Iron(ii) spin crossover films on Au(111): scanning probe microscopy and photoelectron spectroscopy
Alex PronschinskeRobert BruceGeoff LewisYifeng ChenArrigo CalzolariMarco Buongiorno NardelliDavid A. ShultzWei YouDaniel B. Dougherty
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The growth of films of [H2B(pz)2]Fe(II)(bpy) on Au(111) is characterized from the bilayer film to multilayer film regime. Scanning tunneling microscopy shows a transition from a well-ordered, uniform bilayer film to a poorly-ordered film at larger thicknesses. Previous local tunneling spectroscopy and conductance mapping in bilayer films permit the identification of coexisting molecular spin-states at all temperatures. New ultraviolet photoelectron spectroscopy is consistent with this picture and in agreement with the density of states calculated by density functional theory. In thicker films with a polycrystalline morphology, evidence for a more bulk-like change in spin composition as a function of temperature is obtained by observing the reduction in intensity of Fe 2p core level satellites in X-ray photoelectron spectra.Keywords:
Ultraviolet photoelectron spectroscopy
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