Browsing Τμήμα Χημείας / Department of Chemistry by Author "Wernsdorfer, W."
Now showing items 1-20 of 23
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Approaches to molecular magnetic materials from the use of cyanate groups in higher oxidation state metal cluster chemistry: Mn14 and Mn 16
Alexandropoulos, Dimitris I.; Papatriantafyllopoulou, Constantina; Li, C. -L; Cunha-Silva, L.; Manos, Manolis J.; Tasiopoulos, Anastasios J.; Wernsdorfer, W.; Christou, George; Stamatatos, Theocharis C. (2013)The initial employment of cyanato groups in higher oxidation state manganese cluster chemistry, in conjunction with the gem-diolate form of di-2-pyridylketone or 2,6-diacetylpyridine dioxime chelate ligands, has afforded ...
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Combining azide, carboxylate, and 2-pyridyloximate ligands in transition-metal chemistry: Ferromagnetic NiII 5clusters with a bowtie skeleton
Papatriantafyllopoulou, Constantina; Stamatatos, Theocharis C.; Wernsdorfer, W.; Teat, S. J.; Tasiopoulos, Anastasios J.; Escuer, Albert; Perlepes, Spyros P. (2010)The combined use of the anion of phenyl(2-pyridyl)ketone oxime (ppko-) and azides (N3 -) in nickel(II) carboxylate chemistry has afforded two new NiII 5clusters, [Ni5(O2CR′)2(N3)4(ppko)4(MeOH)4] [R′ = H (1), Me (2)]. The ...
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A family of 3D coordination polymers composed of Mn19 magnetic units
Moushi, Eleni E.; Stamatatos, Theocharis C.; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2006)(Figure Presented) Singles networks: The use of 1,3-propanediol and of 2-methyl-1,3-propanediol in manganese carboxylate chemistry leads to two new 3D coordination polymers with an unprecedented Mn19 repeating unit. The ...
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Field-sweep-rate dependence of the coercive field of single-molecule magnets: A classical approach with applications to the quantum regime
Wernsdorfer, W.; Murugesu, M.; Tasiopoulos, Anastasios J.; Christou, George (2005)A method, based on the Néel-Brown model of thermally activated magnetization reversal of a magnetic single-domain particle, is proposed to study the field-sweep-rate dependence of the coercive field of single-molecule ...
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Giant single-molecule magnets: A {Mn84} torus and its supramolecular nanotubes
Tasiopoulos, Anastasios J.; Vinslava, A.; Wernsdorfer, W.; Abboud, K. A.; Christou, George (2004)A meeting of two magnetic worlds: The giant (ca. 4.2 nm) {Mn84} cluster, shown, has a torus structure and is a single-molecule magnet (SMM). It represents a meeting of the molecular (bottom-up) and classical (top-down) ...
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A hexameric [Mn III 18 Na6] wheel based on [Mn III 3 O]7+ sub-units
Manoli, Maria; Inglis, R.; Piligkos, S.; Yanhua, L.; Wernsdorfer, W.; Brechin, E. K.; Tasiopoulos, Anastasios J. (2016)A novel hexameric [MnIII18Na6] wheel-like aggregate consisting of [MnIII3O] triangles is reported. It is the second highest nuclearity oxime-based Mn cluster, the largest member of the recently-developed family of molecular ...
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High nuclearity single-molecule magnets: A mixed-valence Mn26 cluster containing the di-2-pyridylketone diolate dianion
Stamatatos, Theocharis C.; Nastopoulos, Vassilios; Tasiopoulos, Anastasios J.; Moushi, Eleni E.; Wernsdorfer, W.; Christou, George; Perlepes, Spyros P. (2008)The employment of the dianion (dpkd2-) of the gem-diol form of di-2-pyridylketone (dpk) as a tetradentate chelate in manganese chemistry is reported, and the synthesis, crystal structure, and magnetochemical characterization ...
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High-nuclearity Ce/Mn and Th/Mn cluster chemistry: Preparation of complexes with [Ce4Mn10O10(OMe)6] 18+ and [Th6Mn10O22(OH) 2]18+ cores
Mishra, Abhudaya; Tasiopoulos, Anastasios J.; Wernsdorfer, W.; Abboud, K. A.; Christou, George (2007)The 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 ...
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Inducing single-molecule magnetism in a family of loop-of-loops aggregates: Heterometallic Mn40Na4 clusters and the homometallic Mn44 analogue
Moushi, Eleni E.; Lampropoulos, Christos; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2010)The syntheses, crystal structures, and magnetic properties of a new family of heterometallic Mn40Na4 and homometallic Mn44 loop-of-loops aggregates are reported. The reactions of [Mn3O(O 2CMe)6(py)3]•py with 1,3-propanediol ...
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A large [Mn10Na]4 loop of four linked Mn10 loops
Moushi, Eleni E.; Lampropoulos, Christos; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2007)A large [Mn10Na]4 loop-of-loops aggregate was prepared from the use of 1,3-propanediol (pdH2) in manganese carboxylate chemistry. It is constructed from four [Mn10(μ 3-O)2(O2CMe)13(pd) 6(py)2]- loops linked through Na+ ...
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Magnetic "Molecular Oligomers" Based on Decametallic Supertetrahedra: A Giant Mn49 Cuboctahedron and its Mn25Na4 Fragment
Manoli, Maria; Alexandrou, Sofia; Pham, L.; Lorusso, G.; Wernsdorfer, W.; Evangelisti, M.; Christou, George; Tasiopoulos, Anastasios J. (2016)Two nanosized Mn49 and Mn25Na4 clusters based on analogues of the high-spin (S=22) [MnIII 6MnII 4(μ4-O)4]18+ supertetrahedral core are reported. Mn49 and Mn25Na4 complexes consist of eight and four decametallic supertetrahedral ...
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A Mn 17 octahedron with a giant ground-state spin: Occurrence in discrete Form and as Multidimensional coordination polymers
Moushi, Eleni E.; Stamatatos, Theocharis C.; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2009)A [Mn lll 11Mn ll 6(μ 4-O) 8(μ 3-L) 4] 25+ (L = N 3 - or OCN -) octahedral unit is reported, occurring within 1D (1)∞ and 2D (2)∞ coordination polymers, as well as the corresponding 0D discrete cluster 3. It possesses a ...
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A Mn 36Ni 4 'loop-of-loops-and-supertetrahedra' aggregate possessing a high S T = 26 ± 1 spin ground state
Charalambous, Maria; Moushi, Eleni E.; Papatriantafyllopoulou, Constantina; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2012)The initial use of 1,3-propanediol in mixed Mn/3d cluster chemistry has led to a Mn III 28Mn II 8Ni II 4 molecular aggregate which consists of two Mn III 8Ni 2 loops and two Mn III 6Mn II 4 supertetrahedral units and ...
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Article
[Mn12O12(OMe)2(O2CPh) 16(H2O)2]2- single-molecule magnets and other manganese compounds from a reductive aggregation procedure
Tasiopoulos, Anastasios J.; Wernsdorfer, W.; Abboud, K. A.; Christou, George (2005)A new synthetic procedure has been developed in Mn cluster chemistry involving reductive aggregation of permanganate (MnO4-) ions in MeOH in the presence of benzoic acid, and the first products from its use are described. ...
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A Mn15 single-molecule magnet consisting of a supertetrahedron incorporated in a loop
Moushi, Eleni E.; Masello, A.; Wernsdorfer, W.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2010)Two new Mn15 clusters consisting of a supertetrahedron which is incorporated in a loop are reported. The reactions of [Mn(O2CEt) 2]·2H2O with the diols 1,3-propanediol (H 2pd) or 2-methyl-1,3-propanediol (H2mpd) in the ...
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A [Mn32] double-decker wheel
Manoli, Maria; Inglis, R.; Manos, Manolis J.; Nastopoulos, Vassilios; Wernsdorfer, W.; Brechin, E. K.; Tasiopoulos, Anastasios J. (2011)Inventing the double wheel: A mixed-valent [Mn32] cluster with a very rare "double-decker" wheel topology (see its metal-oxygen core: MnIII blue, MnII pink, O red) is reported. It is by far the highest-nuclearity example ...
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Molecules at the Quantum-Classical Nanoparticle Interface: Giant Mn70 Single-Molecule Magnets of ∼4 nm Diameter
Vinslava, A.; Tasiopoulos, Anastasios J.; Wernsdorfer, W.; Abboud, K. A.; Christou, George (2016)Two Mn70 torus-like molecules have been obtained from the alcoholysis in EtOH and 2-ClC2H4OH of [Mn12O12(O2CMe)16(H2O)4]·4H2O·2MeCO2H (1) in the presence of NBun4MnO4 and an excess of MeCO2H. The reaction in EtOH afforded ...
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Article
Nickel/lanthanide single-molecule magnets: {Ni3Ln} "stars" with a ligand derived from the metal-promoted reduction of di-2-pyridyl ketone under solvothermal conditions
Efthymiou, Constantinos G.; Stamatatos, Theocharis C.; Papatriantafyllopoulou, Constantina; Tasiopoulos, Anastasios J.; Wernsdorfer, W.; Perlepes, Spyros P.; Christou, George (2010)Unusual {NiII3LnIII(μ-OR) 6}3+ complexes with a "star" topology have been prepared with ligands derived from the metal-promoted reduction of di-2-pyridyl ketone under solvothermal conditions
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A reductive-aggregation route to [Mn12O12(OMe) 2(O2CPh)16(H2O)2] 2- single-molecule magnets related to the [Mn12] family
Tasiopoulos, Anastasios J.; Wernsdorfer, W.; Abboud, K. A.; Christou, George (2004)Axes of power: Jahn-Teller isomerism (that is, Jahn-Teller distortion along different axes) accounts for the presence of both faster and slower relaxing magnetization dynamics of the title compound (see core structure
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The search for cobalt single-molecule magnets: A disk-like Co IIICoII 6 cluster with a ligand derived from a novel transformation of 2-acetylpyridine
Kitos, Alexandros A.; Efthymiou, Constantinos G.; Papatriantafyllopoulou, Constantina; Nastopoulos, Vassilios; Tasiopoulos, Anastasios J.; Manos, Manolis J.; Wernsdorfer, W.; Christou, George; Perlepes, Spyros P. (2011)The 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 described