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![]() PALAMARCIUC, Tatiana, SHEPHERD, Helena J., ROSA, Patrick, GUIONNEAU, Philippe, MOLNAR, Gabor, LETARD, Jean-Francois, BOUSSEKSOU, Azzedine. Investigation of a spin crossover mechanism in an iron(II) compound. In: A.I.Cuza University Days: Faculty of Chemistry Conference, 27-29 octombrie 2016, Iași, România. Iași, România: Editura Universitatii Alexandru Ioan Cuza, Iasi, 2016, p. 53. |
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A.I.Cuza University Days 2016 | ||||||
Conferința "A.I.Cuza University Days" Iași, România, Romania, 27-29 octombrie 2016 | ||||||
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The design of iron(II) spin crossover (SCO) complexes which exhibit wide thermal References |
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Cerif XML Export
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In this aim, it is crucial to understand the main factors<br />which control the spin crossover phenomenon.<br />We were interested in investigating the cooperative effects in the [Fe(dpp)2(NCS)2]py (dpp<br />= dipyrido[3,2-a:2,3,-c]phenazine and py = pyridine) compound (Figure 1a) described in 1998 [1]<br />which presents a fairly abrupt spin transition at 123 K in the cooling mode and 163 K in the heating<br />mode, with a resulting hysteresis of 40 K (Figure 1b).<br />In this study we used high-pressure single-crystal X-ray diffraction and Raman<br />spectroscopy to study the spin crossover (SCO) between high spin (HS) and low spin (LS) states in<br />the mentioned above compound. A single geometrical mechanism is responsible not only for the<br />strongest negative linear compression (NLC) behaviour yet observed in a molecular material,<br />combined with negative thermal expansion (NTE) and extreme positive linear compressibility, but<br />also for the high cooperativity of the SCO in [Fe(dpp)2(NCS)2]·py. The scissor-like motion of<br />individual molecules is propagated through the lattice via the physical intercalation of ligands and<br />is also responsible for suppressing the expected HS→LS SCO under pressure [2].</p><p>References<br />1. Z. J. Zhong, J.-Q. Tao, Z. Yu, C.-Y. Dun, Y.-J. Liu, X.-Z. You, J. Chem. Soc. Dalton Trans.,<br />327 – 328, 1998.<br />2. H. J. Shepherd, T. Palamarciuc, P. Rosa, P. Guionneau, G. Molnar, J.-F. Letard, A. Bousseksou,<br />Angew. 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