A phosphorescent hexa-peri-hexabenzocoronene platinum complex and its time-resolved spectroscopy

Bassem El Hamaoui, Frederic Laquai, Stanislav Baluschev, Jishan Wu*, Klaus Müllen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Photoluminescence properties of photoactive HBCC 8,2 and HBCPt 2 have been studied. The phenylene-ethynyl-Pt moieties were incorporated onto the bromo functions of HBCBr 2 1 via double oxidative addition of Pt(PPh 3 ) 4 to 1 followed by CuI-catalyzed dehydrohalogenation reaction of compound 2 and phenylacetylene to give the desired molecule HBC-Pt 2 . Introduction of platinum-phenylacetylene to the hexa-peri-hexabenzocoronenes (HBC) core enhanced the spin-orbit coupling and decreased the phosphorescence lifetime of the triplet state by three orders of magnitude. Photoluminescence measurements revealed unique phosphorescence emission at room temperature and 77 K. On the other hand, symmetric HBC-C 8,2 , bearing no platinum, revealed different delayed emissions depending on the temperature measurement. At room temperature, delayed fluorescence appeared while at 77 K, only phosphorescence could be observed. The triplet energy level has been tuned between 2.3 and 1.7 eV by varying the HBC core substituents. In consequence, combination of both the heavy-atom effect and the increased intersystem crossing in the novel double platinum-substituted HBC lead to the exclusive emission of phosphorescence without any residues of fluorescence in the prompt and delayed emission spectra.

Original languageEnglish (US)
Pages (from-to)1182-1186
Number of pages5
JournalSynthetic Metals
Volume156
Issue number18-20
DOIs
StatePublished - Nov 1 2006

Keywords

  • HBC
  • Photoluminescence
  • Spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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