Spectroscopic study of the Eu(fod)3 complex adsorbed on a 3-trimethoxypropylthioethylamine modified silica surface

Abstract

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 organic modification of a silica-gel sample. A surface 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.