The search for cobalt single-molecule magnets: A disk-like (CoCo6II)-Co-III cluster with a ligand derived from a novel transformation of 2-acetylpyridine

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dc.contributor.authorKitos, A. A.en
dc.contributor.authorEfthymiou, C. G.en
dc.contributor.authorPapatriantafyllopoulou, C.en
dc.contributor.authorNastopoulos, V.en
dc.contributor.authorTasiopoulos, A. J.en
dc.contributor.authorManos, M. J.en
dc.contributor.authorWernsdorfer, W.en
dc.contributor.authorChristou, G.en
dc.contributor.authorPerlepes, S. P.en
dc.date.accessioned2015-11-24T16:51:11Z
dc.date.available2015-11-24T16:51:11Z
dc.identifier.issn0277-5387-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/9701
dc.rightsDefault Licence-
dc.subjectcobalt single-molecule magnetsen
dc.subjectcrossed-aldol reactionen
dc.subjectheptanuclear (coco6iii)-co-ii clustersen
dc.subjectligands transformationsen
dc.subjectmagnetic propertiesen
dc.subject2-(pyridine-2-yl)pentane-2-olate-4-oneen
dc.subjectliganden
dc.subjecthigh-spin moleculesen
dc.subjectmanganese carboxylate chemistryen
dc.subjectmixed-valence cobalt(ii/iii)en
dc.subject2-pyridyl ketone oximeen
dc.subjectdi-2-pyridyl ketoneen
dc.subjectcoordination polymeren
dc.subjectcrystal-structuresen
dc.subjectground-stateen
dc.subjectmn-clusteren
dc.subjectcomplexesen
dc.titleThe search for cobalt single-molecule magnets: A disk-like (CoCo6II)-Co-III cluster with a ligand derived from a novel transformation of 2-acetylpyridineen
heal.abstractThe initial employment of 2-acetylpyridine, (py)(Me)CO, in Co cluster chemistry is reported, and the synthesis, crystal structure, and full magnetic study of [Co-7(OH)(6)(L)(6)](ClO4)(3)center dot 1.6H(2)O (1.1.6H(2)O) are described: L- is the anion of 2-(pyridine-2-yl)pentane-2-ol-4-one, (py)(Me)C(CH2COCH3)(O)(-), formed in situ through a crossed-aldol reaction in acetone under strongly basic conditions. The reaction of Co(ClO4)(2)center dot 6H(2)O, (POMe)CO and (NBu4OMe)-O-II (1:1:1.2) in acetone at room temperature under aerobic conditions affords 1.1.6H(2)O in 35% yield. The mixed-valent cation possesses a wheel-shaped (or disk-like) structural motif comprising a central octahedral Co-III atom linked to six peripheral distorted octahedral Co-II atoms by six mu(3)-OII- groups: the six Co-II atoms on the rim are held together by six eta(1):eta(1):eta(1):mu(2).L- ligands and the oxygen atoms of the hydroxo groups. Variable-temperature, solid-state dc and ac magnetic susceptibility studies were carried out on 1. The dc magnetic study of 1 shows a decline in the product chi(T)(M) with decreasing T. The observation of out-of phase (chi ''(M)) ac susceptibility signals below similar to 4 K suggests that the CoIIICo6II complex may be a single molecule magnet, and this was confirmed by single-crystal magnetization vs. dc field sweeps down to 0.04 K that exhibited hysteresis. The study reveals that each complex cation is a weak single-molecule magnet, but that there are also intermolecular interactions (also confirmed crystallographically) to create a 3D ordered lattice: this still gives some hysteresis at 5 K. (C) 2011 Elsevier Ltd. All rights reserved.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.primaryDOI 10.1016/j.poly.2011.02.013-
heal.identifier.secondary<Go to ISI>://000298522800006-
heal.identifier.secondaryhttp://ac.els-cdn.com/S0277538711000957/1-s2.0-S0277538711000957-main.pdf?_tid=69a02f66-3636-11e3-a0e8-00000aacb361&acdnat=1381909488_11c6532f82feac2e4246624bded1d628-
heal.journalNamePolyhedronen
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2011-
heal.publisherElsevieren
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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