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Slow magnetic relaxation in mononuclear octa-coordinate Fe(II) and Co(II) complexes from a Bpybox ligand.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 6/14/2022, Vol. 51 Issue 22, p8865-8873, 9p
- Publication Year :
- 2022
-
Abstract
- Two 3d transition metal mononuclear complexes, [(Fe L <subscript>2</subscript>)(ClO<subscript>4</subscript>)<subscript>2</subscript>]<subscript>2</subscript>·CH<subscript>3</subscript>CN (1) and (Co L <subscript>2</subscript>)(ClO<subscript>4</subscript>)<subscript>2</subscript>·2CH<subscript>3</subscript>CN (2), have been prepared from a rigid tetradentate bpybox (L = 6,6′-bis(2,5-dihydrooxazol-4-yl)-2,2′-bipyridine) ligand. Single crystal X-ray diffraction analyses together with the help of calculations show that both compounds are octa-coordinate. Direct current magnetic studies reveal their significant magnetic anisotropy. Impressively, field-induced relaxation of magnetism is observed in the two complexes and the apparent anisotropy barriers are 14.1 K for 1 and 21.6 K for 2, respectively. Theoretical calculations reveal that two Fe(II) centers in 1 have small negative D values of −4.897 and −4.825 cm<superscript>−1</superscript> and relatively small E values of 0.646 and 0.830 cm<superscript>−1</superscript>, indicating a uniaxial magnetic anisotropy. In contrast, the D and E values in the Co(II) center of 2 are 46.42 cm<superscript>−1</superscript> and 11.51 cm<superscript>−1</superscript>, featuring a rhombic anisotropy. This work demonstrates that field-induced slow magnetic relaxation in 3d transition metal complexes with high coordination numbers can be manipulated through rigid ligand design. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 51
- Issue :
- 22
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 157297119
- Full Text :
- https://doi.org/10.1039/d2dt00865c