Details

Autor(en) / Beteiligte

• Safari, Mohammad Reza
• Matthes, Frank
• Caciuc, Vasile
• Atodiresei, Nicolae
• Schneider, Claus M.
• Ernst, Karl‐Heinz
• Bürgler, Daniel E.

Titel

Enantioselective Adsorption on Magnetic Surfaces

Ist Teil von

• Advanced materials (Weinheim), 2024-04, Vol.36 (14), p.e2308666-n/a

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• From the beginning of molecular theory, the interplay of chirality and magnetism has intrigued scientists. There is still the question if enantiospecific adsorption of chiral molecules occurs on magnetic surfaces. Enantiomer discrimination was conjectured to arise from chirality‐induced spin separation within the molecules and exchange interaction with the substrate's magnetization. Here, it is shown that single helical aromatic hydrocarbons undergo enantioselective adsorption on ferromagnetic cobalt surfaces. Spin and chirality sensitive scanning tunneling microscopy reveals that molecules of opposite handedness prefer adsorption onto cobalt islands with opposite out‐of‐plane magnetization. As mobility ceases in the final chemisorbed state, it is concluded that enantioselection must occur in a physisorbed transient precursor state. State‐of‐the‐art spin‐resolved ab initio simulations support this scenario by refuting enantio‐dependent chemisorption energies. These findings demonstrate that van der Waals interaction should also include spin‐fluctuations which are crucial for molecular magnetochiral processes. Racemic helical aromatic hydrocarbons are sublimed in vacuo onto ferromagnetic cobalt nanoislands. Spin‐ and chirality‐sensitive scanning tunneling microscopy on the single‐molecule scale reveals that molecules of opposite handedness preferentially adsorb on islands with opposite out‐of‐plane magnetization. Enantioselection occurs in a transiently occupied physisorbed precursor state, suggesting that spin‐ and chirality‐sensitive interactions at the van der Waals level play a role.