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<creators>
<creator>
<creatorName>Palamarciuc, T.A.</creatorName>
<affiliation>Universitatea de Stat din Moldova, Moldova, Republica</affiliation>
</creator>
<creator>
<creatorName>Shepherd, H.</creatorName>
<affiliation>Laboratoire de Chimie de Coordination du CNRS, Franţa</affiliation>
</creator>
<creator>
<creatorName>Rosa, P.</creatorName>
<affiliation>Universitatea Bordeaux, Franţa</affiliation>
</creator>
<creator>
<creatorName>Guionneau, P.</creatorName>
<affiliation>Universitatea Bordeaux, Franţa</affiliation>
</creator>
<creator>
<creatorName>Molnar, G.</creatorName>
<affiliation>Laboratoire de Chimie de Coordination du CNRS, Franţa</affiliation>
</creator>
<creator>
<creatorName>Letard, J.</creatorName>
<affiliation>Universitatea Bordeaux, Franţa</affiliation>
</creator>
<creator>
<creatorName>Bousseksou, A.</creatorName>
<affiliation>Laboratoire de Chimie de Coordination du CNRS, Franţa</affiliation>
</creator>
</creators>
<titles>
<title xml:lang='en'>Investigation of a spin crossover mechanism in an iron(II) compound</title>
</titles>
<publisher>Instrumentul Bibliometric National</publisher>
<publicationYear>2016</publicationYear>
<relatedIdentifier relatedIdentifierType='ISBN' relationType='IsPartOf'></relatedIdentifier>
<dates>
<date dateType='Issued'>2016</date>
</dates>
<resourceType resourceTypeGeneral='Text'>Conference Paper</resourceType>
<descriptions>
<description xml:lang='en' descriptionType='Abstract'><p>The design of iron(II) spin crossover (SCO) complexes which exhibit wide thermal<br />hysteresis have attracted much attention lately, since their bistable nature could allow their use as<br />molecular switches in new electronic devices. 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]&middot;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&rarr;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 &ndash; 328, 1998.<br />2. H. J. Shepherd, T. Palamarciuc, P. Rosa, P. Guionneau, G. Molnar, J.-F. Letard, A. Bousseksou,<br />Angew. Chem. 124, 3976-3980, 2012.</p></description>
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<format>application/pdf</format>
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