Show simple item record

dc.contributor.authorMishra, Abhudayaen
dc.contributor.authorTasiopoulos, Anastasios J.en
dc.contributor.authorWernsdorfer, W.en
dc.contributor.authorAbboud, K. A.en
dc.contributor.authorChristou, Georgeen
dc.creatorMishra, Abhudayaen
dc.creatorTasiopoulos, Anastasios J.en
dc.creatorWernsdorfer, W.en
dc.creatorAbboud, K. A.en
dc.creatorChristou, Georgeen
dc.description.abstractThe syntheses, structures, and magnetic properties are reported of the mixed-metal complexes [Ce4Mn10O10(OMe) 6(O2-CPh)16(NO3)2(MeOH) 2(H2O)2] (1) and [Th6Mn 10O22(OH)2(O2CPh) 16-(NO3)2(H2O)8] (2), which were both prepared by the reaction of (NBun4) [Mn4O2(O2CPh)9(H2O)] (3) with a source of the heterometal in MeCN/MeOH. Complexes 1 and 2 crystallize in the monoclinic space group C2/c and the triclinic space group P1, respectively. Complex 1 consists of 10 MnIII, 2 CeIV, and 2 Ce IV atoms and possesses a very unusual tubular [Ce4Mn 10O10(OMe)6]18+ core. Complex 2 consists of 10 MnIV and 6 ThIV atoms and possesses a [Th6Mn10O22(OH)2]18+ core with the metal atoms arranged in layers with a 2:3:6:3:2 pattern. Peripheral ligation around the cores is provided by 16 bridging benzoates, 2 chelating nitrates, and either (i) 2 each of terminal H2O and MeOH groups in 1 or (ii) 8 terminal H2O groups in 2. Complex 1 is the largest mixed-metal Ce/Mn cluster and the first 3d/4f cluster with mixed-valency in its lanthanide component, while complex 2 is the first Th/Mn cluster and the largest mixed transition metal/actinide cluster to date. Solid-state dc and ac magnetic susceptibility measurements on 1 and 2 establish that they possess S = 4 and 3 ground states, respectively. Ac susceptibility studies on 1 revealed nonzero frequency-dependent out-of-phase (χM″) signals at temperatures below 3 Ken
dc.description.abstractcomplex 2 displays no χM″ signals. However, single-crystal magnetization vs dc field scans at variable temperatures and variable sweep-rates down to 0.04 K on 1 revealed no noticeable hysteresis loops, except very minor ones at 0.04 K assignable to weak intermolecular interactions propagated by hydrogen bonds involving CeIII-bound ligands. Complex 1 is thus concluded not to be a single-molecule magnet (SMM), and the combined results thus represent a caveat against taking such ac signals as sufficient proof of a SMM. © 2007 American Chemical Society.en
dc.sourceInorganic chemistryen
dc.titleHigh-nuclearity Ce/Mn and Th/Mn cluster chemistry: Preparation of complexes with [Ce4Mn10O10(OMe)6] 18+ and [Th6Mn10O22(OH) 2]18+ coresen
dc.description.endingpage3115 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]

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record