{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,20]],"date-time":"2026-07-20T11:03:48Z","timestamp":1784545428921,"version":"3.55.0"},"reference-count":33,"publisher":"Wiley","issue":"30","license":[{"start":{"date-parts":[[2026,5,23]],"date-time":"2026-05-23T00:00:00Z","timestamp":1779494400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,5,23]],"date-time":"2026-05-23T00:00:00Z","timestamp":1779494400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Angew Chem Int Ed"],"published-print":{"date-parts":[[2026,7,20]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    The photosalient effect (PE) provides a visually striking demonstration of the direct transduction of light energy into macroscopic mechanical work. However, establishing a predictive, atomic\u2010level understanding of how the underlying crystal packing governs the accumulation and release of macroscopic stress remains a challenge. Here, we report two photoreactive polymorphs of a stilbene\u2010type molecular salt (OHT\u2010T\n                    <jats:sup>I<\/jats:sup>\n                    and OHT\u2010T\n                    <jats:sup>II<\/jats:sup>\n                    ) that undergo the identical topochemical [2\u00a0+\u00a02] photocycloaddition but exhibit divergently different mechanical behaviors: while OHT\u2010T\n                    <jats:sup>II<\/jats:sup>\n                    reacts statically, OHT\u2010T\n                    <jats:sup>I<\/jats:sup>\n                    displays a violent, explosive photosalient actuation. By combining single\u2010crystal x\u2010ray diffraction with advanced periodic density functional theory (DFT) calculations, we reveal the mechanistic origin of this phase\u2010dependent selectivity. We demonstrate that the specific shell\u2010like packing of OHT\u2010T\n                    <jats:sup>I<\/jats:sup>\n                    completely frustrates the structural relaxation of the newly formed cyclobutane dimer, leading to accumulation of elastic strain. Conversely, the uninterrupted stacking in OHT\u2010T\n                    <jats:sup>II<\/jats:sup>\n                    allows for the unhindered dissipation of this strain. Furthermore, the pronounced push\u2013pull character of the chromophore effectively overcomes the traditional reliance on UV light, enabling this actuation to be cleanly triggered by low\u2010energy visible light and, unprecedentedly, via near\u2010infrared two\u2010photon absorption. Supported by complete thermal reversibility, this study provides a predictive structural and computational blueprint for the rational design of next\u2010generation dynamic materials.\n                  <\/jats:p>","DOI":"10.1002\/anie.5518257","type":"journal-article","created":{"date-parts":[[2026,5,23]],"date-time":"2026-05-23T11:57:48Z","timestamp":1779537468000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mechanistic Insight Into the Polymorph\u2010Dependent Photosalient Effect of a White Light or Two\u2010Photon Activated Photoreactive Molecular Salt"],"prefix":"10.1002","volume":"65","author":[{"given":"Emanuela","family":"Santagata","sequence":"first","affiliation":[{"name":"Department of Chemical Sciences University of Naples Federico II Naples Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesco","family":"Ambrosio","sequence":"additional","affiliation":[{"name":"Department 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Cleuvenbergen","sequence":"additional","affiliation":[{"name":"Department of Chemistry Katholieke Universiteit Leuven  Leuven Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1514-5865","authenticated-orcid":false,"given":"Yovan","family":"de Coene","sequence":"additional","affiliation":[{"name":"Department of Chemistry Katholieke Universiteit Leuven  Leuven Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Koen","family":"Clays","sequence":"additional","affiliation":[{"name":"Department of Chemistry Katholieke Universiteit Leuven  Leuven Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paolo Pio","family":"Mazzeo","sequence":"additional","affiliation":[{"name":"Department of Chemistry Life Sciences and Environmental Sustainability University of Parma  Parma Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto","family":"Centore","sequence":"additional","affiliation":[{"name":"Department of Chemical Sciences University of Naples Federico II Naples Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7433-9267","authenticated-orcid":false,"given":"Fabio","family":"Borbone","sequence":"additional","affiliation":[{"name":"Department of Chemical Sciences University of Naples Federico II Naples 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