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Spin-Crossover Complexes in Direct Contact with Surfaces

Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 19, 24098 Kiel, Germany
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Magnetochemistry 2020, 6(3), 35; https://doi.org/10.3390/magnetochemistry6030035
Received: 5 August 2020 / Revised: 21 August 2020 / Accepted: 24 August 2020 / Published: 27 August 2020
(This article belongs to the Special Issue Emerging Applications and Developments in Spin Crossover Systems)
The transfer of the inherent bistability of spin crossover compounds to surfaces has attracted considerable interest in recent years. The deposition of the complexes on surfaces allows investigating them individually and to further understand the microscopic mechanisms at play. Moreover, it offers the prospect of engineering switchable functional surfaces. We review recent progress in the field with a particular focus on the challenges and limits associated with the dominant experimental techniques used, namely near-edge X-ray absorption fine structure (NEXAFS) spectroscopy and scanning tunneling microscopy (STM). One of the main difficulties in NEXAFS-based experiments is to ascertain that the complexes are in direct contact with the surfaces. We show that molecular coverage determination based on the amplitude of the edge-jump of interest is challenging because the latter quantity depends on the substrate. Furthermore, NEXAFS averages the signals of a large number of molecules, which may be in different states. In particular, we highlight that the signal of fragmented molecules is difficult to distinguish from that of intact and functional ones. In contrast, STM allows investigating individual complexes, but the identification of the spin states is at best done indirectly. As quite some of the limits of the techniques are becoming apparent as the field is gaining maturity, their detailed descriptions will be useful for future investigations and for taking a fresh look at earlier reports. View Full-Text
Keywords: spin crossover; single molecule; surfaces; scanning tunneling spectroscopy; near-edge X-ray absorption fine structure spin crossover; single molecule; surfaces; scanning tunneling spectroscopy; near-edge X-ray absorption fine structure
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MDPI and ACS Style

Gruber, M.; Berndt, R. Spin-Crossover Complexes in Direct Contact with Surfaces. Magnetochemistry 2020, 6, 35. https://doi.org/10.3390/magnetochemistry6030035

AMA Style

Gruber M, Berndt R. Spin-Crossover Complexes in Direct Contact with Surfaces. Magnetochemistry. 2020; 6(3):35. https://doi.org/10.3390/magnetochemistry6030035

Chicago/Turabian Style

Gruber, Manuel; Berndt, Richard. 2020. "Spin-Crossover Complexes in Direct Contact with Surfaces" Magnetochemistry 6, no. 3: 35. https://doi.org/10.3390/magnetochemistry6030035

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