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However, the number of photochromic lanthanide SMMs is scarce. Inspired by a boron\u2010based molecule featuring near\u2010infrared absorption supported by a DTE\u2010containing \u03b2\u2010diketonate ligand (3ThacacH) reported by Vivian Wing\u2010Wah Yam et\u00a0al., in this work, we employed this ligand to lanthanide systems for the first time constructing an air\u2010stable mononuclear Dy(III)\u2010based compound,\n                    <jats:bold>\n                      Dy(o\u20103Thacac)\n                      <jats:sub>3<\/jats:sub>\n                      phen\n                    <\/jats:bold>\n                    . It is a typical zero\u2010field SMM with the anisotropy barrier approaching 100 K. Its reversible photochromic behaviors in solution were determined by UV\u2010Vis absorption and\n                    <jats:sup>1<\/jats:sup>\n                    H NMR spectra. The inevitable byproducts upon UV irradiation combined with the low yield of photocyclization reaction lead to the incomplete photochromism in a solid state. However, distinct relaxation rates of quantum tunneling of the magnetization between\n                    <jats:bold>\n                      Dy(o\u20103Thacac)\n                      <jats:sub>3<\/jats:sub>\n                      phen\n                    <\/jats:bold>\n                    and the irradiated sample were observed, demonstrating the feasibility of using 3ThacacH to modulate magnetodynamics. Meanwhile, this work highlights the vital roles of avoiding photoinduced byproducts, achieving photochromic single\u2010crystal\u2010to\u2010single\u2010crystal transformation, and high yields of photocyclization\/photocycloreversion reaction in elucidating the photo\u2010responsive relaxation mechanism and future device applications.\n                  <\/jats:p>","DOI":"10.1002\/chem.202500527","type":"journal-article","created":{"date-parts":[[2025,3,31]],"date-time":"2025-03-31T08:13:25Z","timestamp":1743408805000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["A Photochromic Dysprosium Compound Supported by \u03b2\u2010Diketone Dithienylethene Ligand"],"prefix":"10.1002","volume":"31","author":[{"given":"Quan","family":"Zhou","sequence":"first","affiliation":[{"name":"State Key Laboratory of Rare Earth Resource Utilization and China\u2010Belarus Belt and Road Joint Laboratory on Advanced Materials and Manufacturing Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. 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China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiao\u2010Lei","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Rare Earth Resource Utilization and China\u2010Belarus Belt and Road Joint Laboratory on Advanced Materials and Manufacturing Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8600-7718","authenticated-orcid":false,"given":"Jinkui","family":"Tang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Rare Earth Resource Utilization and China\u2010Belarus Belt and Road Joint Laboratory on Advanced Materials and Manufacturing Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China"},{"name":"School of Applied Chemistry and Engineering University of Science and Technology of China Hefei 230026 P. R. 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