Browsing by Author "Christou, George"
Now showing items 21-40 of 45
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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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Magnetic “Molecular Oligomers” Based on Decametallic Supertetrahedra: A Giant Mn49 Cuboctahedron and its Mn25Na4 Fragment
Manoli, Maria; Alexandrou, Sofia; Pham, Linh; Lorusso, Giulia; Wernsdorfer, Wolfgang; Evangelisti, Marco; Christou, George; Tasiopoulos, Anastasios J. (2015)
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Mixed transition metal-lanthanide complexes at high oxidation states: Heteronuclear CeIVMnIV clusters
Tasiopoulos, Anastasios J.; Milligan Jr., P. L.; Abboud, K. A.; O'Brien, T. A.; Christou, George (2007)The syntheses of the first mixed-metal CeIVMnIV complexes are reported. [CeMn2O3(O2CMe)(NO 3)4(H2O)2(bpy)2]-(NO 3) (1
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Mixed Transition-Metal - Lanthanide Complexes at Higher Oxidation States: Heteronuclear CeIV-MnIV Clusters
Tasiopoulos, Anastasios J.; O'Brien, T. A.; Abboud, K. A.; Christou, George (2004)Wheels within wheels: A new family of mixed cerium(IV)-manganese(IV) clusters has been prepared spanning a range of Ce:Mn ratios from 3:2 to 1:6. The unusual core of the latter CeMn6 complex is shown (Ce green, Mn blue, O ...
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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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[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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[Mn14] “Structural Analogues” of Well-Known [Mn12] Single-Molecule Magnets
Charalambous, Maria; Moushi, Eleni E.; Nguyen, Tu N.; Mowson, Andrew M.; Christou, George; Tasiopoulos, Anastasios J. (2018)A new family of tetradecanuclear Mn clusters [MnIII10MnIV4(µ3-O)12(EtCO2)12(pd)4(EtOH)4(py)4](ClO4)2 (1), [MnIII10MnIV4(µ3-O)12(EtCO2)12(mpd)4(EtOH)2(H2O)2(py)4](ClO4)2 (2), and [MnIII10MnIV4(µ3-O)12(MeCO2)10(pic)4(pd)4(pdH2)4] ...
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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 MnII6MnIII6 single-strand molecular wheel with a reuleaux triangular topology: Synthesis, structure, magnetism, and DFT studies
Zartilas, Sotiris M.; Papatriantafyllopoulou, Constantina; Stamatatos, Theocharis C.; Nastopoulos, Vassilios; Cremades, E.; Ruiz, E.; Christou, George; Lampropoulos, Christos; Tasiopoulos, Anastasios J. (2013)The use of the anion of 3-methyl-1,3,5-pentanetriol (mpt3-) in manganese carboxylate chemistry has afforded the new MnII/III 12 cluster [MnII6MnIII 6(mpt)6(CH3CO2)12(py) 6]·3CH3CN (1·3CH3CN). Complex 1 was isolated in ...
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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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A new family of octanuclear Mn complexes with a rod-like topology
Moushi, Eleni E.; Stamatatos, Theocharis C.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2009)Three new octanuclear compounds were prepared from reactions of [Mn(O2CR)2]·2H2O (R = Et or Ph) with the diols 1,3-propanediol (pdH2) or 2-methyl-1,3-propanediol (mpdH2) in the presence of NaN3. All three compounds ...
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New mixed-valence Mn6II/III complexes bearing oximato and azido ligands: Synthesis, and structural and magnetic characterization
Lampropoulos, Christos; Stamatatos, Theocharis C.; Manos, Manolis J.; Tasiopoulos, Anastasios J.; Abboud, K. A.; Christou, George (2010)The combined use of the anion of methyl 2-pyridyl ketone oxime (mpko -) and azides (N3-) in non-carboxylate Mn chemistry has afforded two new Mn6 clusters, [Mn6O 3(N3)3(mpko)6(H2O) 3](ClO4J2 (1) and [Mn6O3(N3) 5(mpko)6(H2O)] ...
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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 novel aggregate of [Mn2(μ-O)2] units: [Mn8O10(O2CMe)6(H2O) 2(bpy)6]4+ with a serpentine core
Tasiopoulos, Anastasios J.; Abboud, K. A.; Christou, George (2003)The synthesis, characterization and initial reactivity studies are reported of the mixed-valence (MnIV 6MnIII 2) title compound, which possesses an unusual serpentine-like core and is the highest average oxidation state ...
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Preparation and crystal structures of MnII, mixed-valent MnII/MnIII, and MnIII polymeric compounds
Tasiopoulos, Anastasios J.; Harden, N. C.; Abboud, K. A.; Christou, George (2003)The preparation and crystal structures of three polymeric Mn compounds are reported. The comproportionation reaction between Mn(OAc)2·4H2O and KMnO4 in MeOH-AcOH (2:3) leads to isolation of {[Mn(OH)(OAc)2]·AcOH·H2O}n (1). ...
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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
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Single-molecule magnets: A family of MnIII/CeIV complexes with a [Mn8CeO8]12+ core
Mishra, Abhudaya; Tasiopoulos, Anastasios J.; Wernsdorfer, W.; Moushi, Eleni E.; Moulton, B.; Zaworotko, M. J.; Abboud, K. A.; Christou, George (2008)Four 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 ...