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Molecular Structures and Magnetism of Mn 12 Nanomagnets Containing the 3‐Thiophenecarboxylate Ligand
The new Mn 12 single‐molecule magnets containing thiophenyl ligands, [Mn 12 O 12 (O 2 CC 4 H 3 S) 16 (HO 2 CC 4 H 3 S)(H 2 O) 2 ] · 5CH 2 Cl 2 ( 1 ) and [Mn 12 O 12 (O 2 CC 4 H 3 S) 16 (H 2 O) 4 ] · 6CH 2 Cl 2 · 2H 2 O ( 2 ), have been synthesized by ligand‐substitution reactions of 3‐thiophenecarbo...
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| Published in: | European journal of inorganic chemistry 2006-02, Vol.2006 (4), p.711-717 |
|---|---|
| Main Authors: | , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | The new Mn
12
single‐molecule magnets containing thiophenyl ligands, [Mn
12
O
12
(O
2
CC
4
H
3
S)
16
(HO
2
CC
4
H
3
S)(H
2
O)
2
]
·
5CH
2
Cl
2
(
1
) and [Mn
12
O
12
(O
2
CC
4
H
3
S)
16
(H
2
O)
4
]
·
6CH
2
Cl
2
·
2H
2
O (
2
), have been synthesized by ligand‐substitution reactions of 3‐thiophenecarboxylic acid and [Mn
12
O
12
(O
2
CCH
3
)
16
(H
2
O)
4
] and investigated by magnetic measurements with a SQUID magnetometer. The X‐ray analysis of
1
shows five‐coordination geometry around the Mn
III
ion due to the unusual coordination of 3‐thiophenecarboxylic acid to the Mn
III
ion. Compound
1
displays two different rates of magnetization relaxation, which are faster than that of compound
2
because of structural distortion in the Mn
12
complex of
1
. Magnetic susceptibility measurements on
1
and
2
give the following parameters:
U
eff
(the faster relaxation form of
1
) = 51.81 K, 1/
τ
0
= 1.90
·
10
8
s
–1
;
U
eff
(the slower relaxation form of
1
) = 66.44 K, 1/
τ
0
= 1.50
·
10
8
s
–1
;
U
eff
(
2
) = 67.09 K, 1/
τ
0
= 1.32
·
10
8
s
–1
. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) |
|---|---|
| ISSN: | 1434-1948 1099-0682 |
| DOI: | 10.1002/ejic.200500727 |