Journal of the Serbian Chemical Society 2004 Volume 69, Issue 5, Pages: 387-392
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Spectroscopic study of the Eu(fod)3 complex adsorbed on a 3-trimethoxypropylthioethylamine modified silica surface
de Farias Robinson F., Alves Severino Jr, Belian Monica F., Vieira Magda R.S., de Souza Jucimar M., Pedrosa Gilmara G., de Sá Gilberto F.
By using 3-mercaptopropyltrimethoxysilane and ethylenediamine as precursors the compound 3-trimethoxypropylhioethylamine was synthesized, and then used as a silylating agent to obrtain, through a sol-gel process, an organicmodification of a silica-gel sample. Asurface thus modified was used as a substrate for the adsorption of the luminescent Eu(fod)3.2H2O complex. Eu(fod)3.2H2O and the silicon hybrid were mixed in stoichiometric amounts to produce samples with 1 %, 5 % and 10 % (m/m) of adsorbed complex. The adsorbed complex was then studied from the spectroscopic point of view. The lifetimes measured for the emission process are 476, 542 and 566 μs for 1 % 5 % and 10 % samples, respectively. Furthermore, comparison with experimental data for n-[3(trimethoxysilyl) propyl]-ethylenediamine modified silica gel surfaces emphasizes the prominenet role of the chemical composition of the silica modified surface on the spectroscopic properties of the adsorbed complex.
Keywords: europium(III) complex, sol-gel, luminescence, hybrids
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