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dc.contributor.authorMishra, Abhudayaen
dc.contributor.authorTasiopoulos, Anastasios J.en
dc.contributor.authorWernsdorfer, W.en
dc.contributor.authorMoushi, Eleni E.en
dc.contributor.authorMoulton, B.en
dc.contributor.authorZaworotko, M. J.en
dc.contributor.authorAbboud, K. A.en
dc.contributor.authorChristou, Georgeen
dc.creatorMishra, Abhudayaen
dc.creatorTasiopoulos, Anastasios J.en
dc.creatorWernsdorfer, W.en
dc.creatorMoushi, Eleni E.en
dc.creatorMoulton, B.en
dc.creatorZaworotko, M. J.en
dc.creatorAbboud, K. A.en
dc.creatorChristou, Georgeen
dc.description.abstractFour heterometallic, enneanuclear Mn8Ce clusters [Mn 8CeO8(O2CMe)12(H2O) 4] (4), [Mn8CeO8(O2CMe) 12(py)4] (5), [Mn8CeO8(O 2CPh)12(MeCN)4] [Mn8CeO 8(O2CPh)12(dioxane)4] (6), and [Mn8CeO8(O2CCHPh2) 12(H2O)4] (7) have been prepared by various methods. Their cores are essentially isostructural and comprise a nonplanar, saddlelike [MnIII8O8]8+ loop containing a central CeIV ion attached to the eight μ3-O2- ions. Peripheral ligation around the [Mn 8CeO8]12+ core is provided by eight μ- and four μ3-O2CR- groups. Terminal ligation on four MnIII atoms is provided by H2O in 4 and 7, pyridine in 5, and MeCN/dioxane in 6. Solid-state magnetic susceptibility studies, fits of dc magnetization vs field and temperature data, and in-phase ac susceptibility studies in a zero dc field have established that complexes 4, 5, and 7 possess S = 16, S = 4 or 5, and S = 6 ± 1 spin ground states, respectively, but in all cases there are very low-lying excited states. The large variation in the ground-state spins for this isostructural family is rationalized as due to a combination of weak exchange interactions between the constituent MnIII atoms, and the presence of both nearest-neighbor and next-nearest-interactions of comparable magnitudes. Magnetization vs applied dc field sweeps on single crystals of 4·4H2O and 7·4H2O·3MeCN·2CH2Cl2 down to 0.04 K have established that these two complexes are new single-molecule magnets (SMMs). The former also shows an exchange-bias, a perturbation of its single-molecule properties from very weak intermolecular interactions mediated by hydrogen-bonding interactions with lattice-water molecules of crystallization. © 2008 American Chemical Society.en
dc.sourceInorganic chemistryen
dc.titleSingle-molecule magnets: A family of MnIII/CeIV complexes with a [Mn8CeO8]12+ coreen
dc.description.endingpage4843 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied SciencesΤμήμα Χημείας / Department of Chemistry
dc.description.notes<p>Cited By :55</p>en
dc.contributor.orcidTasiopoulos, Anastasios J. [0000-0002-4804-3822]

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