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Modulating the relaxation dynamics of the Na2Mn3 system via an auxiliary anion change.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 11/7/2021, Vol. 50 Issue 41, p14774-14781, 8p
- Publication Year :
- 2021
-
Abstract
- This paper reports two closely related heteropentanuclear manganese complexes, namely, {Na<subscript>2</subscript>Mn<subscript>3</subscript>(opch)<subscript>3</subscript>(μ<subscript>4</subscript>-O)(μ<subscript>2</subscript>-N<subscript>3</subscript>) (μ<subscript>2</subscript>-AcO)(μ<subscript>2</subscript>-MeO)}·6CH<subscript>3</subscript>OH·0.5H<subscript>2</subscript>O (1) and {Na<subscript>2</subscript>Mn<subscript>3</subscript>(opch)<subscript>3</subscript>(μ<subscript>4</subscript>-O)(μ<subscript>2</subscript>-N<subscript>3</subscript>)<subscript>2</subscript>(μ<subscript>2</subscript>-AcO)}·2.5CH<subscript>3</subscript>OH·2H<subscript>2</subscript>O (2), where H<subscript>2</subscript>opch is (E)-N′-(2-hydroxy-3-methoxybenzylidene)pyrazine-2-carbohydrazide. Single-crystal X-ray diffraction analysis reveals that the trigonal bipyramidal skeletons in both complexes are comparable, where a perfect triangular Mn<subscript>3</subscript> motif occupies the equatorial plane. Magnetic investigations suggest that overall antiferromagnetic coupling is present within the triangles of 1 and 2. However, their dynamic magnetic properties are drastically distinct. Indeed, complexes 1 and 2 show two kinds of dual slow magnetic relaxation processes that correspond to anisotropy barriers (Δ) of 9.2 cm<superscript>−1</superscript> (11.4 cm<superscript>−1</superscript> for 2) and 12.8 cm<superscript>−1</superscript> (30.0 cm<superscript>−1</superscript> for 2) for the low- and high-frequency domains, respectively. More importantly, a further comparative study of the structure and magnetism indicates that the coordination sphere of these two model complexes with the homologous hydrazone-based coordination sites undergoes an alteration from methoxide-O to azide-N upon a subtle change of the auxiliary anion accompanied by modulating octahedron geometries, leading to a further influence on different relaxation dynamics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 50
- Issue :
- 41
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 153243633
- Full Text :
- https://doi.org/10.1039/d1dt01237a