\u2013purine complexes were formed, depending on the pH during synthesis. The coordination geometry of Y\u2010encapsulated Cu<jats:sup>II<\/jats:sup>\u2013purine complexes was obtained with preferentially 1:2 and 1:3 Cu\/L stoichiometry: complexes <jats:bold>A<\/jats:bold> and <jats:bold>B<\/jats:bold> (1:2) and complex <jats:bold>C<\/jats:bold> (1:3). Complex <jats:bold>A<\/jats:bold> was formed at pH \u2265 7, and complexes <jats:bold>B<\/jats:bold> and <jats:bold>C<\/jats:bold> (Scheme 2) were formed at pH = 5.4. Oxidation of cyclohexene with <jats:italic>t<\/jats:italic>BuOOH (TBHP) as the oxygen source, gave 2\u2010cyclohexene\u20101\u2010one, 2\u2010cyclohexene\u20101\u2010ol, cyclohexene oxide and 3\u2010<jats:italic>tert<\/jats:italic>\u2010butylcyclohexenyl peroxide. (\u00a9 Wiley\u2010VCH Verlag GmbH &amp; Co. KGaA, 69451 Weinheim, Germany, 2007)<\/jats:p>","DOI":"10.1002\/ejic.200601036","type":"journal-article","created":{"date-parts":[[2007,3,13]],"date-time":"2007-03-13T08:17:51Z","timestamp":1173773871000},"page":"1682-1689","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Copper(II)\u2013Purine Complexes Encapsulated in NaY Zeolite"],"prefix":"10.1002","volume":"2007","author":[{"given":"Nat\u00e9rcia","family":"Nunes","sequence":"first","affiliation":[]},{"given":"Raquel","family":"Amaro","sequence":"additional","affiliation":[]},{"given":"Filomena","family":"Costa","sequence":"additional","affiliation":[]},{"given":"Elisabetta","family":"Rombi","sequence":"additional","affiliation":[]},{"given":"M. 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