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Probing Magnetism in 2D Molecular Networks after in Situ Metalation by Transition Metal Atoms

2015; American Chemical Society; Volume: 6; Issue: 6 Linguagem: Inglês

10.1021/acs.jpclett.5b00196

1948-7185

Koen Schouteden, Ts. Ivanova, Zhe Li, Violeta Iancu, Ewald Janssens, Chris Van Haesendonck,

Quantum and electron transport phenomena

Metalated molecules are the ideal building blocks for the bottom-up fabrication of, e.g., two-dimensional arrays of magnetic particles for spintronics applications. Compared to chemical synthesis, metalation after network formation by an atom beam can yield a higher degree of control and flexibility and allows for mixing of different types of magnetic atoms. We report on successful metalation of tetrapyridyl-porphyrins (TPyP) by Co and Cr atoms, as demonstrated by scanning tunneling microscopy experiments. For the metalation, large periodic networks formed by the TPyP molecules on a Ag(111) substrate are exposed in situ to an atom beam. Voltage-induced dehydrogenation experiments support the conclusion that the porphyrin macrocycle of the TPyP molecule incorporates one transition metal atom. The newly synthesized Co-TPyP and Cr-TPyP complexes exhibit striking differences in their electronic behavior, leading to a magnetic character for Cr-TPyP only as evidenced by Kondo resonance measurements.