Synthesis, spectroscopy, and electrochemistry of ionic hosts for organic electronics

• New charge- and ion-transport ionic hosts.
• The hosts are imidazolium-cation-modified heterocycle chromophores.
• The hosts exhibit high-energy optical gap and a wide redox gap.

We report on charge- and ion-transport ionic hosts made from an imidazolium-cation-modified aryl-1,2,4-triazole, phosphineoxide-carbazole, and phosphineoxide. The hosts are white solids that have short-wavelength absorption cut-off at <355 nm (high-energy optical gap of >28,200 cm−1) and that exhibit oxidation at <1.44 V and reduction at >(−2.75) V against ferrocene with a wide redox gap of >3.9 V.

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