Yohei Haketa, Tomoka Inoue, Taichi Abiko, Shunsuke Kobashi, Ryota Sato, Yoichi Kobayashi, Kotaro Matsumoto, Tomoyuki Hamachi, Gaku Fukuhara, Tatsuki Morimoto, Rio Kugizaki, Hiromitsu Maeda
Anion-responsive dipyrrolyldiketone and phenalenyl units covalently linked by a spiroboronium unit form π-electronic cations with orthogonally arranged π-systems. Conformations of the anion-binding unit are dependent on the coexisting counteranions in the solution and solid states. Orthogonally arranged π-electronic cations afford solid-state ion-pairing assemblies via double i π- i π interactions at the dipyrrolyldiketone anion complex and the phenalenyl units. Transient absorption spectra revealed electron transfer from anion-binding π-units to orthogonally arranged π-electronic cations, which could be modulated by the coexisting counteranions. Orthogonally arranged π-electronic cations exhibit pressure-responsive photophysical properties.