Luminescent digold ethynyl thienothiophene and dithienothiophene complexes; their synthesis and structural characterisation

P Li, B Ahrens, N Feeder, P R Raithby, S J Teat, M S Khan

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

A series of protected and terminal dialkynes with extended pi-conjugation through the fused oligothienyl linker unit in the backbone, 2,5-bis(trimethylsilylethynyl)thieno[3,2-b]thiophene 1a, 5,5'-bis(trimethylsilylethynyl)dithieno [3,2-b : 2',3'-d]thiophene 1b, 2,5-bis(ethynyl)thieno[3,2-b]thiophene 2a, 5,5'-bis(ethynyl)dithieno[3,2-b:2',3'-d]thiophene 2b, has been synthesized and characterised. The digold alkynyl complexes [(Ph3P)Au(C=C)(C6H2S2)(C=C)Au(PPh3)] 3a and [(Ph3P)Au(C=C)(C8H2S3)(C=C)Au(PPh3)] 3b have then been prepared by the reaction of two equivalents of Ph3PAuCl and a methanolic KOH solution of 1a and 1b, respectively. The complexes have been characterised spectroscopically. The crystal structures show that the gold centres adopt a linear two-coordinate geometry appropriate for Au(I) complexes. Within the crystals adjacent molecules are linked by Au...S intermolecular interactions in the range 3.48-3.89 Angstrom, but there are no short Au...Au contacts. The absence of Au...Au interactions in solution is confirmed by UV/visible absorption and emission spectroscopy, the spectra being dominated by ligand-centred pi-pi* interactions.
Original languageEnglish
Pages (from-to)874-883
Number of pages10
JournalDalton Transactions
Issue number5
DOIs
Publication statusPublished - 2005

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