Optical spectroscopy of platinum and palladium containing poly-ynes

H. F. Wittmann*, R. H. Friend, M. S. Khan, J. Lewis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

120 Citations (Scopus)

Abstract

We present a comparative study of two isostructural platinum and palladium poly-ynes, poly[trans(bis(tributylphosphine))M(1,4) phenylenediethynylene], where M represents either platinum or palladium. Optical excitations are associated with the π-molecular orbitals, and with strong spin-orbit coupling provided by the transition metal, both singlet and triplet excitations can be measured. The platinum and palladium polymers show similar low-temperature photoluminescence and photoinduced absorption spectra, with a blue-shift for the palladium polymer of around 5% for electronic transitions with respect to the platinum polymer. For Pt (Pd) we see strong singlet absorption peaks at 3.26 eV (3.49 eV), and weaker triplet absorption peaks at 2.43 eV (≈2.5 eV) at room temperature. Strong photoluminescence from triplet to ground state peaks at 2.38 eV (2.5 eV), and weak photoluminescence from the excited singlet peaks at 3.06 eV (3.2 eV) at low temperatures. Photoinduced absorption that peaks at 1.49 eV (1.72 eV) is due to transitions within the triplet manifold. Triplet lifetimes at low temperatures of 30 and 200-600 μs are found for the platinum and palladium polymers, respectively.

Original languageEnglish
Pages (from-to)2693-2698
Number of pages6
JournalThe Journal of Chemical Physics
Volume101
Issue number4
DOIs
Publication statusPublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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