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. 2018 Feb 16;4(2):eaaq0582. doi: 10.1126/sciadv.aaq0582

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 2 — (A) Constant current STM image (with a metal tip) of an FeTPP moiety connected to three cGNRs (V_s = 0.21 V and I_t = 16 pA). The corresponding structure (as in Fig. 1C) is superimposed. As in the study of Rubio-Verdú et al. (16), the intact FeTPP fragment has a saddle shape, with two lobes due to two pyrrole units pointing upward (red). (B) Constant height dI/dV map of the same structure as in (A) with CO-terminated tip (V_s = 0 mV, V_ac = 2 mV rms, and R_t ~ 1 gigaohm). Arrows point to new six-membered rings created after CDH step at the contact region. (C) dI/dV spectra taken on the central Fe atom, on the red pyrrole, and on the blue pyrrole (R_t ~ 50 megaohm on site and V_ac = 0.4 mV rms). arb. units, arbitrary units.