In situ synthesis of luminescent complexes on amorphous modified silica surfaces

2 In situ synthesis of luminescent complexes on amorphous modified silica surfaces 

Besides the adsorption of previously prepared luminescent complexes on modified amorphous surfaces, it is also possible to synthesize the luminescent species in situ, that is, an organic ligand that will coordinate to the lanthanide cation can be 

The complex [Eu(eta)2 (phen) (H20)2]C1 was synthesized by dissolving the previously prepared complex in a solution of phen (1 1 mohmol) in chloroform. The resulting solution was maintained in reflux for 24 h, and the resulting complex washed with deionized water and dried under vacuum at room temperature for 8 h. 

Organofunctionalized silica was prepared as follows 50 cm of tetraethylortho-silicate (TEOS) was dissolved in 38 cm of 3-chloro(propyl)trimethoxysilane. To the resulting solution, 400 cm of a 0.3 mol dm HCl solution was added. The obtained gel was mechanically stirred for 30 min. The resulting mixture was aged for 24 h, the supernatant was discarded, and 400 cm was deionized water was added. This sequence of operations was repeated three times. The obtained powder was then dried at room temperature in a fume hood and then dried under vacuum at 40°Cfor4h. 

The eta-modified sihca was prepared by reacting the 3-chloropropyl silica with eta by using the same procedure used to the synthesis of eta complex. 

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