Self-Assembled Monolayers Based Upon a Zirconium Phosphate Platform
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Organically surface-modified α-zirconium phosphate was obtained by reacting the surface P-O-H groups of α-zirconium phosphate nanoparticles (α-ZrP) with octadecyltrichlorosilane (OTS). Surface functionalization of α-ZrP with OTS was accomplished using a one-step synthesis producing highly hydrophobic nanoparticles. The formation of P-O-Si bonds arising from nucleophilic attack of POH to the silane was confirmed by solid-state NMR experiments. The surface coverage of the organic modifier was characterized by TGA, AFM, and FTIR. In addition, we show the applicability of this system with a photoinduced electron-transfer reaction in a nonpolar solvent. Using an organically surface-modified α-ZrP previously loaded with tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy) 32+ ), the quenching of the luminescence of Ru(bpy) 32+ in the presence of p-benzoquinone was monitored; a static quenching constant (K s ) value of 8.82 × 10 2 M -1 and a dynamic quenching constant (K D ) value of 6.99 × 10 2 M -1 were obtained. © 2013 American Chemical Society.
author list (cited authors)
Díaz, A., Mosby, B. M., Bakhmutov, V. I., Martí, A. A., Batteas, J. D., & Clearfield, A.