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High-coordinate CoII and FeII compounds constructed from an asymmetric tetradentate ligand show slow magnetic relaxation behavior.
- Source :
-
Dalton Transactions: An International Journal of Inorganic Chemistry . 7/21/2018, Vol. 47 Issue 27, p8940-8948. 9p. - Publication Year :
- 2018
-
Abstract
- Using an asymmetric tetradentate ligand N-((6-(1H-pyrazol-1-yl)pyridin-2-yl)methylene)benzohydrazide (pypzbeyz), two high-coordinate 3d transition metal compounds [CoII(pypzbeyz)(NO3)2] (1) and [FeII(pypzbeyz)2](BF4)2(CH3CN) (2) have been synthesized and characterized by structural and magnetic measurements. X-ray crystallographic analyses revealed that compound 1 is seven-coordinate with a distorted pentagonal bipyramidal geometry (pseudo-D5h) and compound 2 is eight-coordinate with a triangular dodecahedral geometry (pseudo-D2d). Direct current (dc) magnetic susceptibilities revealed that compound 1 shows easy-plane magnetic anisotropy (D = +29.9 cm−1, E = 0.31 cm−1) and 2 shows easy-axis magnetic anisotropy (D = −6.6 cm−1, E = 0.02 cm−1). Alternating current (ac) magnetic measurements indicate that both compounds exhibit field-induced slow magnetic relaxation behavior. Furthermore, ab initio calculations also demonstrate that compound 1 presents a strong easy-plane magnetic anisotropy and 2 presents an easy-axis magnetic anisotropy, which are further identified by the calculated orientations of the local magnetic axes. These results demonstrate an effective way to achieve the targeted synthesis of high-coordinate 3d SIMs. [ABSTRACT FROM AUTHOR]
- Subjects :
- *IRON compounds
*LIGANDS (Chemistry)
*MAGNETIC relaxation
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 47
- Issue :
- 27
- Database :
- Academic Search Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 130624300
- Full Text :
- https://doi.org/10.1039/c8dt01829d