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Luminescence Quenching of Eu(III) Carboxylates by Cu(II) in a Composite Polymer Xerogel Film †
Author(s) -
Barja Beatriz C.,
Remorino Amanda,
Aramendía Pedro F.
Publication year - 2006
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1562/2005-07-12-ra-610
Subject(s) - luminescence , aqueous solution , quenching (fluorescence) , materials science , composite number , leaching (pedology) , polymer , porosity , chelation , analytical chemistry (journal) , chemical engineering , fluorescence , inorganic chemistry , composite material , chemistry , metallurgy , optoelectronics , optics , organic chemistry , physics , environmental science , soil science , soil water , engineering
Three Eu(III) luminescent compounds were separately entrapped in a xerogel porous silica matrix and finely ground particles of it were deposited on a glass support with polyvinylacetate (PVAc) as a binder to build a thin film sensor. These 3 devices were immersed in aqueous solutions of Cu(II) and the content of this metal was evaluated by emission‐quenching experiments. The sensor containing the highly luminescent antenna chelate of diethylenetriaminepentaacetic acid (dtpa) sensitized with Coumarin120 rendered the largest Stern‐Volmer constant (K sv = 1.49 × 10 4 M ‐1 ), showing no leaching of the Eu(III) complex to the aqueous solution and a reproducible value of the luminescence ratio between water and Cu(II) solution. The in situ sensor we developed can measure the concentration of Cu(II) in aqueous media down to the ppm level by emission‐quenching experiments. This methodology permits a simple calibration of the sensor and an easy to use reusable device.