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首页> 外文期刊>Physica, B. Condensed Matter >Multi-phase spin crossover in Fe(ptz)(6)(BF4)(2)
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Multi-phase spin crossover in Fe(ptz)(6)(BF4)(2)

机译：Fe（ptz）（6）（BF4）（2）中的多相自旋交叉

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摘要

Transition metal complexes present solid state phase transitions associated with a change of the spin state, low-spin at low temperature to high-spin at high temperature, often with a significant change of metal-ligand bond lengths. Elastic interactions between small low-spin molecules and large high-spin ones play an important role in the phase transition. Since the discovery of spin crossover phenomenon, the complex [Fe (ptz)(6)](BF4)(2) has successfully attracted the interest of scientists because of its complete spin conversion and of its sensitivity to light. This very rich phase multi-stability also offers a unique possibility to investigate carefully the spin crossover phenomena in diverse fundamental cases (coupled with a ferroelastic transition, after quenching, after irradiation,...), and in an unusual case where the metal ion lies on a high-symmetry site. On the basis of results obtained by neutron scattering under high pressure, we present here the (pressure-temperature) phase diagram of the complex [Fe (ptz)(6)](BF4)(2), which appears as seriously more complex than expected from the earlier literature, with in particular at least two new phases, one corresponding to complexes in a high-spin state but stacked in low symmetry, the other arising from an unexpected reconstructive phase transition.
机译：过渡金属配合物呈现出与自旋态变化相关的固态相变，自旋态在低温下为低自旋，在高温下为高自旋，通常伴随着金属-配体键长的显着变化。小自旋小分子与大自旋大分子之间的弹性相互作用在相变中起重要作用。自发现自旋交叉现象以来，[Fe（ptz）（6）]（BF4）（2）络合物因其完全的自旋转换和对光的敏感性而成功地引起了科学家的兴趣。这种非常丰富的相多稳定性还提供了一种独特的可能性，可以在各种基本情况下（结合淬火后，在辐照后……）发生铁磁转变，并仔细研究自旋交叉现象，并且在不常见的情况下，金属离子位于高对称站点上。根据高压下中子散射获得的结果，在这里我们给出了[Fe（ptz）（6）]（BF4）（2）配合物的（压力-温度）相图。可以从早期文献中预期到，尤其是至少有两个新的相，一个对应于高自旋状态的复合物，但以低对称性堆叠，另一相则来自意外的重建相变。

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