{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T01:59:12Z","timestamp":1788832752135,"version":"build-2803163510"},"reference-count":75,"publisher":"Wiley","issue":"49","license":[{"start":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T00:00:00Z","timestamp":1759881600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T00:00:00Z","timestamp":1759881600000},"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":[[2025,12,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Bistability in molecule\u2010based magnets is crucial for their applications in functional devices, and thermally induced excited spin state trapping (TIESST) represents a promising route to maintain two distinct spin states for a significant period of time. Heterospin compounds based on Cu(II) and nitroxide radicals demonstrate highly tunable non\u2010classical spin transitions, nevertheless they did not reveal TIESST effects up to date. Here, we report the first Cu(II)\u2010nitroxide complex that exhibits TIESST\u2010driven bistability up to 116\u00a0K. The TIESST temperature is close to temperatures of the spin transition, which is accompanied by a hysteresis of 30\u00a0K (\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>1\/2\u2191<\/jats:sub>\n                    = 144\u00a0K,\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>1\/2\u2193<\/jats:sub>\n                    = 114\u00a0K). The trapped excited state features a very slow relaxation that exceeds 9\u00a0h at 95\u00a0K. Fast switching is also feasible for this complex: almost complete conversion from the ground to excited state occurs in a single THz pulse within 50\u00a0ms. The slow relaxation and preservation of the crystal quality enabled us to perform an XRD study and demonstrate that the trapped and stable phases coexist during the transition. It was demonstrated, that relaxation of excited state proceeds via an autocatalytic mechanism, previously unreported for spin\u2010crossover systems, which introduces a new paradigm in spin relaxation dynamics.\n                  <\/jats:p>","DOI":"10.1002\/anie.202514043","type":"journal-article","created":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T04:44:13Z","timestamp":1759985053000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Thermomagnetic Bistability, Colossal Negative Thermal Expansion, and THz\u2010Heat\u2010Induced Switching in Cu\u2010Nitroxide Complex"],"prefix":"10.1002","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9892-1614","authenticated-orcid":false,"given":"Kristina","family":"Smirnova","sequence":"first","affiliation":[{"name":"International Tomography Center SB RAS  Institutskaya str., 3a Novosibirsk 630090 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