Abstract

CALERO RODRIGUEZ, Pilar; PARDO VICENTE, Teresa; MARTINEZ-MANEZ, Ramón  and  SANCENON GALARZA, Félix. Preparation and characterization of nanoparticle of silica functionaliced with anthracene and thiourea for the recognition of anions. Rev. Soc. Quím. Perú [online]. 2009, vol.75, n.4, pp.453-463. ISSN 1810-634X.

Bi-functionalised hybrid silica nanoparticles have been synthesised, characterised and their optical emission properties in the presence of certain anions in acetonitrile solutions studied. The alkoxysilane derivatives N-butyl-N'-[3-(trimethoxysilyl) propyl] thiourea 1, N-phenyl-N'-[3-(trimethoxysilyl)propyl] thiourea 2 and 3-((anthracen-10 yl) methylthio) propyltriethoxysilane 3 were prepared and used to functionalise LUDOX silica nanoparticles with a mean diameter of 18 ± 2 nm. The functionalization of the nanoparticle surface was carried out by two different approaches: The first approach relies in the consecutive grafting of the two subunits; in this protocol, the nanoparticles were first functionalised with anthracene derivative 3 (solid NA) and then reacted with the corresponding binding sites 1 or 2 resulting in solids NA-Pt₃ and NA-Bt₃. The second approach deals with the simultaneous grafting or 2 and the signalling subunit 3 in different ratios. This method was used for the preparation of nanoparticles NA₁ Pt₁, NA₁ Bt₁, NA₁ Pt₃ and NA₁ Bt₃. Acetonitrile suspensions of NA nanoparticles (5 mg in 20 mL) showed anthracene bands centred at ca. 350, 370 and 390. Upon excitation at 365 nm, the typical emission band with fine structure in the 390-450 nm range was observed. The work is completed with a prospective study of the fluorescence of the prepared nanoparticles in the presence of organic and inorganic anions.

Keywords : anthracene nanoparticles; thiourea; anion.

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