Fig. 4. (a) On-surface synthesis of doubly Por-capped GNR hybrids 2(H2)n from Por 3(H2) and DBBA. (b) STM image after the surface reaction at 350 °C on Au(111) (Vs = 0.45 V, It = 80 pA) showing formation of doubly Por-capped GNR 2(H2)0 (dashed red circle) and 2(H2)1 (dashed green circle), and singly Por-capped GNR 1(H2)0 (dashed yellow circle). Close-up STM images of GNR–Por2 hybrids (c) 2(H2)1 (Vs = 0.46 V, It = 100 pA) and (d) 2(H2)2 (Vs = −0.05 V, It = 200 pA) (for the overview STM image of 2(H2)2, see Fig. S2.10†). For a better visualization, the chemical structures of 2(H2)1 and 2(H2)2 are superimposed to the corresponding STM images. (e) Differential conductance dI/dV spectra of GNR–Por22(H2)1 taken at the positions indicated by markers with corresponding colors in (c). Arrows indicate the three most prominent peaks. Grey dI/dV spectrum recorded over Au(111). (f) Constant-current dI/dV maps recorded at the energies indicated by arrows in (e).
