Walter Marcel, Hadjadj Sebastien Elie, Trommer Clara, Torres Jorge, Gördes Jendrik, Swerev David, Shinwari Tauqir, Lotze Christian, Luo Chen, Radu Florin, Tuczek Felix, Thakur Sangeeta, Kuch Wolfgang
Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany.
Institut für Anorganische Chemie, Christian-Albrechts Universität zu Kiel, 24098, Kiel, Germany.
Chemphyschem. 2025 Aug 23;26(16):e202401081. doi: 10.1002/cphc.202401081. Epub 2025 May 7.
The spin-crossover (SCO) properties of the dinuclear complex 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.
通过X射线吸收光谱法，研究了双核配合物以超高真空液体喷射沉积技术沉积在高度取向热解石墨（HOPG）上形成的（亚）单层和薄膜的自旋交叉（SCO）性质。薄膜和滴铸样品的SCO性质比较表明，由于底物-分子相互作用，薄膜的自旋转换概率受到限制。与滴铸样品相比，在80 K温度下，0.7和1.8单层（ML）观察到的低自旋（LS）态分子的最大百分比约为43%，而在滴铸样品中，约66%的配合物处于LS态。滴铸样品与块状粉末样品具有相似的转换性质，这证实了SCO性质不受沉积所需溶剂存在的影响。尽管与SOXIESST获得的高自旋（HS）分数相比，HOPG上滴铸样品和薄膜样品的光致HS分数更高，但所有样品中均出现了软X射线诱导的激发自旋态捕获（SOXIESST）效应，这证实了该配合物对光的敏感性。
