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Silica Nanoparticles for Fluorescence Sensing of Zn II : Exploring the Covalent Strategy
Author(s) -
Teolato Pierluigi,
Rampazzo Enrico,
Arduini Maria,
Mancin Fabrizio,
Tecilla Paolo,
Tonellato Umberto
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600624
Subject(s) - fluorophore , fluorescence , covalent bond , nanoparticle , aqueous solution , quinoline , chemistry , ion , derivative (finance) , substrate (aquarium) , metal ions in aqueous solution , zinc , photochemistry , inorganic chemistry , nanotechnology , materials science , organic chemistry , oceanography , quantum mechanics , geology , financial economics , economics , physics
Silica nanoparticles (about 15 nm diameters), which contain a derivative of 6‐methoxy‐8‐( p ‐toluensulfonamido)‐quinoline (TSQ) as a Zn II fluorescent probe covalently linked to the silica network, were prepared and studied as Zn II fluorescent chemosensors. The systems selectively detect Zn II ions in water rich solutions with a submicromolar sensitivity: 0.13 μ M concentrations of Zn II can be measured with the only interference of Cu II and Cd II ions. Compared with free TSQ, the nanoparticles based systems have the advantage that they can be employed in aqueous solutions without aggregation problems while at the same time, they maintain a similar Zn II affinity and sensing ability. Addition of a second, substrate insensitive, fluorophore to the particles leads to the realization of a ratiometric sensor.