Spin-Crossover in a Dinuclear Iron(II) Complex on Highly Oriented Pyrolytic Graphite: An X-Ray Absorption Spectroscopy Study.

IF 2.3 3区化学 Q3 CHEMISTRY, PHYSICAL

Chemphyschem Pub Date : 2025-04-07 DOI:10.1002/cphc.202401081

Marcel Walter, Sebastien Elie Hadjadj, Clara Trommer, Jorge Torres, Jendrik Gördes, David Swerev, Tauqir Shinwari, Christian Lotze, Chen Luo, Florin Radu, Felix Tuczek, Sangeeta Thakur, Wolfgang Kuch

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Abstract

The spin-crossover (SCO) properties of the dinuclear complex $[{Fe {(H_{2} B {(pz)}_{2})}_{2}}_{2} μ - ({ac(bipy)}_{2})]$ are studied as (sub)-monolayer and thin film deposited by an ultrahigh vacuum liquid-jet deposition technique on highly oriented pyrolytic graphite (HOPG) by X-ray absorption spectroscopy. A comparison of the SCO properties of thin films and a dropcast sample indicates that the spin-switching probability of the thin films is limited due to substrate-molecule interactions. The maximum percentage of molecules in the low-spin (LS) state observed for 0.7 and 1.8 monolayers (ML) is ≈43% at a temperature of 80 K in comparison to the dropcast sample where ≈66% of the complex is in the LS state. The similar switching properties of the dropcast sample as of a bulk powder sample confirm that the SCO properties are not affected by the presence of solvent necessary for deposition. The soft-X-ray-induced excited spin-state trapping (SOXIESST) effect is pronounced in all samples, although the light-induced high-spin (HS) fraction of the dropcast and the thin-film samples on HOPG is higher as compared to the HS fraction attained by SOXIESST, which confirms the sensitivity of the complex to light.

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HOPG上双核铁（II）配合物的自旋交叉：x射线吸收光谱研究。

通过 X 射线吸收光谱法研究了双核复合物[{Fe(H2B(pz)2)2}2μ-(ac(bipy)2)]在高取向热解石墨（HOPG）上通过超高真空喷液沉积技术沉积成（亚）单层和薄膜的自旋交叉（SCO）特性。对薄膜和滴铸样品的 SCO 特性进行比较后发现，由于基底与分子之间的相互作用，薄膜的自旋切换概率受到了限制。在温度为 80K 时，0.7 和 1.8 单层（ML）中处于低自旋（LS）状态的分子所占的最大比例约为 43%，而液滴样品中处于 LS 状态的复合物所占的比例≈ 66%。滴铸样品的开关特性与块状粉末样品相似，这证实了 SCO 特性不受沉积所需的溶剂存在的影响。软 X 射线诱导激发的自旋态捕获（SOXIESST）效应在所有样品中都很明显，尽管与 SOXIESST 所达到的 HS 部分相比，HOPG 上的液滴样品和薄膜样品的光诱导高自旋（HS）部分更高，这证实了复合物对光的敏感性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemphyschem 化学-物理：原子、分子和化学物理

CiteScore

4.60

自引率

3.40%

发文量

425

审稿时长

1.1 months

期刊介绍： ChemPhysChem is one of the leading chemistry/physics interdisciplinary journals (ISI Impact Factor 2018: 3.077) for physical chemistry and chemical physics. It is published on behalf of Chemistry Europe, an association of 16 European chemical societies. ChemPhysChem is an international source for important primary and critical secondary information across the whole field of physical chemistry and chemical physics. It integrates this wide and flourishing field ranging from Solid State and Soft-Matter Research, Electro- and Photochemistry, Femtochemistry and Nanotechnology, Complex Systems, Single-Molecule Research, Clusters and Colloids, Catalysis and Surface Science, Biophysics and Physical Biochemistry, Atmospheric and Environmental Chemistry, and many more topics. ChemPhysChem is peer-reviewed.