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dc.contributor.authorKitos, Alexandros A.en
dc.contributor.authorEfthymiou, Constantinos G.en
dc.contributor.authorPapatriantafyllopoulou, Constantinaen
dc.contributor.authorNastopoulos, Vassiliosen
dc.contributor.authorTasiopoulos, Anastasios J.en
dc.contributor.authorManos, Manolis J.en
dc.contributor.authorWernsdorfer, W.en
dc.contributor.authorChristou, Georgeen
dc.contributor.authorPerlepes, Spyros P.en
dc.creatorKitos, Alexandros A.en
dc.creatorEfthymiou, Constantinos G.en
dc.creatorPapatriantafyllopoulou, Constantinaen
dc.creatorNastopoulos, Vassiliosen
dc.creatorTasiopoulos, Anastasios J.en
dc.creatorManos, Manolis J.en
dc.creatorWernsdorfer, W.en
dc.creatorChristou, Georgeen
dc.creatorPerlepes, Spyros P.en
dc.description.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 [Co7(OH)6(L)6](ClO4) 3·1.6H2O (1·1.6H2O) are describeden
dc.description.abstractL- 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)2·6H2O, (py)(Me)CO and NBun 4OMe (1:1:1.2) in acetone at room temperature under aerobic conditions affords 1·1.6H2O in 35% yield. The mixed-valent cation possesses a wheel-shaped (or disk-like) structural motif comprising a central octahedral CoIII atom linked to six peripheral distorted octahedral CoII atoms by six μ3- ΟΗ- groupsen
dc.description.abstractthe six CoII atoms on the rim are held together by six η1:η1:η1: μ2·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 χΜT with decreasing T. The observation of out-of phase (χ″Μ) ac susceptibility signals below ∼4 K suggests that the CoIIICoII 6 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 latticeen
dc.description.abstractthis still gives some hysteresis at 5 K. © 2011 Elsevier B.V. All rights reserved.en
dc.subjectMagnetic propertiesen
dc.subject2-(Pyridine-2-yl)pentane-2-olate-4-one liganden
dc.subjectCobalt single-molecule magnetsen
dc.subjectCrossed-aldol reactionen
dc.subjectHeptanuclear Co IICoIII 6 clustersen
dc.subjectLigands' transformationsen
dc.titleThe search for cobalt single-molecule magnets: A disk-like Co IIICoII 6 cluster with a ligand derived from a novel transformation of 2-acetylpyridineen
dc.description.endingpage2996 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied SciencesΤμήμα Χημείας / Department of Chemistry
dc.contributor.orcidTasiopoulos, Anastasios J. [0000-0002-4804-3822]
dc.contributor.orcidPapatriantafyllopoulou, Constantina [0000-0002-5652-7747]
dc.contributor.orcidNastopoulos, Vassilios [0000-0003-4190-1342]
dc.contributor.orcidKitos, Alexandros A. [0000-0002-1431-3206]

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