Iron(II) Spin‐Crossover Complexes in Ultrathin Films: Electronic Structure and Spin‐State Switching by Visible and Vacuum‐UV Light |
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| Authors: | E. Ludwig H. Naggert Dr. M. Kalläne S. Rohlf E. Kröger Dr. A. Bannwarth A. Quer Dr. K. Rossnagel Prof. Dr. L. Kipp Prof. Dr. F. Tuczek |
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| Affiliation: | 1. Institut für Experimentelle und Angewandte Physik, Christian‐Albrechts‐Universit?t zu Kiel, 24098 Kiel (Germany) www.ieap.uni‐kiel.de/surface/ag‐kipp;2. Institut für Anorganische Chemie, Christian‐Albrechts‐Universit?t zu Kiel, 24098 Kiel (Germany) www.ac.uni‐kiel.de/tuczek |
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| Abstract: | The electronic structure of the iron(II) spin crossover complex [Fe(H2bpz)2(phen)] deposited as an ultrathin film on Au(111) is determined by means of UV‐photoelectron spectroscopy (UPS) in the high‐spin and in the low‐spin state. This also allows monitoring the thermal as well as photoinduced spin transition in this system. Moreover, the complex is excited to the metastable high‐spin state by irradiation with vacuum‐UV light. Relaxation rates after photoexcitation are determined as a function of temperature. They exhibit a transition from thermally activated to tunneling behavior and are two orders of magnitude higher than in the bulk material. |
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| Keywords: | molecular switches spin crossover thin films ultraviolet photoelectron spectroscopy |
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