Mononuclear and trinuclear Dy SMMs with Schiff-base ligands modified by nitro-groups: first triangular complex with a N-N pathway
Using two Schiff-base ligands containing an electron-withdrawing group (NO 2 ), we obtained two mononuclear and two trinuclear complexes with the general formula [Dy(hni)(NO 3 )(DMF) 2 ]·DMF ( 1 ·DMF), [Dy(hni) 2 (H 2 O) 2 ]·NO 3 ·EtOH ( 2 ·NO 3 ·EtOH), [Dy 3 (hnc) 3 (DMF) 6 ] ( 3 ) and [Gd 3 (hnc)...
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Published in | Dalton transactions : an international journal of inorganic chemistry Vol. 48; no. 46; pp. 17331 - 17339 |
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Main Authors | , , , |
Format | Journal Article |
Published |
26.11.2019
|
Online Access | Get full text |
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Summary: | Using two Schiff-base ligands containing an electron-withdrawing group (NO
2
), we obtained two mononuclear and two trinuclear complexes with the general formula [Dy(hni)(NO
3
)(DMF)
2
]·DMF (
1
·DMF), [Dy(hni)
2
(H
2
O)
2
]·NO
3
·EtOH (
2
·NO
3
·EtOH), [Dy
3
(hnc)
3
(DMF)
6
] (
3
) and [Gd
3
(hnc)
3
(DMF)
6
] (
4
) (
H-hni
: 2-(hydroxyl-3-methoxy-5-nitrophenyl)methylene(isonictino)hydrazine and
H
3
-hnc
: 1,5-bis(2-hydroxy-3-methoxy-5-nitrobenzylidene)carbonohydrazide). Four complexes were confirmed by infrared spectroscopy and single-crystal X-ray diffraction. The crystal structure of complex
3
reveals that the modified Schiff-base ligand provides two different tridentate coordination pockets (ONN and ONO) to encapsulate Dy
III
with a unique N-N pathway. The magnetic properties of all four complexes have been investigated using dc and ac susceptibility measurements. The frequency-dependent ac susceptibility is indicative of single-molecule magnetic behavior without and/or with an optimum dc field with a relaxation barrier
U
eff
= 34 K (400 Oe), 19 K (0 Oe) and 80 K (0 Oe) for complexes
1
,
2
and
3
, respectively.
Three Dy
III
SMMs were obtained with Schiff-base ligands containing nitro-groups. The triangular complex supported by the
cis
-
trans
form of the hnc
3−
ligand displayed the first air-stable triangular complex with a N-N pathway. |
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Bibliography: | Electronic supplementary information (ESI) available. CCDC 1897353 For ESI and crystallographic data in CIF or other electronic format see DOI 1897393 1897352 and , 1948085 10.1039/C9DT02646K |
ISSN: | 1477-9226 1477-9234 |
DOI: | 10.1039/c9dt02646k |