吸附于Ag(100)上的基于Er(III)环辛四烯的单离子磁体的取向驱动型大磁滞回线
Orientation-Driven Large Magnetic Hysteresis of Er(III) Cyclooctatetraenide-Based Single-Ion Magnets Adsorbed on Ag(100)
AI总结：
本研究结合多种谱学技术，探讨了两种基于COT的Er(III)单离子磁体在Ag(100)上的自组装结构差异，揭示了配体环的不同取向导致了两者截然不同的磁各向异性及磁滞回线开口大小。
摘要：
本文报道了两种基于环辛四烯（COT）的单离子磁体（SIM）在亚单层范围内吸附于Ag(100)上的分子自组装和磁性质。我们的研究结合了扫描隧道显微镜、X射线光电子能谱和偏振X射线吸收谱，表明Cp*ErCOT（Cp* = 1,2,3,4,5-五甲基环戊二烯阴离子）SIM自组装为包含直立和平躺构象的交替紧凑平行排，遵循基底的主晶向。相反，由升华[K(18-c-6)][Er(COT)$_2$]$\cdot$ 2THF盐获得的K[Er(COT)$_2$]形成单轴有序畴，其(COT)$^{2-}$环垂直于基底平面。由multiX模拟重现的偏振依赖X射线吸收谱表明，K[Er(COT)$_2$]/Ag(100)的强面内磁各向异性和Cp*ErCOT/Ag(100)的弱面外各向异性可归因于这两种配合物截然不同的表面有序性。与体相相比，表面负载的K[Er(COT)$_2$]表现出类似大的磁滞回线开口，而Cp*ErCOT的开口则相当小。该结果揭示，尽管结构相似，这两种有机金属SMM吸附在金属基底上时具有强烈不同的磁性质，这归因于配体环的不同取向及其与表面产生的相互作用。
英文摘要：
The molecular self-assembly and the magnetic properties of two cyclooctatetraenide (COT) - based single-ion magnets (SIM) adsorbed on Ag(100) in the sub-monolayer range are reported. Our study combines scanning-tunneling microscopy, X-ray photoemission spectroscopy and polarized X-ray absorption spectroscopy to show that Cp*ErCOT (Cp* = 1,2,3,4,5-pentamethylcyclopentadienide anion) SIMs self-assemble as alternating compact parallel rows including standing-up and lying-down conformations, following the main crystallographic directions of the substrate. Conversely, K[Er(COT)$_2$], obtained from subliming the [K(18-c-6)][Er(COT)$_2$]$\cdot$ 2THF salt, forms uniaxially ordered domains with the (COT)$^{2-}$ rings perpendicular to the substrate plane. The polarization-dependent X-ray absorption spectra reproduced by the multiX simulations suggest that the strong in-plane magnetic anisotropy of K[Er(COT)$_2$]/Ag(100) and the weak out-of-plane anisotropy of Cp*ErCOT/Ag(100) can be attributed to the strikingly different surface ordering of these two complexes. Compared to the bulk phase, surface-supported K[Er(COT)$_2$] exhibits a similarly large hysteresis opening, while the Cp*ErCOT shows a rather small opening. This result reveals that despite structural similarities, the two organometallic SMMs have strongly different magnetic properties when adsorbed on the metal substrate, attributed to the different orientations and the resulting interactions of the ligand rings with the surface.
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