4f-Metal Clusters Exhibiting Slow Relaxation of Magnetization: A {Dy 7 } Complex with An Hourglass-like Metal Topology
Gespeichert in:
| Titel: | 4f-Metal Clusters Exhibiting Slow Relaxation of Magnetization: A {Dy 7 } Complex with An Hourglass-like Metal Topology |
|---|---|
| Autoren: | Konstantinos N. Pantelis, Panagiota S. Perlepe, Spyridon Grammatikopoulos, Christos Lampropoulos, Jinkui Tang, Theocharis C. Stamatatos |
| Quelle: | Molecules, Vol 25, Iss 2191, p 2191 (2020) |
| Verlagsinformationen: | MDPI AG |
| Publikationsjahr: | 2020 |
| Bestand: | Directory of Open Access Journals: DOAJ Articles |
| Schlagwörter: | polynuclear metal complexes, dysprosium(III), Schiff base ligands, N -naphthalidene-2-amino-5-chlorobenzoic acid, single-crystal X-ray crystallography, single-molecule magnets, Organic chemistry, QD241-441 |
| Beschreibung: | The reaction between Dy(NO 3 ) 3 ∙6H 2 O and the bulky Schiff base ligand, N -naphthalidene-2-amino-5-chlorobenzoic acid (nacbH 2 ), in the presence of the organic base NEt 3 has led to crystallization and structural, spectroscopic and magnetic characterization of a new heptanuclear [Dy 7 (OH) 6 (OMe) 2 (NO 3 ) 1.5 (nacb) 2 (nacbH) 6 (MeOH)(H 2 O) 2 ](NO 3 ) 1.5 ( 1 ) compound in ~40% yield. Complex 1 has a unique hourglass-like metal topology, among all previously reported {Dy 7 } clusters, comprising two distorted {Dy 4 (μ 3 -ΟΗ) 3 (μ 3 -OMe)} 8+ cubanes that share a common metal vertex (Dy2). Peripheral ligation about the metal core is provided by the carboxylate groups of four η 1 :η 1 :η 1 :μ single-deprotonated nacbH − and two η 1 :η 1 :η 2 :η 1 :μ 3 fully-deprotonated nacb 2− ligands. Complex 1 is the first structurally characterized 4f-metal complex bearing the chelating/bridging ligand nacbH 2 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 nacbH 2 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. |
| Publikationsart: | article in journal/newspaper |
| Sprache: | English |
| Relation: | https://www.mdpi.com/1420-3049/25/9/2191; https://doaj.org/toc/1420-3049; https://doaj.org/article/55c8ba9fddb049a39fa93a0f5c223e0d |
| DOI: | 10.3390/molecules25092191 |
| Verfügbarkeit: | https://doi.org/10.3390/molecules25092191 https://doaj.org/article/55c8ba9fddb049a39fa93a0f5c223e0d |
| Dokumentencode: | edsbas.F706FD04 |
| Datenbank: | BASE |
Nájsť tento článok vo Web of Science | Abstract: | The reaction between Dy(NO 3 ) 3 ∙6H 2 O and the bulky Schiff base ligand, N -naphthalidene-2-amino-5-chlorobenzoic acid (nacbH 2 ), in the presence of the organic base NEt 3 has led to crystallization and structural, spectroscopic and magnetic characterization of a new heptanuclear [Dy 7 (OH) 6 (OMe) 2 (NO 3 ) 1.5 (nacb) 2 (nacbH) 6 (MeOH)(H 2 O) 2 ](NO 3 ) 1.5 ( 1 ) compound in ~40% yield. Complex 1 has a unique hourglass-like metal topology, among all previously reported {Dy 7 } clusters, comprising two distorted {Dy 4 (μ 3 -ΟΗ) 3 (μ 3 -OMe)} 8+ cubanes that share a common metal vertex (Dy2). Peripheral ligation about the metal core is provided by the carboxylate groups of four η 1 :η 1 :η 1 :μ single-deprotonated nacbH − and two η 1 :η 1 :η 2 :η 1 :μ 3 fully-deprotonated nacb 2− ligands. Complex 1 is the first structurally characterized 4f-metal complex bearing the chelating/bridging ligand nacbH 2 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 nacbH 2 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. |
|---|---|
| DOI: | 10.3390/molecules25092191 |