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Issue 34, 2010
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Highly efficient luminescent hybrid materials covalently linking with europium(iii) complexes via a novel fluorinated β-diketonate ligand: synthesis, characterization and photophysical properties

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Abstract

A novel highly fluorinated β-diketonate ligand, 1-(3,5-bis(benzyloxy)phenyl)-4,4,5,5,5-pentafluoropentane-1,3-dione (HBBPPF) and its corresponding europium(III) ternary complex, Eu(BBPPF)3(DDXPO) [DDXPO = 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene oxide] were synthesized via a dexterously designed routine, characterized and its photophysical properties (PL) investigated. PL measurement results indicated that the europium(III) ternary complex exhibits intense red emission under UV light excitation with a solid-state quantum yield of 39%. An organic–inorganic mesoporous luminescent hybrid material was also constructed by linking the ternary europium(III) complex to the functionalized hexagonal mesoporous MCM-41 through the modified β-diketonate ligand (SiBBPPF-Na). β-Diketonate grafted to the coupling agent 3-(triethoxysilyl)propyl isocyanate was used as the precursor for the preparation of mesoporous materials. A modified MCM-41 mesoporous material containing ternary europium(III) complex covalently bonded to the silica-based network, designated as Eu(BBPPF-Si)3(DDXPO)/MCM-41, was obtained by interacting SiBBPPF-Na with europium nitrate, DDXPO and MCM-41 via a ligand-exchange reaction. The new mesoporous hybrid material was characterized by powder X-ray diffraction, nitrogen adsorption–desorption, thermogravimetry, transmission electron microscopy, dynamic light scattering, FT-IR, 29Si CP MAS NMR and 13C NMR solid-state techniques, and photoluminescence spectroscopy. Eu(BBPPF-Si)3(DDXPO)/MCM-41 exhibits an efficient intramolecular energy transfer process from the silylated β-diketonate to the central Eu3+, namely, the “antenna effect”, which favours a strong luminescent intensity (quantum yield = 43%). Thermogravimetric analysis on Eu(BBPPF-Si)3(DDXPO)/MCM-41 demonstrated that the thermal stability of the lanthanide complex was evidently improved as it was covalently bonded to the mesoporous MCM-41 matrix.

Graphical abstract: Highly efficient luminescent hybrid materials covalently linking with europium(iii) complexes via a novel fluorinated β-diketonate ligand: synthesis, characterization and photophysical properties

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Publication details

The article was received on 15 Apr 2010, accepted on 28 May 2010 and first published on 13 Jul 2010


Article type: Paper
DOI: 10.1039/C0DT00316F
Dalton Trans., 2010,39, 8084-8092

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    Highly efficient luminescent hybrid materials covalently linking with europium(III) complexes via a novel fluorinated β-diketonate ligand: synthesis, characterization and photophysical properties

    B. Francis, D. B. Ambili Raj and M. L. P. Reddy, Dalton Trans., 2010, 39, 8084
    DOI: 10.1039/C0DT00316F

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