Journal
DALTON TRANSACTIONS
Volume 40, Issue 13, Pages 3257-3268Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0dt01652g
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- Council of Scientific and Industrial Research [NWP0023]
- Council of Scientific & Industrial Research (CSIR), New Delhi
- Brazilian agencies, institutes and networks: CNPq
- Brazilian agencies, institutes and networks: FAPITEC-SE
- Brazilian agencies, institutes and networks: INAMI
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A novel class of efficient visible light sensitized antenna complexes of Eu3+ based on the use of a series of highly conjugated beta-diketonates, namely, 1-(1-phenyl)-3-(2-fluoryl) propanedione, 1-(2-naphthyl)-3-(2-fluoryl) propanedione, 1-(4-biphenyl)-3-(2-fluoryl) propanedione, and 2,2'-bis(di-p-tolylphosphino)-1,1'-binaphthyl oxide as an ancillary ligand has been designed, synthesized, characterized and their photophysical properties investigated. The coordination geometries of the typical Eu3+ complexes were calculated using the Sparkle/PM3 model. Photophysical properties of europium complexes benefit from adequate protection of the metal by the rigid phosphine oxide ligand against non-radiative deactivation and efficient ligand-to-metal energy transfer exceeding 50% as compared to precursor samples. The replacement of the phenyl group with the naphthyl or biphenyl groups in the 3-position of the fluoryl based beta-diketonate ligand remarkably extends the excitation window of the corresponding Eu3+ complexes towards the visible region (up to 500 nm). The highly conjugated beta-diketonate ligands sensitize efficiently the luminescence of Eu3+ ions with quantum yields ranging from 19 to 43 % in the solid state, which is among the highest reported for a visible sensitized Eu3+ complex. The theoretical quantum efficiencies from the Sparkle/PM3 structures are in good agreement with the experimental values, clearly attesting to the efficacy of the theoretical models.
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