We further characterized the electronic properties of PPF, which contains an electron withdrawing group as opposed to the electron donating group in the methyl substituted terphenyl molecules. PPF exhibits similar electron transport characteristics to PPM (Supplementary Figure ), suggesting that the nature of substituent does not significantly affect the high conductance state. These results indicate that disruption of symmetry in the amino-p-terphenyl derivatives can inhibit the high conductance state. In addition, we also characterized the electronic properties of PPN, PPT, and PPS, which contain thiol, pyridine, and N-methylamino as terminal anchor groups, respectively. The electron transport behavior of PPN, PPT, and PPS (Supplementary Figure ) indicates the absence of a high conductance state in these molecules. PPN exhibits a low conductance state, which is absent or significantly diminished in PPT and PPS, and likely arises due to non-covalent dimeric interactions.