Jump to main content
Jump to site search

Issue 30, 2013
Previous Article Next Article

Visible light-harvesting trans bis(alkylphosphine) platinum(II)-alkynyl complexes showing long-lived triplet excited states as triplet photosensitizers for triplet–triplet annihilation upconversion

Author affiliations

Abstract

Symmetric and asymmetric linear trans-bis(tributylphosphine) Pt(II) bis(acetylide) complexes with functionalized aryl alkynyl ligands (coumarin, naphthalimide and phenyl acetylides) were prepared, which show enhanced absorption in the visible region (molar absorption coefficients up to 76 800 M−1 cm−1 at 459 nm) and long-lived triplet excited states (up to 139.9 μs). At room temperature, the naphthalimide acetylide–phenyl acetylide complex (Pt-4) shows dual emission (fluorescence–phosphorescence), whereas other complexes show only fluorescence emission. The triplet excited states of the complexes were studied with nanosecond time-resolved transient difference absorption spectroscopy and DFT calculations on the spin density surface. The complexes were used as triplet photosensitizers for ratiometric O2 sensing, as well as triplet–triplet annihilation (TTA) upconversion (upconversion quantum yield up to 27.2%). The TTA upconversion of the complexes requires triplet acceptors with different T1 state energy levels and was studied with nanosecond time-resolved emission spectroscopy. Our results are useful for designing new Pt(II) complexes that show strong absorption of visible light and long-lived triplet excited states, as well as for the application of these complexes as triplet photosensitizers for O2 sensing, photocatalysis and TTA upconversion.

Graphical abstract: Visible light-harvesting trans bis(alkylphosphine) platinum(ii)-alkynyl complexes showing long-lived triplet excited states as triplet photosensitizers for triplet–triplet annihilation upconversion

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 Feb 2013, accepted on 03 Apr 2013 and first published on 03 Apr 2013


Article type: Paper
DOI: 10.1039/C3DT50496D
Citation: Dalton Trans., 2013,42, 10694-10706
  •   Request permissions

    Visible light-harvesting trans bis(alkylphosphine) platinum(II)-alkynyl complexes showing long-lived triplet excited states as triplet photosensitizers for triplet–triplet annihilation upconversion

    L. Liu, D. Huang, S. M. Draper, X. Yi, W. Wu and J. Zhao, Dalton Trans., 2013, 42, 10694
    DOI: 10.1039/C3DT50496D

Search articles by author

Spotlight

Advertisements