Fig. 2
On-surface synthesis of Fe-NPc and Gd-SNPc. a STM image taken after vapor deposition of a monolayer of the precursor ADN onto Ag(111) at 300 K. c, e STM images taken after subsequent deposition of a low coverage of iron (0.13 ML) and gadolinium (0.06 ML), respectively, on the ADN monolayer followed by annealing to 450 K. b, d, f Magnified views of the samples in a, c, e, respectively. Molecular models of ADN and Fe-NPc are overlaid in b, d. The inset in d shows Fe-NPc imaged with the tunneling parameters U = 1.2 V, I = 0.3 nA. g shows f overlaid with a molecular model of Gd-SNPc. Black spheres represent carbon atoms; blue, nitrogen; white, hydrogen; red, iron; pink, gadolinium. Tunneling parameters: a, b, U = −3.6 V, I = 0.08 nA; c, U = 1.2 V, I = 0.3 nA; d, U = 1.9 V, I = 0.13 nA; e, U = 0.76 V, I = 0.11 nA; f, g, U = −3.6 V, I = 0.11 nA. Scale bars, a, 10 nm; b, d, f, g, 1.5 nm; c, 6 nm; e, 4 nm. h Binding energies of C 1s (gray) and N 1s (blue) XPS signals for ADN multi- and monolayers, Fe-NPc, Gd-SNPc, and polycyanine chains. The original XP spectra are shown in Supplementary Fig. 1
