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Herein a string of binuclear Cu(I) complexes bearing pronounced cuprophilic interactions have been designed and synthesized. [Cu<jats:sub>2<\/jats:sub>(dppb)<jats:sub>2<\/jats:sub>(<jats:italic>\u03bc<\/jats:italic><jats:sub>2<\/jats:sub>\u2010<jats:italic>\u03b7<\/jats:italic><jats:sup>1<\/jats:sup>\u2010C\u2261C\u2212Ph)<jats:sub>2<\/jats:sub>] (<jats:bold>1\u2009a<\/jats:bold>) and [Cu<jats:sub>2<\/jats:sub>(dppb)<jats:sub>2<\/jats:sub>(<jats:italic>\u03bc<\/jats:italic><jats:sub>2<\/jats:sub>\u2010<jats:italic>\u03b7<\/jats:italic><jats:sup>1<\/jats:sup>\u2010C\u2261C\u2212PPXZ)<jats:sub>2<\/jats:sub>] (<jats:bold>1\u2009b<\/jats:bold>) display photoluminescence quantum yields of up to 67\u2009% in doped films and solid states via TADF and exhibit reversible bicolor luminescence switching upon mechanical stimuli. Computational studies manifest that the metal\u2010to\u2010ligand charge transfer predominant transitions ensure a small energy splitting (\u0394<jats:italic>E<\/jats:italic><jats:sub>ST<\/jats:sub>) between the lowest singlet (S<jats:sub>1<\/jats:sub>) and triplet (T<jats:sub>1<\/jats:sub>) excited states and cuprophilic interactions promote the spin\u2010orbit coupling (SOC), favoring the reverse intersystem crossing (RISC) process. This study provides a new strategy for the construction of stimuli\u2010responsive metal\u2010based TADF materials.<\/jats:p>","DOI":"10.1002\/chem.202304224","type":"journal-article","created":{"date-parts":[[2024,2,27]],"date-time":"2024-02-27T23:45:20Z","timestamp":1709077520000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Thermally Activated Delayed Fluorescent Binuclear Copper(I) Alkynyl Complexes with Cuprophilic Interactions"],"prefix":"10.1002","volume":"30","author":[{"given":"Xi","family":"Zhang","sequence":"first","affiliation":[{"name":"Key Laboratory of Photochemical Conversion and Optoelectronic Materials &amp; CAS-HKU Joint Laboratory on New Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences  Beijing 100190 P.R. China"},{"name":"University of Chinese Academy of Sciences  Beijing 100049 P.R. 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