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Homo-metallic metal alkynyl complexes exhibit interesting catenane structures, but their hetero-metallic catenane counterparts are under-developed. In this work, we report rare examples of bimetallic Au-Cu (DtbpC[triple bond, length as m-dash]C - ligand; Dtbp = 3,5-di- tert -butylphenyl), Au-Ag (  t  BuC[triple bond, length as m-dash]C - ligand), and Au-Cu, Au-Ag (C6-FluoC[triple bond, length as m-dash]C - ligand; C6-Fluo = 9,9-dihexyl-9 H -fluoren-2-yl) complexes as well as a trimetallic Au-Ag-Cu (C6-FluoC[triple bond, length as m-dash]C - ligand) complex, which feature [2]catenane structures. The formation of the [2]catenane structure is significantly affected by the coinage metal ion(s) and change of the structure of the alkynyl ligand. These hetero-metallic [2]catenane structures are strongly luminescent with tunable emission λ  max from 503 to 595 nm and Φ values up to 0.83.

Assembly of strongly phosphorescent hetero-bimetallic and -trimetallic [2]catenane structures based on a coinage metal alkynyl system