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Despite this, the underlying mechanism driving DE in Cu NCs remains elusive, primarily due to the complexities of excited state processes. Herein, a novel [Cu\n                    <jats:sub>4<\/jats:sub>\n                    (PPh\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    (C\u2261C\u2212\n                    <jats:italic>p<\/jats:italic>\n                    \u2212NH\n                    <jats:sub>2<\/jats:sub>\n                    C\n                    <jats:sub>6<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>3<\/jats:sub>\n                    ]PF\n                    <jats:sub>6<\/jats:sub>\n                    (\n                    <jats:bold>\n                      Cu\n                      <jats:sub>4<\/jats:sub>\n                    <\/jats:bold>\n                    ) NC, shielded by alkynyl and exhibiting DE, was synthesized. Hydrostatic pressure was applied to\n                    <jats:bold>\n                      Cu\n                      <jats:sub>4<\/jats:sub>\n                    <\/jats:bold>\n                    , for the first time, to investigate the mechanism of DE. With increasing pressure, the higher\u2010energy emission peak of\n                    <jats:bold>\n                      Cu\n                      <jats:sub>4<\/jats:sub>\n                    <\/jats:bold>\n                    gradually disappeared, leaving the lower\u2010energy emission peak as the dominant emission. Additionally, the\n                    <jats:bold>\n                      Cu\n                      <jats:sub>4<\/jats:sub>\n                    <\/jats:bold>\n                    crystal exhibited notable piezochromism transitioning from cyan to orange. Angle\u2010dispersive synchrotron X\u2010ray diffraction results revealed that the reduced inter\u2010cluster distances under pressure brought the peripheral ligands closer, leading to the formation of new C\u2212H\u22c5\u22c5\u22c5N and N\u2212H\u22c5\u22c5\u22c5N hydrogen bonds in\n                    <jats:bold>\n                      Cu\n                      <jats:sub>4<\/jats:sub>\n                    <\/jats:bold>\n                    . It is proposed that these strengthened hydrogen bond interactions limit the ligands\u2032 vibration, resulting in the vanishing of the higher\u2010energy peak. In situ high\u2010pressure Raman and vibrationally resolved emission spectra demonstrated that the benzene ring C=C stretching vibration is the structural source of the DE in\n                    <jats:bold>\n                      Cu\n                      <jats:sub>4<\/jats:sub>\n                    <\/jats:bold>\n                    .\n                  <\/jats:p>","DOI":"10.1002\/anie.202401724","type":"journal-article","created":{"date-parts":[[2024,5,1]],"date-time":"2024-05-01T11:44:59Z","timestamp":1714563899000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Vibration\u2010Dependent Dual\u2010Phosphorescent Cu\n                    <sub>4<\/sub>\n                    Nanocluster with Remarkable Piezochromic Behavior"],"prefix":"10.1002","volume":"63","author":[{"given":"Xiao\u2010Jing","family":"Zhang","sequence":"first","affiliation":[{"name":"Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster Materials Green Catalysis Center, and College of Chemistry Zhengzhou University  450001 Zhengzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meng\u2010En","family":"Sun","sequence":"additional","affiliation":[{"name":"Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster Materials Green Catalysis Center, and College of Chemistry Zhengzhou University  450001 Zhengzhou China"},{"name":"College of Material Engineering Henan International Joint Laboratory of Rare Earth Composite Materials Henan University of Engineering  451191 Zhengzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fang","family":"Sun","sequence":"additional","affiliation":[{"name":"School of Chemistry and Chemical Engineering Chongqing Key Laboratory of Theoretical and Computational Chemistry Chongqing University  401331 Chongqing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan","family":"Jin","sequence":"additional","affiliation":[{"name":"Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster Materials Green Catalysis Center, and College of Chemistry Zhengzhou University  450001 Zhengzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xi\u2010Yan","family":"Dong","sequence":"additional","affiliation":[{"name":"Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster Materials Green Catalysis Center, and College of Chemistry Zhengzhou University  450001 Zhengzhou China"},{"name":"College of Chemistry and Chemical Engineering Henan Polytechnic University  454000 Jiaozuo China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Si","family":"Li","sequence":"additional","affiliation":[{"name":"Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster Materials Green Catalysis Center, and College of Chemistry Zhengzhou University  450001 Zhengzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hai\u2010Yang","family":"Li","sequence":"additional","affiliation":[{"name":"Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster Materials Green Catalysis Center, and College of Chemistry Zhengzhou University  450001 Zhengzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaosong","family":"Chen","sequence":"additional","affiliation":[{"name":"Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuchen","family":"Wu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences  100871 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Jiang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences  100871 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6728-0559","authenticated-orcid":false,"given":"Shuang\u2010Quan","family":"Zang","sequence":"additional","affiliation":[{"name":"Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster Materials Green Catalysis Center, and 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