INVESTIGADORES
ARAMENDIA Pedro Francisco
congresos y reuniones científicas
Título:
Luminescent Eu(III)-containing xerogel films capable of sensing ions in aqueous solution
Autor/es:
BEATRIZ CARMEN BARJA; PEDRO F. ARAMENDÍA
Lugar:
Bariloche, Río Negro
Reunión:
Congreso; 13th International Conference on Solid Films and Surfaces; 2006
Resumen:
Lanthanide´s luminescent properties make these compounds especially profitable for the design of luminescent materials and chemical sensors [1-2]. Moreover, the emission of Eu (III) complexes is used as a probe to sense the chemical environment in glass films, and gels [3] in which the x-rays diffraction technique can not reveal the structure to the system. [1-2]. Moreover, the emission of Eu (III) complexes is used as a probe to sense the chemical environment in glass films, and gels [3] in which the x-rays diffraction technique can not reveal the structure to the system. In this work we use the sol-gel technique to develop porous films capable of in situ sensing differences in metal concentrations in aqueous solutions by means of luminescence quenching experiments. These materials can be classified in two categories: Class 1 are those which simply include the sensing compound in the matrix while Class 2 are hybrid materials in which the matrix was modified by a covalently attached sensing compound. Class 2 materials prevent the leaching of the sensing material, and are more suitable for the design of in-situ sensors. We developed Class I sensors for Cu (II) ions in silica matrixes capable of reversible detection of the metal in the ppm range in aqueous solution. Class 2 sensors are under study. Ageing or temperature treatment of the films can be monitored either by changes in the Eu (III) emission spectra or by changes in the electronic energy transfer to Eu (III) by antenna complexing agents. [1] S. M. Blair et al. Inorg Chem, 2001, 40, 5860-5867. S. M. Blair et al. Inorg Chem, 2001, 40, 5860-5867. [2] M., Montalti, et al. J. Am. Chem. Soc., 2001, 123, 12694-12695. [3] Reifeld, R., Zigansky E and Gaft M. Molecular Physics 10-20, 102, 11-12, 1319-1330.(2004)
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