Evolution of lowest singlet and triplet excited states with transition metals in group 10-12 metallaynes containing biphenyl spacer

Li Liu, Suk Yue Poon, Wai Yeung Wong

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68 Citations (Scopus)


A new series of thermally stable group 10 platinum(II) and group 12 mercury(II) poly-yne polymers containing biphenyl spacer trans-[-Pt(PBu3)2C≡C(p-C6H4)2C≡C-]nand [-HgC≡C(p-C6H4)2C≡C-]nwere prepared in good yields by Hagihara's dehydrohalogenation reaction of the corresponding metal chloride precursors with 4,4′-diethynylbiphenyl HC≡C(p-C6H4)2C≡CH at room temperature. We report the optical spectroscopy of these polymetallaynes and compare the results with their bimetallic model complexes trans-[Pt(Ph)(PEt3)2C≡ C(p-C6H4)2C≡CPt(Ph)(PEt3)2] and [MeHgC≡C(p-C6H4)2C≡CHgMe] as well as the group 11 gold(I) counterpart [(PPh3)AuC≡C(p-C6H4)2C≡ CAu(PPh3)]. The structural properties of all model complexes have been studied by X-ray crystallography. The influence of the heavy metal atom in these metal alkynyl systems on the intersystem crossing rate and the spatial extent of lowest singlet and triplet excitons is systematically characterized. Our investigations indicate that the organic triplet emissions can be harvested by the heavy-atom effect of group 10-12 transition metals (viz., Pt, Au, and Hg) which enables efficient intersystem crossing from the Si singlet excited state to the T1triplet excited state.
Original languageEnglish
Pages (from-to)5036-5048
Number of pages13
JournalJournal of Organometallic Chemistry
Issue number23
Publication statusPublished - 15 Nov 2005
Externally publishedYes


  • Acetylide
  • Biphenyl
  • Crystal structures
  • Transition metal
  • Triplet emission

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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