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Here, we report a pentiptycene\u2010derived nonporous organic solvate (\n                    <jats:bold>1B<\/jats:bold>\n                    ) that exhibits a striking blue \u2192 green \u2192 yellow thermochromic fluorescence sequence through a two\u2010stage crystal\u2010to\u2010crystal transformation. In the first stage, subtle gear\u2010like rotations transiently open a zigzag diffusion pathway, releasing dichloromethane (DCM) and generating a green\u2010emissive phase (\n                    <jats:bold>1G<\/jats:bold>\n                    ). In silicone oil, asymmetric bubble evolution during DCM release drives directional crystal propulsion. A second heating step triggers a \u223c90\u00b0 correlated gear rotation that reconfigures alkyl conformation and anthracene packing, producing excimer\u2010based yellow emission (\n                    <jats:bold>1Y<\/jats:bold>\n                    ). These coupled sequential optical, mechanical, and structural responses reveal a unique paradigm of guest\u2010driven dynamics in nonporous solvate crystals.\n                  <\/jats:p>","DOI":"10.1002\/anie.202521866","type":"journal-article","created":{"date-parts":[[2025,12,4]],"date-time":"2025-12-04T12:27:30Z","timestamp":1764851250000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Blue\u2013Green\u2013Yellow Thermochromic Fluorescence and Bubble\u2010Propelled Crystal Motion Driven by Molecular Gear Rotations"],"prefix":"10.1002","volume":"65","author":[{"given":"Hsu\u2010Chi","family":"Chang","sequence":"first","affiliation":[{"name":"Department of Chemistry National Taiwan University  Taipei City 10617 Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu\u2010Chun","family":"Chuang","sequence":"additional","affiliation":[{"name":"Department of Chemistry National Taiwan University  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