Metal-metal and ligand-ligand interactions in gold poly-yne systems

Peiyi Li, Birte Ahrens, Ka Ho Choi, Muhammad S. Khan, Paul R. Raithby, Paul J. Wilson, Wai Yeung Wong

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Abstract

The acetylide-functionalised thiophene gold(i) complexes [(PPh 3)Au(C≡C(C4H2S)(C4H 3S))] 1, [(PPh3)Au(C≡C(C4H 2S)C≡C)Au(PPh3)] 2, [(PR3) Au(C≡C(C4H2S)2C≡C)Au(PR 3)] (R = Ph 3, Cy 4) and [(PPh3)Au(CC(C4H 2S)3CC)Au(PPh3)] 5 have been prepared by the reaction of the trimethylsilylethynyl oligothiophene with KOH/MeOH, followed by the addition of a stoichiometric amount of the gold(i) phosphine chloride and NaOMe in MeOH. The products have been characterised spectroscopically and their single crystal X-ray structures determined. In the molecular structures of all the complexes the Au(i) centres adopt the expected linear, two-coordinate geometry, except that in 2 the material forms a polymer through additional Au⋯Au interactions [Au⋯Au 3.2915(10) and 3.2347(9) Å] between the molecular units. With the longer acetylene-functionalised spacer groups no Au⋯Au interactions are present, but hydrogen bonding and π⋯π interactions are of significance. The solution absorption and emission spectra of these complexes have been recorded and the maxima are increasingly red-shifted as the length and planarity of the functionalised spacer groups increases which is consistent with the absorptions and emissions being dominated by ligand-centred π-π* transitions.

Original languageEnglish
Pages (from-to)405-412
Number of pages8
JournalCrystEngComm
Volume4
Issue number69
DOIs
Publication statusPublished - 2002

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Li, P., Ahrens, B., Choi, K. H., Khan, M. S., Raithby, P. R., Wilson, P. J., & Wong, W. Y. (2002). Metal-metal and ligand-ligand interactions in gold poly-yne systems. CrystEngComm, 4(69), 405-412. https://doi.org/10.1039/b202283d