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Here, we report organic ionic crystals composed of luminescent cations and chiral anions that undergo crystal\u2010to\u2010crystal transformations through hydration\/dehydration cycling. These transformations induce in situ switching between yellow and red emission, accompanied by complete inversion of CPL handedness. Structural analyses reveal that reversible changes in lattice hydration reorganize the supramolecular architecture from a double\u2010helical hydrogen\u2010bonded framework to a single\u2010helical architecture with opposite helicity, while simultaneously reshaping chromophore packing. Theoretical investigations further show that this structural reconfiguration alters intermolecular electronic delocalization and reorients the electric and magnetic transition dipole moments, with the angle between them crossing the critical 90\u00b0 threshold, thereby accounting for the inversion of both circular dichroism and CPL responses. The reversible optical response is robust over multiple switching cycles, and can be spatially patterned to generate multidomain CPL heterostructures, highlighting its potential for multi\u2010parameter photonic encoding. This work offers fundamental insight into hydration\u2010regulated chiral transfer in molecular crystals, and establishes a design platform for adaptive chiroptical materials.<\/jats:p>","DOI":"10.1002\/anie.8313043","type":"journal-article","created":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T07:45:08Z","timestamp":1790927108000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Water\u2010Mediated Reversible Crystalline Phase Transformation Enables Color Switching and Circularly Polarized Luminescence Handedness Inversion"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-5330-7635","authenticated-orcid":false,"given":"Qiong","family":"Wang","sequence":"first","affiliation":[{"name":"Key Laboratory of Photochemistry Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences  Beijing China"},{"name":"School of Chemical Sciences University of 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