{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T19:10:44Z","timestamp":1791313844048,"version":"4.3.1"},"reference-count":54,"publisher":"Wiley","issue":"38","license":[{"start":{"date-parts":[[2024,8,15]],"date-time":"2024-08-15T00:00:00Z","timestamp":1723680000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["22193043"],"award-info":[{"award-number":["22193043"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Angew Chem Int Ed"],"published-print":{"date-parts":[[2024,9,16]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Heat\u2010activated second harmonic generation (SHG) switching materials are gaining interest for their ability to switch between SHG on and off states, offering potential in optoelectronic applications. The novel nonlinear optical (NLO) switch, (C\n                    <jats:sub>5<\/jats:sub>\n                    H\n                    <jats:sub>6<\/jats:sub>\n                    NO)\n                    <jats:sup>+<\/jats:sup>\n                    (CH\n                    <jats:sub>3<\/jats:sub>\n                    SO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sup>\u2212<\/jats:sup>\n                    (4\u2010hydroxypyridinium methylsulfonate, 4HPMS), is a near\u2010room\u2010temperature thermal driven material with a strong SHG response (3.3 \u00d7 KDP), making it one of the most potent heat\u2010stimulated NLO switches. It offers excellent contrast of 13 and a high laser\u2010induced damage threshold (2.5 \u00d7 KDP), with reversibility &gt; 5\u2005cycles. At 73\u2009\u00b0C, 4HPMS transitions from the noncentrosymmetric\n                    <jats:italic>Pna<\/jats:italic>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    room temperature phase (RTP) to the centrosymmetric\n                    <jats:italic>P<\/jats:italic>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    \/\n                    <jats:italic>c<\/jats:italic>\n                    phase, caused by the rotation of the (C\n                    <jats:sub>5<\/jats:sub>\n                    H\n                    <jats:sub>6<\/jats:sub>\n                    NO)\n                    <jats:sup>+<\/jats:sup>\n                    and (CH\n                    <jats:sub>3<\/jats:sub>\n                    SO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sup>\u2212<\/jats:sup>\n                    due to partially thermal breaking of intermolecular hydrogen bonds. The reverse phase change exhibits a large 50\u2009\u00b0C thermal hysteresis. Density functional theory (DFT) calculations show that (C\n                    <jats:sub>5<\/jats:sub>\n                    H\n                    <jats:sub>6<\/jats:sub>\n                    NO)\n                    <jats:sup>+<\/jats:sup>\n                    primarily dictates both the SHG coefficient (\n                    <jats:italic>d<\/jats:italic>\n                    <jats:sub>ij<\/jats:sub>\n                    ) and birefringence (\u25b5\n                    <jats:italic>n<\/jats:italic>\n                    <jats:sub>(Zeiss)<\/jats:sub>\n                    = 0.216 vs \u25b5\n                    <jats:italic>n<\/jats:italic>\n                    <jats:sub>(cal.)<\/jats:sub>\n                    = 0.202 at 546\u2005nm; \u0394\n                    <jats:italic>n<\/jats:italic>\n                    <jats:sub>(Immersion)<\/jats:sub>\n                    = 0.210 vs \u25b5\n                    <jats:italic>n<\/jats:italic>\n                    <jats:sub>(cal.)<\/jats:sub>\n                    = 0.198 at 589.3\u2005nm), while the band gap (\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>g<\/jats:sub>\n                    ) is influenced synergistically by (C\n                    <jats:sub>5<\/jats:sub>\n                    H\n                    <jats:sub>6<\/jats:sub>\n                    NO)\n                    <jats:sup>+<\/jats:sup>\n                    and (CH\n                    <jats:sub>3<\/jats:sub>\n                    SO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sup>\u2212<\/jats:sup>\n                    . Additionally, 4HPMS\u2010RTP also exhibits mechanochromism upon grinding as well as an aggregation\u2010enhanced emission in a mixture of acetone and water.\n                  <\/jats:p>","DOI":"10.1002\/anie.202408551","type":"journal-article","created":{"date-parts":[[2024,6,10]],"date-time":"2024-06-10T21:59:33Z","timestamp":1718056773000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["Remarkable Second Harmonic Generation Response in (C\n                    <sub>5<\/sub>\n                    H\n                    <sub>6<\/sub>\n                    NO)\n                    <sup>+<\/sup>\n                    (CH\n                    <sub>3<\/sub>\n                    SO\n                    <sub>3<\/sub>\n                    )\n                    <sup>\u2212<\/sup>\n                    : Unraveling the Role of Hydrogen Bond in Thermal Driven Nonlinear Optical Switch"],"prefix":"10.1002","volume":"63","author":[{"given":"Zi\u2010Peng","family":"Zhang","sequence":"first","affiliation":[{"name":"Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry Beijing Normal University  Beijing 100875 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Liu","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry Beijing Normal University  Beijing 100875 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui\u2010Xi","family":"Wang","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry Beijing Normal University  Beijing 100875 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuang","family":"Zhao","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry Beijing Normal University  Beijing 100875 P. R. China"},{"name":"Center for Advanced Materials Research Beijing Normal University  Zhuhai 519087 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wen\u2010Jie","family":"He","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry Beijing Normal University  Beijing 100875 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hong\u2010Yu","family":"Chen","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry Beijing Normal University  Beijing 100875 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xue\u2010Bin","family":"Deng","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry Beijing Normal University  Beijing 100875 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li\u2010Ming","family":"Wu","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry Beijing Normal University  Beijing 100875 P. R. China"},{"name":"Center for Advanced Materials Research Beijing Normal University  Zhuhai 519087 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhengyang","family":"Zhou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics Chinese Academy of Sciences  Shanghai 200050 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3693-4193","authenticated-orcid":false,"given":"Ling","family":"Chen","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry Beijing Normal University  Beijing 100875 P. R. China"},{"name":"Center for Advanced Materials Research Beijing Normal University  Zhuhai 519087 P. R. 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