Abstract
Luminescent polynuclear copper(I) alkynyl complexes, including two trinuclear bicapped complexes, [Cu3(μ-dppm)3(μ 3-η 1-C≡CC6H n4 C4H9)2]BF4 (1) and [Cu3(μ-dppm)3(μ 3-η 1-C≡CC6H4C≡CC6H5)2]BF4 (2), as well as two dinuclear complexes, [Cu2(PPh2Me)4(μ 2-η 1-C≡CC6H n4 C4H9)2] (3) and [Cu2(PPh2Me)4(μ 2-η 1-C≡CC6H4C≡CC6H5)2] (4), have been successfully synthesized and characterized. The carbazole moiety has also been incorporated into the alkynyl skeleton to prepare the trinuclear bicapped complex, [Cu3(μ-dppm)3(μ 3-η 1-C≡CC6H4-Cz)2]BF4 (Cz = carbazole) (5). The crystal structure of 3 has also been determined. The complexes exhibit high-energy intraligand (IL) π → π* absorption bands typical of the corresponding phosphine and alkynyl ligands. The complexes show intense luminescence originated from a 3LMCT [RC≡C− → Cu n ] state (n = 2, 3), with mixing of a triplet metal cluster-centered ds/dp state.
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Acknowledgments
V.W.-W.Y. acknowledges support from the University Grants Committee Areas of Excellence Scheme (AoE/P-03/08) and the URC Strategic Research Theme on New Materials. This work has been supported by the ANR-RGC Joint Research Scheme sponsored by the Research Grants Council of Hong Kong and the French National Research Agency (Agence Nationale de la Recherche, ANR) (A-HKU 704/12). S.K.-L.S. acknowledges the receipt of a postgraduate studentship and a University Postgraduate Fellowship, both administered by The University of Hong Kong. V.K.-M.A. acknowledges the receipt of a postdoctoral fellowship administered by The University of Hong Kong. Dr. K.M. Ng at The University of Hong Kong is acknowledged for his helpful technical assistance in the HR-ESI–MS characterization.
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Siu, S.KL., Ko, CC., Au, V.KM. et al. Synthesis, Characterization and Photophysical Studies of Luminescent Dinuclear and Trinuclear Copper(I) Alkynyl Phosphines. J Clust Sci 25, 287–300 (2014). https://doi.org/10.1007/s10876-013-0648-2
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DOI: https://doi.org/10.1007/s10876-013-0648-2