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- Title
4f-Metal Clusters Exhibiting Slow Relaxation of Magnetization: A {Dy7} Complex with An Hourglass-like Metal Topology.
- Authors
Pantelis, Konstantinos N.; Perlepe, Panagiota S.; Grammatikopoulos, Spyridon; Lampropoulos, Christos; Tang, Jinkui; Stamatatos, Theocharis C.; Papatriantafyllopoulou, Constantina; Totti, Federico
- Abstract
The reaction between Dy(NO3)3∙6H2O and the bulky Schiff base ligand, N-naphthalidene-2-amino-5-chlorobenzoic acid (nacbH2), in the presence of the organic base NEt3 has led to crystallization and structural, spectroscopic and magnetic characterization of a new heptanuclear [Dy7(OH)6(OMe)2(NO3)1.5(nacb)2(nacbH)6(MeOH)(H2O)2](NO3)1.5 (1) compound in ~40% yield. Complex 1 has a unique hourglass-like metal topology, among all previously reported {Dy7} clusters, comprising two distorted {Dy4(μ3-OH)3(μ3-OMe)}8+ cubanes that share a common metal vertex (Dy2). Peripheral ligation about the metal core is provided by the carboxylate groups of four η1:η1:η1:μ single-deprotonated nacbH− and two η1:η1:η2:η1:μ3 fully-deprotonated nacb2− ligands. Complex 1 is the first structurally characterized 4f-metal complex bearing the chelating/bridging ligand nacbH2 at any protonation level. Magnetic susceptibility studies revealed that 1 exhibits slow relaxation of magnetization at a zero external dc field, albeit with a small energy barrier of ~5 K for the magnetization reversal, most likely due to the very fast quantum-tunneling process. The combined results are a promising start to further explore the reactivity of nacbH2 upon all lanthanide ions and the systematic use of this chelate ligand as a route to new 4f-metal cluster compounds with beautiful structures and interesting magnetic dynamics.
- Subjects
METAL complexes; MAGNETIZATION reversal; MAGNETIC structure; MAGNETIZATION; PROTON transfer reactions; SCHIFF bases; CHELATING agents; RARE earth metals
- Publication
Molecules, 2020, Vol 25, Issue 9, p2191
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules25092191