The gold complexes Au(C≡CC6H4C≡CC6H4Me)(PPh3) (3) and {Au(PPh3)}2(μ-C≡CC6H4C≡CC6H4C≡CC6H4C≡C) (6), prepared from the reaction of AuCl(PPh3) with the corresponding terminal or trimethylsilyl protected alkynes, react readily with Ru3(CO)10(μ-dppm) to afford phenylene ethynylene derivatives featuring the Ru3(μ-AuPPh3)(μ-C2R)(CO)7 cluster “end-caps”. The hydrido cluster Ru3(μ-H)(μ-C2C6H4C≡CC6H4Me)(CO)7 (4a) has also been obtained. There are significant differences in the absorption spectra of the organic precursors, the gold complexes and the clusters indicate a mixing of electronic states between the cluster and phenylene ethynylene moieties, while the presence of the Ru3 and in particular Ru3(μ-AuPPh3) cluster end-caps leads to a quenching of the phenylene ethynylene centred emission. The crystallographically determined structures of 3, 4a and Ru3(μ-AuPPh3) (μ-C2C6H4C≡CC6H4Me)(CO)7 (4b) are reported.
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Acknowledgments
We thank One NorthEast for funding this work through the UIC Nanotechnology programme. WMK also gratefully acknowledges funding from the Human Resources Development in Science and Technology Programme, Ministry of Science, Technology and Innovation Malaysia. We thank Horiba-Jobin-Yvon for a loan of the 295 nm laser diodes use in the TCSPC work, and Dr J.C. Collings for a sample of 1-trimethylsilylethynyl-4-ethynyl benzene.
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Dedicated to Professor B.F.G. Johnson, one of the pioneers of cluster chemistry, in recognition of his outstanding contributions to the field.
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Khairul, W.M., Porrès, L., Albesa-Jové, D. et al. Metal Cluster Terminated “Molecular Wires”. J Clust Sci 17, 65–85 (2006). https://doi.org/10.1007/s10876-005-0041-x
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DOI: https://doi.org/10.1007/s10876-005-0041-x