The electronic properties of p-terphenyl derivatives were characterized at the single molecule level using the scanning tunneling microscope-break junction (STM-BJ) technique . The STM-BJ setup consists of a gold tip electrode that is repeatedly moved into and out of contact with a gold substrate electrode in a solution containing molecules, resulting in the continual formation and breakage of single molecule junctions (Supporting Information Section S1). The STM-BJ instrument is automated, and experiments are repeated over an ensemble of >5000 molecules for each experiment. Single molecule conductance data are then analyzed using one-and two-dimensional (1D and 2D) conductance histograms without data selection. The timescale of a single STM-BJ pulling trajectory is in the order of milliseconds , which allows for sampling a range of molecular conformations during a conductance measurement. Prior to understanding the electron transport behavior of singly anchored terphenyl derivatives, we characterized the molecular conductance behavior of the molecular analog with two terminal anchor groups (4,4'-diamino-p-terphenyl), and our results reveal a bimodal conductance distribution, with a prominent high conductance feature and weak low conductance feature, consistent with prior literature 6 (Supplementary Figure ).