2
The final wR(F ) values were 0.1291 (I 4 2s(I)). The final R
were 0.1068 (all data). The final wR(F ) values were 0.1407 (all data).
1
values
2
2
2 4 2
Crystal data for [FeL ]: C24H18FeN O , M = 450.27, orthorhombic,
3
a = 9.9499(6) A, b = 11.0634(5) A, c = 19.3835(9) A, V = 2133.73(19) A ,
T = 100(2)K, space group Pbca, Z = 4, 11 020 reflections measured,
˚
˚
˚
˚
2
026 independent reflections (Rint = 0.1488). The final R
1
values were
2
0.0830 (I 4 2s(I)). The final wR(F ) values were 0.1831 (I 4 2s(I)). The
2
1
final R values were 0.1027 (all data). The final wR(F ) values were 0.1936
(all data).
1
2
S. Venkataramani, U. Jana, M. Dommaschk, F. D. Sonnichsen,
¨
F. Tuczek and R. Herges, Science, 2011, 331, 445–448.
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3
4
G. Karotsis, M. Evangelisti, S. J. Dalgarno and E. K. Brechin,
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2
Fig. 5 ZFCW and FCC M vs. T curves for [FeL
000 Oe.
2
] measured at
1
2
002, 415, 150–152.
5
6
7
8
9
O. Kahn, Molecular Magnetism, WILEY-VCH, 1993.
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1
0 E. Coronado, J. R. Galan-Mascaros, C. J. Gomez-Garcia and
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1
1
1 E. Coronado and P. Day, Chem. Rev., 2004, 104, 5419–5448.
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2
002, 124, 10002–10003.
3 A. Alberola, E. Coronado, J. R. Gala
Saiz and C. J. Gomez-Garcıa, J. Am. Chem. Soc., 2003, 125,
0774–10775.
1
n-Mascaros, C. Gimenez-
´ ´ ´
´
´
1
1
1
4 Y. Pei and O. Kahn, Mol. Cryst. Liq. Cryst., 1989, 176.
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2
2
Fig. 6 M vs. H curve at 1.8 K for complex [FeL ] showing ferro-
magnetic hysteresis.
¨ ˙
1
1
6 H. O. Demir, I. Kaya and M. Sa c¸ ak, Polym. Bull., 2008, 60, 37–48.
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the compound of 467 Oe is smaller than for some room
temperature permanent magnets such as SmCo (44 kOe)
and Nd Fe B (19 kOe), such hard magnetism even at low
5
1
8 F. Robert, A. D. Naik, B. Tinant, R. Robiette and Y. Garcia,
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¨
4422–4429.
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2
14
temperatures is unusual in molecular systems where a few
2
examples of very large coercivities have been observed.
1
4,25
1
In conclusion, while the more flexible L system gives a
2
diamond-like 3D network exhibiting gradual spin-crossover,
2
the geometry of the now readily available L favours a 2D
2
framework and orthogonal arrangement of adjacent metal
5
22 G. S. Matouzenko, M. Perrin, B. Le Guennic, C. Genre,
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centres, leading to
a rare molecular example of a hard
2
007, 934–942.
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2
1
ligand, L and L can be used with a range of metals. The
2
M. Ruben, Chem. Commun., 2007, 2636–2638.
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2
behaviour and versatility of L in particular gives us the
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affect intermetallic coupling and inter-layer interactions to
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to pursue higher TC systems.
2
5 D. K. Rittenberg, K. Sugiura, Y. Sakata, S. Mikami, A. J. Epstein
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2
2
7 S. Ohkubo, Bull. Chem. Soc. Jpn., 1992, 65, 1603–1707.
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Notes and references
1
1
]ꢀ1 (H
4
1
2
z Crystal data for [FeL
2
2
O)ꢀ (MeOH): C24
.
50
H
22
.
50FeN
4
O
3
.
75
˚
,
29 C. S. Hong, J. H. Yoon and Y. S. You, Inorg. Chem. Commun.,
2005, 8, 310–313.
30 N. Matsumoto, T. Nozaki, H. Ushio, K.-i. Motoda, M. Ohba,
G. Mago and H. Okawa, J. Chem. Soc., Dalton Trans., 1993,
2157–2162.
˚
M = 488.82, tetragonal, a = 19.3307(2) A, b = 19.3307(2) A,
3
˚
˚
%
c = 27.7612(8) A, V = 10373.7(3) A , T = 100(2)K, space group I4
d, Z = 16, 23 628 reflections measured, 3577 independent reflections
int = 0.0795). The final R values were 0.0553 (I 4 2s(I)).
2
(
R
1
1
2648 Chem. Commun., 2011, 47, 12646–12648
This journal is c The Royal Society of Chemistry 2011