Bulk spin-crossover in the complex [FeL(NCS)2] of a tris(pyridyl)ethane-derived N4-ligand--a temperature-dependent crystallographic study.

Bulk spin-crossover in the complex [FeL(NCS)2] of a tris(pyridyl)ethane-derived N4-ligand--a temperature-dependent crystallographic study.
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三(吡啶基)乙烷衍生的 N4-配体的配合物 [FeL(NCS)2] 中的整体自旋交叉——温度依赖性晶体学研究

DOI:
10.1039/c3dt53070a
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发表时间:
2014
影响因子:
4
通讯作者:
A. Grohmann
A. Grohmann
中科院分区:
化学2区
文献类型:
--
作者:
D. Wiedemann;A. Grohmann

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我们最近证明了真空沉积配合物[FeIIL(NCS)2] (L: 1-{6-[1,1-二(吡啶-2-基)乙基]-吡啶-2-基}- n, n-二甲基甲烷胺)在与石墨表面直接接触时能够发生热诱导自旋交叉(SCO)。SCO明显不同于体相(粉末)中的转变行为。在本工作中,通过与丙酮溶液中的自旋跃迁(T1/2 = 234[3] K, ΔT80 = 58[4] K)进行比较,证实了粉末中几乎没有分子间相互作用的假设,这是由温度依赖的紫外/可见光谱监测的。这种配合物由氯碳以许多伪多晶的形式结晶而成。其中,充分稳定的溶剂化物[FeIIL(NCS)2]·CHCl3用变温单晶x射线衍射法进行了研究。它的SCO行为(T1/2 = 240[3] K, ΔT80 = 35[4] K)与分子结构的特征相关,这些特征通过热膨胀张量的分析得到了明确的识别。在综合比较了不同聚集状态下的自旋转变性质(也与新合成的高自旋铁(II)和铁(III)配合物[FeIICl2L]和[FeIIICl2L]PF6有关)之后,提出了一种在石墨表面的吸附模式,与所有先前的发现一致。
We have recently shown that the vacuum-deposited complex [FeIIL(NCS)2] (L: 1-{6-[1,1-di(pyridin-2-yl)ethyl]-pyridin-2-yl}-N,N-dimethylmethanamine) is capable of a thermally induced spin crossover (SCO) in direct contact with a graphite surface. The SCO significantly differs from the transition behaviour in the bulk phase (powder). In the present work, the assumption of virtually no intermolecular interaction in the powder is confirmed by comparison with the spin transition in acetone solution (T1/2 = 234[3] K, ΔT80 = 58[4] K), as monitored by temperature-dependent UV/Vis spectroscopy. The complex crystallises from chlorocarbons in the form of a number of pseudopolymorphs. Amongst these, the sufficiently stable solvate [FeIIL(NCS)2]·CHCl3 is investigated by variable-temperature single-crystal X-ray diffractometry. Its SCO behaviour (T1/2 = 240[3] K, ΔT80 = 35[4] K) correlates with features of molecular structure that are unambiguously identified by analysis of the tensor of thermal expansion. Following comprehensive comparison of spin-transition properties in different states of aggregation (also in relation to the newly synthesised high-spin iron(II) and iron(III) complexes [FeIICl2L] and [FeIIICl2L]PF6), a mode of adsorption on graphite surfaces is proposed, that complies with all previous findings.
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