Journal
DALTON TRANSACTIONS
Volume 42, Issue 30, Pages 10694-10706Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3dt50496d
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Funding
- NSFC [20972024, 21073028, 21273028]
- Science Foundation Ireland (SFI) [11/W.1/E2061]
- Royal Society (UK)
- NSFC (China-UK Cost-Share Science Networks) [21011130154]
- Fundamental Research Funds for the Central Universities [DUT10ZD212]
- Ministry of Education [NCET-08-0077, SRFDP-20120041130005]
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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 mu s). 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 O-2 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 T-1 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 O-2 sensing, photocatalysis and TTA upconversion.
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