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High-coordinate CoII and FeII compounds constructed from an asymmetric tetradentate ligand show slow magnetic relaxation behaviorElectronic supplementary information (ESI) available: 1H, 13C, HSQC and HMBC NMR of the ligand, detailed structural parameters, the continuous shape measures, other magnetic plots and fitting parameters of the Cole-Cole plots for 1 and 2. CCDC 1831200-1831202. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c8dt01829d
Using an asymmetric tetradentate ligand N -((6-(1 H -pyrazol-1-yl)pyridin-2-yl)methylene)benzohydrazide ( pypzbeyz ), two high-coordinate 3d transition metal compounds [Co II ( pypzbeyz )(NO 3 ) 2 ] ( 1 ) and [Fe II ( pypzbeyz ) 2 ](BF 4 ) 2 (CH 3 CN) ( 2 ) have been synthesized and characterized by...
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| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | Using an asymmetric tetradentate ligand
N
-((6-(1
H
-pyrazol-1-yl)pyridin-2-yl)methylene)benzohydrazide (
pypzbeyz
), two high-coordinate 3d transition metal compounds [Co
II
(
pypzbeyz
)(NO
3
)
2
] (
1
) and [Fe
II
(
pypzbeyz
)
2
](BF
4
)
2
(CH
3
CN) (
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-
D
5h
) and compound
2
is eight-coordinate with a triangular dodecahedral geometry (pseudo-
D
2d
). 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.
A seven-coordinate Co
II
compound and an eight-coordinate Fe
II
compound based on an asymmetric tetradentate ligand have been reported, and both of them exhibited slow magnetic relaxation behaviour. |
|---|---|
| ISSN: | 1477-9226 1477-9234 |
| DOI: | 10.1039/c8dt01829d |