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Light-Induced Spin Crossover in an Fe(II) Low-Spin Complex Enabled by Surface Adsorption
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-03-06 00:00:00 , DOI: 10.1021/acs.jpclett.8b00338
Sebastian Rohlf 1 , Manuel Gruber 1 , Benedikt M. Flöser 2 , Jan Grunwald 2 , Simon Jarausch 1 , Florian Diekmann 1 , Matthias Kalläne 1, 3 , Torben Jasper-Toennies 1 , Axel Buchholz 4 , Winfried Plass 4 , Richard Berndt 1 , Felix Tuczek 2 , Kai Rossnagel 1, 3, 5
Affiliation  

Understanding and controlling the spin-crossover properties of molecular complexes can be of particular interest for potential applications in molecular spintronics. Using near-edge X-ray absorption fine structure spectroscopy, we investigated these properties for a new vacuum-evaporable Fe(II) complex, namely [Fe(pypyr(CF3)2)2(phen)] (pypyr = 2-(2′-pyridyl)pyrrolide, phen = 1,10-phenanthroline). We find that the spin-transition temperature, well above room temperature for the bulk compound, is drastically lowered for molecules arranged in thin films. Furthermore, while within the experimentally accessible temperature range (2 K < T < 410 K) the bulk material shows indication of neither light-induced excited spin-state trapping nor soft X-ray-induced excited spin-state trapping, these effects are observed for molecules within thin films up to temperatures around 100 K. Thus, by arranging the molecules into thin films, a nominal low-spin complex is effectively transformed into a spin-crossover complex.

中文翻译:

Fe(II)低自旋复合物中通过表面吸附实现的光诱导自旋交叉

对于分子自旋电子学中的潜在应用,理解和控制分子复合物的自旋交联性质可能特别感兴趣。使用近边缘X射线吸收精细结构光谱学,我们研究了新的真空可蒸发Fe(II)配合物,即[Fe(pypyr(CF 322(phen)](pypyr = 2-( 2'-吡啶基)吡咯化物,phen = 1,10-菲咯啉)。我们发现,对于大分子化合物而言,自旋转变温度大大高于室温,对于薄膜中排列的分子而言,自旋转变温度大大降低了。此外,在实验上可达到的温度范围内(2 K < T <410 K)。散装材料既没有显示出光诱导的激发自旋态俘获的迹象,也没有显示出软X射线引起的激发自旋态俘获的迹象,对于薄膜中高达100 K左右的温度的分子,都观察到了这些影响。通过将分子排列成薄膜,可以将标称的低自旋复合物有效地转化为自旋交叉复合物。
更新日期:2018-03-06
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