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Issue 13, 2011
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Tuning of the excitation wavelength from UV to visible region in Eu3+-β-diketonate complexes: Comparison of theoretical and experimental photophysical properties

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Abstract

A novel class of efficient visible light sensitized antenna complexes of Eu3+ based on the use of a series of highly conjugated β-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 β-diketonate ligand remarkably extends the excitation window of the corresponding Eu3+ complexes towards the visible region (up to 500 nm). The highly conjugated β-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.

Graphical abstract: Tuning of the excitation wavelength from UV to visible region in Eu3+-β-diketonate complexes: Comparison of theoretical and experimental photophysical properties

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Publication details

The article was received on 29 Nov 2010, accepted on 12 Jan 2011 and first published on 15 Feb 2011


Article type: Paper
DOI: 10.1039/C0DT01652G
Citation: Dalton Trans., 2011,40, 3257-3268
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    Tuning of the excitation wavelength from UV to visible region in Eu3+-β-diketonate complexes: Comparison of theoretical and experimental photophysical properties

    V. Divya, R. O. Freire and M. L. P. Reddy, Dalton Trans., 2011, 40, 3257
    DOI: 10.1039/C0DT01652G

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