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Imaging · dataset · 2026

Solvent-Fueled Anion Translocation in Crystalline Phosphonium Salt

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Externally stimulated ion motion within rigid crystalline matrices has significant potential to tune the functional properties of bulk materials but is difficult to control.

Description

Here, we report a diphosphonium diiodide that allows facile solid-state solvent-driven anion translocation, providing a direct optical readout of ionic motion. The dynamic character of anion−π<sup>+</sup> interactions enables reversible reorganization of ion pairs via exchange of co-crystallized solvent.

The relocation of the iodides over the distance of 4.3 Å triggers phase transitions and transforms the configuration of the excited state, thereby switching among locally excited fluorescence (<sup>1</sup>LE), locally excited phosphorescence (<sup>3</sup>LE), and charge-transfer phosphorescence (<sup>3</sup>CT). Consequently, photoluminescence is modulated across an exceptionally wide spectral window from 415 to 650 nm.

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Structural and theoretical investigations reveal that noncovalent interactions with solvent molecules dictate the delicate balance between solvation, hydrogen bonding, and anion−π<sup>+</sup> contacts. The resulting ion-migration-driven phase dynamics enable the conversion of directional solid-state motion into programmable luminescent responses, offering a new platform for sensing, information storage, and adaptive optoelectronic technologies.

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figshareoai:figshare.com:article/338650364 d agoJSON v1
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