Controlling the Conductivity of Oligomer Radical Cations by Tuning Stacking Structures of π‑Dimers ChenXiaoyu ZhangLi YaoShenxin TanGengwen WangXinping 2019 Salts containing radical cations of dialkoxyterphenyls (DP) including 4,4′-dimethoxyterphenyl (<b>1</b>) and 4,4′-diethoxyterphenyl (<b>2</b>) have been isolated with weakly coordinating anions [Al­(OR<sub>F</sub>)<sub>4</sub>]<sup>−</sup> (OR<sub>F</sub> = OC­(CF<sub>3</sub>)<sub>3</sub>) or [Al­(OR<sub>Me</sub>)<sub>4</sub>]<sup>−</sup> (OR<sub>Me</sub> = OC­(CF<sub>3</sub>)<sub>2</sub>CH<sub>3</sub>) as the counterions. The radical cation salts have been characterized by single-crystal X-ray diffraction analysis, UV–vis absorption, and electron paramagnetic resonance spectroscopy, as well as conductivity measurements. Single-crystal structures indicate that the radical cations assemble into infinite stacks of π-dimer in these salts, while single-crystal conductivity measurements show that the conductivity of the salts is significantly affected by substituent groups and the interaction among the cation, anion, and solvent.