Synthesis, structure and photophysics of binuclear gold(I) and mercury(II) complexes derived from 2,5-bis(ethynylphenyl)-1,3,4-oxadiazole

Wai Yeung Wong, Yan He Guo

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12 Citations (Scopus)

Abstract

The organometallic chemistry of the dialkyne ligand 2,5-bis(ethynylphenyl)-1,3,4-oxadiazole with gold(I) and mercury(II) salts has been investigated. Four new group 11 gold(I) and group 12 mercury(II) bis(alkynyl) binuclear complexes functionalized with electron-deficient oxadiazole (OXD) spacer [(PR3)AuC {triple bond, long} C(p-C6H4)(OXD)(p-C6H4)C {triple bond, long} CAu(PR3)] (R = Ph, 1; Me, 2) and [RHgC {triple bond, long} C(p-C6H4)(OXD)(p-C6H4)C {triple bond, long} CHgR] (R = Ph, 3; Me, 4) were prepared in good yields by the base-catalyzed dehydrohalogenation reaction of the corresponding metal chloride precursors with HC {triple bond, long} C(p-C6H4)(OXD)(p-C6H4)C {triple bond, long} CH at room temperature. We report the optical absorption and photoluminescence properties of these metallaynes. The structural properties of 1 have been studied by X-ray crystallography, in which no short-contact aurophilic interaction is observed. The influence of the heavy metal atom on the intersystem crossing rate from the S1singlet excited state to the T1triplet excited state in these metal alkynyl systems and the spatial extent of the lowest singlet and triplet excitons is systematically characterized. Our investigations indicate that harvesting of the organic triplet emissions by the heavy-atom effect of group 11-12 transition metals generally follows the order Au(I) > Hg(II).
Original languageEnglish
Pages (from-to)150-156
Number of pages7
JournalJournal of Molecular Structure
Volume890
Issue number1-3
DOIs
Publication statusPublished - 12 Nov 2008
Externally publishedYes

Keywords

  • Alkynyl
  • Crystal structures
  • Gold
  • Mercury
  • Oxadiazole
  • Phosphorescence

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Inorganic Chemistry

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