TY - JOUR

T1 - Solvatochromic dual luminescence of Eu-Au dyads decorated with chromophore phosphines

AU - Belyaev, Andrey

AU - Slavova, Sofia O.

AU - Solovyev, Igor V.

AU - Sizov, Vladimir V.

AU - Jänis, Janne

AU - Grachova, Elena V.

AU - Koshevoy, Igor O.

PY - 2020/1/7

Y1 - 2020/1/7

N2 - 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.

AB - 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.

KW - WHITE-LIGHT-EMISSION

KW - NEAR-INFRARED LUMINESCENCE

KW - SINGLE ORGANIC-COMPOUND

KW - GENERALIZED-GRADIENT-APPROXIMATION

KW - AGGREGATION-INDUCED EMISSION

KW - ENERGY-TRANSFER

KW - PHOTOPHYSICAL PROPERTIES

KW - CHARGE-TRANSFER

KW - PHOSPHORESCENCE EMISSION

KW - HARNESSING FLUORESCENCE

UR - http://www.scopus.com/inward/record.url?scp=85077077633&partnerID=8YFLogxK

UR - http://xlink.rsc.org/?DOI=C9QI01015G

UR - http://www.mendeley.com/research/solvatochromic-dual-luminescence-euau-dyads-decorated-chromophore-phosphines

U2 - 10.1039/c9qi01015g

DO - 10.1039/c9qi01015g

M3 - Article

AN - SCOPUS:85077077633

VL - 7

SP - 140

EP - 149

JO - Inorganic Chemistry Frontiers

JF - Inorganic Chemistry Frontiers

SN - 2052-1545

IS - 1

ER -