Kondo Effect of Co-Porphyrin: Remarkable Sensitivity to Adsorption Sites and Orientations.
basic_science · Level V
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- Record sourced from PubMed, PMID 38150551.
- Also identified by DOI 10.1021/acs.nanolett.3c03669.
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Abstract
We investigated the Kondo effect of cobalt(II)-5-15-bis(4'-bromophenyl)-10,20-bis(4'-iodophenyl)porphyrin (CoTPPBr<sub>2</sub>I<sub>2</sub>) molecules on Au(111) with low-temperature scanning tunneling microscopy under ultrahigh vacuum conditions. The molecules exhibit four adsorption configurations at the top and bridge sites of the surface with different molecular orientations. The Kondo resonance shows extraordinary sensitivity to the adsorption configuration. By switching the molecule between different configurations, the Kondo temperature is varied over a wide range from ≈8 up to ≈250 K. Density functional theory calculations reveal that changes of the adsorption configuration lead to distinct variations of the hybridization between the molecule and the surface. Furthermore, we show that surface reconstruction plays a significant role for the molecular Kondo effect.