Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Poster Session - Organic Molecules on Inorganic Substrates: Electronic, Optical and Other
O 49.3: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/EG
Site selective adsorption and spin state locking of the spin crossover complex Fe(phen)2(NCS)2 on Au(111) — Sumit Beniwal1, •Suchetana Sarkar2, Felix Baier2, Peter A. Dowben1, and Axel Enders1,2 — 1Department of Physics, Universität Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany — 2Department of Physics and Astronomy, University of Nebraska Lincoln, Lincoln, NE 68588, USA
The iron (II) spin crossover complex, Fe(1,10-phenanthroline)2(NCS)2, dubbed Fe-phen, has been studied with scanning tunnelling microscopy under ultra-high vacuum after adsorption on the "herringbone" reconstructed surface of Au (111) for sub-monolayer coverages. The Fe-phen molecules attach, through their NCS-groups, to the Au atoms of the fcc domains of the reconstructed surface only, thereby lifting the herringbone reconstruction. The molecules stack to form 1D chains, which run along the Au [110] directions. Neighboring Fe-phen molecules are separated by approximately 2.65 nm, corresponding to 9 atomic spacings in this direction. The molecular axis, defined by the two phen groups, is aligned perpendicular to the chain axis, along the Au [221] direction, thereby bridging over 5 atomic spacings, in this direction. Experimental evidence suggests that the molecular spins are locked in a mixed state in the sub-monolayer regime at temperatures between 100 K and 300 K. These results further the understanding of how interfaces could be leveraged to manipulate the spin state and the spin crossover in SCO complexes and demonstrate an avenue for the structural patterning of functional molecular films.