Browsing by Author "Christou, George"

Article

1-D coordination polymers consisting of a high-spin Mn17 octahedral unit

Moushi, Eleni E.; Stamatatos, Theocharis C.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2009)

The reaction of [Mn(O2CMe)2] · 4H2O with pdH2 (1,3-propanediol) or mpdH2 (2-methyl-1,3-propanediol) in the presence of NaN3 in MeCN/py (py = pyridine) results in the formation of two new one-dimensional coordination polymers ...

Article

4-(Hydroxymethyl)pyridine and pyrimidine in manganese benzoate chemistry: Preparation and characterization of hexanuclear clusters featuring the { Mn4II Mn2III ( μ4 - O )2 }10 + core

Stamatatos, Theocharis C.; Foguet-Albiol, D.; Perlepes, Spyros P.; Raptopoulou, Catherine P.; Terzis, Aris; Patrickios, Costas S.; Christou, George; Tasiopoulos, Anastasios J. (2006)

The use of 4-(hydroxymethyl)pyridine (4hmpH) and pyrimidine (pym) in manganese benzoate chemistry has been investigated. The reactions of 4hmpH and pym with Mn(O2CPh)2 · 2H2O in MeCN affords the complexes [Mn6O2(O2CPh)10(4hmpH) ...

Article

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 ...

Article

ChemInform Abstract: Filling the Gap Between the Quantum and Classical Worlds of Nanoscale Magnetism: Giant Molecular Aggregates Based on Paramagnetic 3d Metal Ions

Papatriantafyllopoulou, Constantina; Moushi, Eleni E.; Christou, George; Tasiopoulos, Anastasios J. (2016)

Article

Cyanate groups in higher oxidation state metal cluster chemistry: Mixed-valence (II/III) Mn16 and Mn18 clusters

Alexandropoulos, Dimitris I.; Moushi, Eleni E.; Papatriantafyllopoulou, Constantina; Beavers, Christine M.; Teat, Simon J.; Tasiopoulos, Anastasios J.; Christou, George; Stamatatos, Theocharis C. (2016)

Article

Cyanate groups in higher oxidation state metal cluster chemistry: Mixed-valence (II/III) Mn16 and Mn18 clusters

Alexandropoulos, Dimitris I.; Moushi, Eleni E.; Papatriantafyllopoulou, Constantina; Beavers, Christine M.; Teat, S. J.; Tasiopoulos, Anastasios J.; Christou, George; Stamatatos, Theocharis C. (2016)

The employment of cyanato (OCN-) group in high oxidation state manganese cluster chemistry, in conjunction with carboxylate ions and the organic chelating/bridging ligand 2-(hydroxymethyl)pyridine (hmpH), is reported. The ...

Article

Discrete and encapsulated molecular grids: Homometallic Mn15 and heterometallic Mn24Ni2 aggregates

Charalambous, Maria; Zartilas, Sotiris M.; Moushi, Eleni E.; Papatriantafyllopoulou, Constantina; Manos, Manolis J.; Stamatatos, Theocharis C.; Mukherjee, S.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2014)

Two molecular grid-like clusters are reported, one is a discrete [3 × 5] grid and the other a [3 × 4] grid within a Mn12Ni 2 loop. Both Mn24Ni2 and Mn15 aggregates display novel and aesthetically pleasing structures with ...

Article

Employment of methyl 2-pyridyl ketone oxime in manganese non-carboxylate chemistry: MnII2MnIV and MnII 2MnIII6 complexes

Stoumpos, Constantinos C.; Stamatatos, Theocharis C.; Sartzi, H.; Roubeau, O.; Tasiopoulos, Anastasios J.; Nastopoulos, Vassilios; Teat, S. J.; Christou, George; Perlepes, Spyros P. (2009)

The employment of the anion of methyl 2-pyridyl ketone oxime (mpko -) as a tridentate chelating/bridging ligand in manganese chemistry is described. The inorganic anion (Br-, ClO4-) used in the reaction affects the identity ...

Article

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 ...

Article

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 ...

Article

Filling the gap between the quantum and classical worlds of nanoscale magnetism: Giant molecular aggregates based on paramagnetic 3d metal ions

Papatriantafyllopoulou, Constantina; Moushi, Eleni E.; Christou, George; Tasiopoulos, Anastasios J. (2016)

In this review, aspects of the syntheses, structures and magnetic properties of giant 3d and 3d/4f paramagnetic metal clusters in moderate oxidation states are discussed. The term "giant clusters" is used herein to denote ...

Article

Filling the gap between the quantum and classical worlds of nanoscale magnetism: giant molecular aggregates based on paramagnetic 3d metal ions[ONLINE]

Papatriantafyllopoulou, Constantina; Moushi, Eleni E.; Christou, George; Tasiopoulos, Anastasios J. (2016)

Article

Giant Heterometallic [Mn36Ni4]0/2− and [Mn32Co8] “Loops-of-Loops-and-Supertetrahedra” Molecular Aggregates

Charalambous, Maria; Moushi, Eleni E.; Nguyen, Tu N.; Papatriantafyllopoulou, Constantina; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2019)

We report the synthesis, crystal structures and magnetic properties of the giant heterometallic [Mn36Ni4]2-/0 (compounds 1, 2) / [Mn32Co8] (compound 3) ‘loops-of-loops-and-supertetrahedra’ molecular aggregates and of a ...

Article

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) ...

Article

Heterometallic MnIII4Ln2 (Ln = Dy, Gd, Tb) Cross-Shaped Clusters and Their Homometallic MnIII4MnII2 Analogues

Savva, Maria; Skordi, Katerina; Fournet, A. D.; Thuijs, A. E.; Christou, George; Perlepes, Spyros P.; Papatriantafyllopoulou, Constantina; Tasiopoulos, Anastasios J. (2017)

The employment of di-2-pyridyl ketone, (py)2CO, in heterometallic Mn/4f and homometallic Mn cluster chemistry has yielded six MnIII4Ln2 and two MnIII4MnII2 structurally related clusters, namely, [Mn4Ln2O2{(py)2CO2}4(NO3) ...

Article

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 ...

Article

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 ...

Article

Homometallic {Mn10} and heterometallic {Mn6Ca4} supertetrahedra exhibiting an unprecedented {MnIII9MnII} oxidation state level and heterometal ions distribution

Skordi, Katerina; Papatriantafyllopoulou, Constantina; Zartilas, Sotiris; Poole, Katye M.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2018)

Two novel decametallic clusters displaying a supertetrahedral structural core are discussed, a homometallic compound [MnIII9MnII(μ4-O)4(μ3-OMe)3(btH)3(ed)3(PhCO2)6]·6Η2Ο (1·6Η2Ο) (btH3 = (±)-1,2,4-butanetriol

Article

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 ...

Article

Introducing Dimensionality to the Archetypical Mn12 Single-Molecule Magnet: A Family of [Mn12]n Chains

Corrales, S. A.; Cain, J. M.; Uhlig, K. A.; Mowson, A. M.; Papatriantafyllopoulou, Constantina; Peprah, M. K.; Ozarowski, A.; Tasiopoulos, Anastasios J.; Christou, George; Meisel, M. W.; Lampropoulos, Christos (2016)

The [Mn12O12(O2CR)16(L4)] family (R = various