Synthesis, spectroscopy, structures and photophysics of metal alkynyl complexes and polymers containing functionalized carbazole spacers

Li Liu, Wai Yeung WONG*, Jian Xin Shi, Kok Wai CHEAH, Tik Ho Lee, Louis M L LEUNG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

A new class of soluble and thermally stable group 10 platinum(II) poly-yne polymers functionalized with 9-arylcarbazole moiety trans-[-Pt(PBu3)2C{triple bond, long}CRC{triple bond, long}C-]n (R = 9-arylcarbazole-3,6-diyl; aryl = p-methoxyphenyl, p-chlorophenyl) were prepared in good yields by the polycondensation polymerization of trans-[PtCl2(PBu3)2] with HC{triple bond, long}CRC{triple bond, long}CH under ambient conditions. The optical absorption and emission properties of these polymetallaynes were investigated and compared with their bimetallic molecular model complexes trans-[Pt(Ph)(PEt3)2C{triple bond, long}CRC{triple bond, long}CPt(Ph)(PEt3)2] as well as their group 11 gold(I) and group 12 mercury(II) neighbors [(PPh3)AuC{triple bond, long}CRC{triple bond, long}CAu(PPh3)] and [MeHgC{triple bond, long}CRC{triple bond, long}CHgMe]. The structures of all the compounds were confirmed by spectroscopic methods and by X-ray crystallography for selected model complexes. The influence of the heavy metal atom and the 9-aryl substituent of carbazole on the evolution of lowest electronic singlet and triplet excited states is critically characterized. It was shown that the organic-localized phosphorescence emission can be triggered readily by the heavy-atom effect of group 10-12 transition metals (viz., Pt, Au, and Hg) with the emission efficiency generally in the order Pt > Au > Hg. These carbazole-based organometallic materials possess high-energy triplet states of 2.68 eV or higher which do not vary much with the substituent of 9-aryl group.

Original languageEnglish
Pages (from-to)4028-4041
Number of pages14
JournalJournal of Organometallic Chemistry
Volume691
Issue number19
DOIs
Publication statusPublished - 19 Sep 2006

Scopus Subject Areas

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

User-Defined Keywords

  • Acetylide
  • Carbazole
  • Gold
  • Mercury
  • Phosphorescence
  • Platinum

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