Structural and Luminescence Properties of Silica-Based Hybrids Containing New Silylated-Diketonato Europium(III) Complex

Abstract

A new betadiketonate ligand displaying a trimethoxysilyl group as grafting function and a diketone moiety as complexing site (TTA-Si = 4,4,4-trifluoro-2-(3-trimethoxysilyl)propyl)-1-3-butanedione (C4H3S)COCH[(CH2)3Si(OCH3)3]COCF3) and its highly luminescent europium(III) complex [Eu(TTA-Si)3] have been synthesized and fully characterized. Luminescent silica-based hybrids have been prepared as well with this new complex grafted on the surface of dense silica nanoparticles (28 ± 3 nm) or on mesoporous silica particles. The covalent bonding of Eu(TTA-Si)3 inside the core of uniform silica nanoparticles (40 ± 5 nm) was also achieved. Luminescence properties are discussed in relation to the europium chemical environment involved in each of the three hybrids. The general methodology proposed allowed high grafting ratios and overcame chelate release and tendency to agglomeration, and it could be applied to any silica matrix (in the core or at the surface, nanosized or not, dense or mesoporous) and therefore numerous applications such as luminescent markers and luminophors could be foreseen.

Effects of thermal treatment on the structure and luminescent properties of Eu 3+ doped SiO 2 –PMMA hybrid nanocomposites prepared by a sol–gel process

“…A broad band centered at around 3500 cm À 1 and a shoulder at 932 cm À 1 are attributed to Si-OH stretching and indicate that non-condensed silanol groups are also present in the final structure of the hybrid. Absorption bands located at 1191 cm À 1 referring to Si-O-CH 3 rocking vibrations and at 984 cm À 1 associated to Si-O-C scissoring vibrations [27] can be observed indicating the presence of remaining non-hydrolyzed molecules of TMSM.…”

“…The 5 D 0 -7 F 1 oscillator strength was calculated from theory, giving A 0 1 → ¼ 14.65n 3 in s À 1 (here, n ¼1.5) [27]. With these considerations, the expression showed in Eq.…”

Synthesis and Luminescence Properties of the Binary/Ternary Complex of Samarium Ion with Phenacylmethyl P-Tolyl Sulfoxide and Benzoic Acid

“…The ultraviolent spectral were recorded on a TU-1901 double beam spectrophotometer. 1 HNMR spectra were measured on Bruker AC-500 spectrometer in DMSO-d6. Fluorescence spectra and fluorescent lifetime were determined on a FLS920 with the slit width of 1nm.…”

“…Rare earth complexes have attracted much attention for a wide variety of applications in the fields of lighting devices, and biomedical analysis [1,2]. There are numerous examples of luminescent rare earth complexes reported in the literature [3,4].…”

Fluorescent polymeric aggregates induced by Eu3+ ions and their surface morphologies

“…There are several ligands ranging from inorganic compounds, such as SiO 2 , to organic ones like b-diketones and polymers that can function as antenna for rare earth ions [15][16][17]. However, inorganic complexes with lanthanides experience problems for photovoltaic applications, such as poor processability due to insolubility in environmental friendly solvents, poor thermal stability, and weak mechanical strength.…”