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Controlling the Conductivity of Oligomer Radical Cations by Tuning Stacking Structures of π‑Dimers
journal contribution
posted on 2019-08-07, 16:37 authored by Xiaoyu Chen, Li Zhang, Shenxin Yao, Gengwen Tan, Xinping WangSalts containing
radical cations of dialkoxyterphenyls (DP) including
4,4′-dimethoxyterphenyl (1) and 4,4′-diethoxyterphenyl
(2) have been isolated with weakly coordinating anions
[Al(ORF)4]− (ORF = OC(CF3)3) or [Al(ORMe)4]− (ORMe = OC(CF3)2CH3) 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.