Spin-State Patterns in Surface-Grafted Beads of Iron(II) Complexes


  • This work was supported by the Deutsche Forschungsgemeinschaft (SFB 658, “Elementary processes in molecular switches on surfaces”).


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Strung out: FeII complexes containing pairs of planar terdentate N ligands form regular one-dimensional aggregates on highly oriented pyrolytic graphite, on a length scale of hundreds of nanometers. STM spectroscopy was used to probe the molecular conductance and thus the spin state. The distribution of spin states is random in the single-molecule chain, but local cooperativity sets in when the chain is made up of oligonuclear “beads” (see picture).