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Your search keyword '"Alexandropoulos, Dimitris"' showing total 17 results
Start Over Author "Alexandropoulos, Dimitris" Publisher elsevier bv
17 results on '"Alexandropoulos, Dimitris"'

1. Enhanced coherence by coupling spins through a delocalized π-system: Vanadyl porphyrin dimers

Author

Pozo, Iago, primary, Huang, Zhijie, additional, Lombardi, Federico, additional, Alexandropoulos, Dimitris I., additional, Kong, Fanmiao, additional, Slota, Michael, additional, Tkach, Igor, additional, Bennati, Marina, additional, Deng, Jie-Ren, additional, Stawski, Wojciech, additional, Horton, Peter N., additional, Coles, Simon J., additional, Myers, William K., additional, Bogani, Lapo, additional, and Anderson, Harry L., additional

Published
2023
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6. Cyanate groups in higher oxidation state metal cluster chemistry: Mixed-valence (II/III) Mn16 and Mn18 clusters

Author

Alexandropoulos, Dimitris I., Moushi, Eleni E., Papatriantafyllopoulou, Constantina, Beavers, Christine M., Teat, Simon J., Tasiopoulos, Anastasios J., Christou, George, Stamatatos, Theocharis C., Tasiopoulos, Anastasios J. [0000-0002-4804-3822], Alexandropoulos, Dimitris I. [0000-0002-8759-9495], Papatriantafyllopoulou, Constantina [0000-0002-5652-7747], and Stamatatos, Theocharis C. [0000-0002-9798-9331]

Subjects
Anorganische chemie, Stereochemistry, 2-(Hydroxymethyl)pyridine, Cluster chemistry, Crystal structure, Chimie inorganique, 010402 general chemistry, 01 natural sciences, Medicinal chemistry, Inorganic Chemistry, chemistry.chemical_compound, Pyridine, Materials Chemistry, Hydroxymethyl, Carboxylate, Physical and Theoretical Chemistry, Isostructural, Périodiques, Cyanates, Organometaalverbindingen, Manganese, 010405 organic chemistry, Magnetism, Bridging ligand, Chemistry, Inorganic, Cyanate, 0104 chemical sciences, chemistry, Crystal structures, Inorganic & Nuclear Chemistry, Other Chemical Sciences, Physical Chemistry (incl. Structural)
Abstract

ID: 1135 In: Polyhedron, 131-142. Summary: Graphical abstractThe combination of cyanate, carboxylate and 2-(hydroxymethyl)pyridine ligands in higher oxidation state Mn cluster chemistry has led to two different families of MnII/III16and MnII/III18clusters with interesting topologies and nanoscale dimensions.AbstractThe 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 syntheses, crystal structures, and magnetochemical characterization are described for [Mn16O8(OR)4(OCN)4(O2CMe)12(hmp)6(ROH)2] (R = Me (1), Et (2)) and [Mn18O14(O2CR)18(hmp)4(hmpH)2(H2O)2] (R = Me (3), Et (4)). The 2:1:1:1 reactions of Mn(O2CMe)2·4H2O, hmpH, NaOCN and NEt3in solvent MeOH or EtOH afford the isostructural complexes [Mn16O8(OR)4(OCN)4(O2CMe)12(hmp)6(ROH)2] (R = Me (1), Et (2)). The [Mn16(μ4-O)4(μ3-O)4(μ-OMe)4(μ3-OR)6(μ-OR)6]10+core of representative complex1comprises a MnII4MnIII4double-cubane subunit attached on either side to two symmetry-related MnIIMnIII3defective dicubanes. A similar reaction of Mn(O2CR)2·4H2O, hmpH, NaOCN and NEt3, but in solvent MeCN, led instead to the formation of [Mn18O14(O2CR)18(hmp)4(hmpH)2(H2O)2] (R = Me (3), Et (4)). Compounds3and4are very similar to each other and can be described as a central [MnIII4(μ-O)6] rodlike subunit attached on either side to two symmetry-related [Mn7O9] subunits. Variable-temperature, solid-state dc and ac magnetic susceptibility studies revealed the presence of predominant antiferromagnetic exchange interactions in all compounds, and possibleS = 2 or 1 (for1and2) andS = 0 (for3and4) ground state spin values. The combined results demonstrate the ability of cyanato groups to facilitate the formation of new polynuclear MnII/IIIcomplexes with structures different than these obtained from the use of the related azides.

Published
2016
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