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. Leung

Research output: Journal article publicationJournal articleAcademic researchpeer-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
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

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

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