Synthesis, light-emitting, and two-photon absorption properties of platinum-containing poly(arylene-ethynylene)s linked by 1,3,4-oxadiazole units

Thomas Goudreault, Ze He, Yanhe Guo, Cheuk Lam Ho, Hongmei Zhan, Qiwei Wang, Keith Yat Fung Ho, Ka Leung Wong, Daniel Fortin, Bing Yao, Zhiyuan Xie, Lixiang Wang, Wai Ming Kwok, Pierre D. Harvey, Wai Yeung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

55 Citations (Scopus)

Abstract

A series of soluble and thermally stable group 10 platinum(II) polyyne polymers of the type [-C≡C-Pt(PBu3)2-C≡C-Ar- Ox-Ar-]n(where Ox = 1,3,4-oxadiazole; Ar = p-C6H4or 2,7-dihexyl-9,9-fluorene) and [-C≡C-Pt(PBu3)2-C≡C-Ar-Ox-Ar-Ox-Ar-]n(where Ar = 2,7-dihexyl-9,9-fluorene) along with their corresponding dinuclear model compounds [Ph-Pt(PEt3)2-C≡C-Ar-]2-Ox- (where Ar = p-C6H4or 2,7-dihexyl-9,9-fluorene) and [Ph-Pt(PEt3)2-C≡C-Ar-Ox-]2-Ar- (where Ar = 2,7-dihexyl-9,9-fluorene) were prepared and characterized. The regiochemical structure of the polymers has been ascertained by single-crystal X-ray analysis on the model compound [Ph-Pt(PEt3)2-C≡C-p-C6H4-]2-Ox-. The photophysical properties (absorption, excitation, emission, and nanosecond transient absorption spectra) of these metalated compounds in 2MeTHF at 298 and 77 K are reported. These findings are correlated by density functional theory (DFT) calculations. Geometry optimizations predict totally planar molecules for these metalated complexes and polymers, allowing better π-conjugation across the main chain. The ligands are strongly fluorescent but become also phosphorescent when the Pt atom is introduced in the backbone of the conjugated organometallic complexes and polymers. These emissions are assigned to ππ* transitions in all cases involving the Pt dxyorbitals. These Pt compounds exhibit two-photon absorption (2PA), and their 2PA cross sections (σ2) have been determined. The potential of exploiting such metallopolymers for the design of electrophosphorescent polymer light-emitting devices (PLEDs) and their use as single-dopant for white PLEDs have also been discussed.
Original languageEnglish
Pages (from-to)7936-7949
Number of pages14
JournalMacromolecules
Volume43
Issue number19
DOIs
Publication statusPublished - 12 Oct 2010

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this