EPR (Supplementary Figs. ) and SQUID (Supplementary Fig. ) measurements provided additional evidence for electron delocalization in ladder molecules, which arises due to their locked molecular architecture. Electron delocalization is likely a key contributor to the observed high conductance values and minimal conductance decay as the molecule length increases. Moreover, in contrast to L1-PF6, N1-PF6 shows a pronounced antiresonance dip (Fig. ) that is consistent with destructive quantum interference, resulting in a diminished electron transmission probability and consequently leading to the suppression of molecular conductance .