Anion-dependent dysprosium() cluster single-molecule magnets
A new Schiff base ligand, which is formed by the condensation reaction of 5-fluorosalicylaldehyde and pyrimidine-4-carbonyl hydrazide {H 2 L Schiff = ( E )- N ′-(5-fluoro-2-hydroxybenzylidene)pyrimidine-4-carbohydrazide}, was made to react with different dysprosium( iii ) salts in an alkaline soluti...
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| Published in | New journal of chemistry Vol. 47; no. 4; pp. 18849 - 18855 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Cambridge
Royal Society of Chemistry
16.10.2023
|
| Subjects | |
| Online Access | Get full text |
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| Summary: | A new Schiff base ligand, which is formed by the condensation reaction of 5-fluorosalicylaldehyde and pyrimidine-4-carbonyl hydrazide {H
2
L
Schiff
= (
E
)-
N
′-(5-fluoro-2-hydroxybenzylidene)pyrimidine-4-carbohydrazide}, was made to react with different dysprosium(
iii
) salts in an alkaline solution to assemble Dy
4
and Dy
6
cluster complexes, [Dy
4
(OH)
2
(L
Schiff
)
4
(H
2
O)
2
(NO
3
)
2
]·4MeCN·MeOH (
1
) and [Dy
6
(CO
3
)
2
(L
Schiff
)
6
(H
2
O)
3
(MeOH)Cl
2
]·5MeOH (
2
), depending on whether the anion used is nitrate or chloride. Complex
1
corresponding to the nitrate anion is a butterfly-like Dy
4
cluster complex with four different Dy(
iii
) coordination configurations of [O
6
N
2
], [O
8
N], [O
7
N
2
] and [O
6
N
3
]; when the anion is replaced by the chloride anion, carbon dioxide can be automatically captured from the air and converted into a carbonate bridging ligand, and the final product obtained is complex
2
, which is a triangular prism-type Dy
6
cluster complex with double μ
3
-carbonate bridging ligands. Both
1
and
2
show good zero-field SMM properties, with
U
eff
/
k
values of 116.5 K for
1
and 150.9 K for
2
.
The same Schiff base ligand was used to assemble different zero-field Dy(
iii
) cluster single-molecule magnets with a nuclei number of 4 or 6, depending on the anions. |
|---|---|
| Bibliography: | plot at 1500 Oe and hysteresis loops at 1.9 K. CCDC τ 2283184 2283183 iii at 1500 Oe; ln ) M versus T at 1500 Oe; plots of versus ion geometry analysis by SHAPE 2.1 software For ESI and crystallographic data in CIF or other electronic format see DOI χ′′ versus T plots; linear combination of two modified Debye model fitting parameters; plots of T χ′′ versus v and Electronic supplementary information (ESI) available: Crystal data and structural refinement parameters; IR spectra; Dy https://doi.org/10.1039/d3nj03610c 1/ ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 |
| ISSN: | 1144-0546 1369-9261 |
| DOI: | 10.1039/d3nj03610c |