DOI

Phosphine ligands, containing chromophore substituents-π-spacer-NPh2 (π-spacer = biphenyl, L1; naphthalene-ethynylphenyl, L2; and ethynyl-(phenylethynyl)anthracene, L3), were used to generate the corresponding gold(i) alkynyl complexes Au1-Au3 (alkynyl = ethynylphenyl-2,2′-bipyridine, epbpy). These compounds demonstrate intense fluorescence, which originates from the bipolar donor-π-Acceptor systems of coordinated phosphines with negligible contribution from the epbpy fragment. Due to the charge transfer characteristic of the excited state, Au1-Au3 reveal significant emission solvatochromism (particularly discernible for Au2, 428 nm in cyclohexane → 580 nm in acetonitrile). The bipyridine moiety of Au1-Au3 was utilized for binding these metalloligands to the {Eu(tta)3} red emitter (tta = 3-Thenoyltrifluoroacetonate) to give a family of novel dyads Au1Eu-Au3Eu. Incomplete energy transfer from L1-L3 to lanthanide ions, which are primarily sensitized by diketonate ligands, leads to dual luminescence. Analogous to the parent complexes Au1-Au3, the fluorescence component of the dyads is highly sensitive to the solvent polarity that provides great opportunities for color tuning, including white light generation.

Original languageEnglish
Pages (from-to)140-149
Number of pages10
JournalInorganic Chemistry Frontiers
Volume7
Issue number1
DOIs
StatePublished - 7 Jan 2020

    Scopus subject areas

  • Inorganic Chemistry

    Research areas

  • WHITE-LIGHT-EMISSION, NEAR-INFRARED LUMINESCENCE, SINGLE ORGANIC-COMPOUND, GENERALIZED-GRADIENT-APPROXIMATION, AGGREGATION-INDUCED EMISSION, ENERGY-TRANSFER, PHOTOPHYSICAL PROPERTIES, CHARGE-TRANSFER, PHOSPHORESCENCE EMISSION, HARNESSING FLUORESCENCE

ID: 50340256