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*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

A new series of thermally stable group 10 platinum(II) and group 12 mercury(II) poly-yne polymers containing biphenyl spacer trans-[-Pt(PBu 3)2C≡C(p-C6H4) 2C≡C-]n and [-HgC≡C(p-C6H 4)2C≡C-]n were prepared in good yields by Hagihara's dehydrohalogenation reaction of the corresponding metal chloride precursors with 4,4′-diethynylbiphenyl HC≡C(p-C6H 4)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 T1 triplet excited state.

Original languageEnglish
Pages (from-to)5036-5048
Number of pages13
JournalJournal of Organometallic Chemistry
Volume690
Issue number23
DOIs
Publication statusPublished - 15 Nov 2005

Scopus Subject Areas

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

User-Defined Keywords

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

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