Synthesis, characterization and photoluminescence of dimeric and polymeric metallaynes of group 10-12 metals containing conjugation-breaking diphenylmethane unit

Wai Yeung WONG*, Suk Yue Poon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A novel approach based on conjugation interruption was developed for a luminescent and thermally stable platinum(II) polyyne polymer trans-[-Pt(PBu 3) 2C≡C(C 6H 4)CH 2(C 6H 4)C≡C-] n (1) containing the diphenylmethane chromophoric spacer. Particular attention was focused on the photophysical properties of this group 10 polymetallayne and comparison was made to its binuclear model complex trans-[Pt(Ph)(PEt 3) 2C≡C(C 6H 4)CH 2(C 6H 4)C≡CPt(Ph)(PEt 3) 2] (2) and their closest group 11 gold(I) and group 12 mercury(II) neighbors, [MC≡C(C 6H 4)CH 2(C 6H 4)C≡CM] (M = Au(PPh 3) (3), HgMe (4)). The regiochemical structures of these angular-shaped compounds were studied by various spectroscopic analyses. Upon photoexcitation, each of them emits an intense purple-blue fluorescence emission in the near UV region in dilute fluid solutions at room temperature. Harvesting of organic triplet emissions harnessed through the strong heavy-atom effects of group 10-12 transition metals was examined. These metal-containing phenyleneethynylenes spaced by the conjugation-breaking CH 2 unit were found to have high optical gaps and high-energy triplet states. The influence of metal and sp 3-hybridized methylene conjugation-interrupters on the intersystem crossing rate and the spatial extent of the lowest singlet and triplet excitons was fully elucidated. Our investigations indicate that high-energy triplet states in these materials intrinsically give rise to very efficient phosphorescence with fast radiative decays.

Original languageEnglish
Pages (from-to)155-162
Number of pages8
JournalJournal of Inorganic and Organometallic Polymers and Materials
Volume18
Issue number1
DOIs
Publication statusPublished - Mar 2008

Scopus Subject Areas

  • Polymers and Plastics
  • Materials Chemistry

User-Defined Keywords

  • Alkyne
  • Diphenylmethane
  • Metallopolyyne
  • Phosphorescence
  • Transition metal

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