Europium(III) Complex Probing Distribution of Functions Grafted using Molecular Stencil Patterning in 2D Hexagonal Mesostructured Porous Silica
journal contributionposted on 23.06.2009, 00:00 by S. Abry, F. Lux, B. Albela, A. Artigas-Miquel, S. Nicolas, B. Jarry, P. Perriat, G. Lemercier, L. Bonneviot
The “molecular stencil patterning” technique has been used to optimize at high coverage the distribution of aminopropylsilyl tethers (APS) grafted into the nanochannels of a mesostructured MCM-41 type porous silica. To probe this distribution, the APS functions are first derivatized via a Schiff reaction with a 5-substituted 1,10-phenanthroline possessing an aldehyde side arm, and second, reacted with europium(III) ions used as a analytical marker. The integrity of the porous structure has been checked using XRD and N2 adsorption−desorption profiles, whereas the molecular nature of the grafted Eu complex was characterized using 13C NMR, FT-IR, reflectance UV−visible, and luminescence spectroscopies. EDX-TEM measurements at the 1.5 × 1.5 nm resolution scale reveal a rather homogeneous distribution of Eu and, therefore, of APS tethers for several micrometers inside the fibers.