Crystal Growth & Design
Communication
intra- and intermolecular interactions, which can play an
important role regarding with cooperativity.
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28
(
́
10) Letard, J.-F.; Guionneau, P.; Goux-Capes, L. Spin Crossover in
For 2 with HS state, Σ = 78 and Θ = 273; these values show
greater structural distortions than a perfectly octahedral
complex. Therefore, the HS structure of 2 differs more strongly
from that expected for its LS form, which is why 2 does not
undergo SCO upon cooling and displays a stable HS state.
From the crystal engineering aspect, there are some subtle
differences in the H-bonds of the complexes. In LS 1 and HS 1
there exists the H-bond of N4A−H···S1. However, in complex
Transition Metal Compounds III; Springer: Berlin, Heidelberg, 2004;
Vol. 235, p 221.
(
11) Bousseksou, A.; Molnar
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, G.; Salmon, L.; Nicolazzi, W. Chem.
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(
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2004, 4353.
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2062.
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Monatsh. Chem. 2009, 140, 695.
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oz, M. C. Dalton Trans. 2005,
2
, there is no H-bond (Figure S4). That may be the origin of
̌
(
I.; Madhu, N. T.; Boca, R.; Pavlik, J.; Ruben, M.
̌ ̌
the different coordination distortion parameters.
The differential scanning calorimetry (DSC) data (Figure 2
inset) show one exo- and one endothermic broad peak around
̌
̈
́ ̌
er, B.; Rajnak, C.; Salitros, I.; Fuhr, O.; Klar, D.; Schmitz-
(
16) Schaf
Antoniak, C.; Weschke, E.; Wende, H.; Ruben, M. Chem. Commun.
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3
15 K in the heating and cooling mode, respectively, which
2
(
agrees well with the spin transition. The thermogravimetric
analysis (TGA) indicates that complex 1 is thermally stable up
to about 400 °C (Figure S5).
(
̈
In summary, two new mononuclear isomorphous Fe(II)
complexes were synthesized and magnetically characterized.
Although complexes 1 and 2 crystallize in the same space group
with similar π−π stacking interaction, due to the different
structural distortion in the coordination geometries, complex 1
exhibits thermally induced spin transition near room temper-
ature (T1/2 = 315 K) without hysteresis, while 2 shows a stable
HS state. Further detailed studies are in progress.
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Chem. Commun. 2014, 50, 1003.
̃
́
oz, M. C.; Andrez, E.; Granier, T.; Gallois, B.
(
(
́
́
5
(
ASSOCIATED CONTENT
Supporting Information
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S
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3
(
X-ray crystallographic data in CIF format, synthetic details,
materials and method, structural figures, PXRD, DSC and TGA
plots, magnetic plots, crystallographic table, and tables
́
ard, J.-F.; Chasseau, D. Acta
(
(
AUTHOR INFORMATION
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*
*
Notes
The authors declare no competing financial interest.
ACKNOWLEDGMENTS
■
This work was supported by the Natural Science Foundation of
China (21290171, 21321001), the National Basic Research
Program (2013CB933401), and the China Postdoctoral
Science Foundation (2013M530469)
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