Amphiphilic porphyrin film on glass as a simple and selective solid-state chemosensor for aqueous Hg2+.
Deposition of amphiphilic porphyrin derivatives occurs spontaneously on silanised glass surfaces, in a controlled fashion. The resulting porphyrin films show appreciable fluorescence emission. This emission can be effectively quenched by immersion of the slides into a diluted solution of Hg(2+) (microM concentration). The initial intensity can be restored by washings with a solution of N,N,N',N'-tetrakis(2-pyridilmethyl)ethylenediammine with no loss of efficiency. A remarkable selectivity is featured toward the detection of Hg(2+) over Cu(2+), Cd(2+), Pb(2+) and Zn(2+) counterparts. This protocol can be extended to a flow-through apparatus. The presented results are of importance for the achievement of a solid-state chemosensor for mercuric ions, at micromolar concentration, in water.
Dolci
Luisa S
LS
Dipartimento di Chimica G. Ciamician, Università di Bologna, Via Selmi 2, 40126 Bologna, Italy.
Marzocchi
Ettore
E
Montalti
Marco
M
Prodi
Luca
L
Monti
Donato
D
Di Natale
Corrado
C
D'Amico
Arnaldo
A
Paolesse
Roberto
R
D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005898:Glass / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008163:Luminescent Measurements / Q000295:instrumentation*; D008628:Mercury / Q000032:analysis*; D011166:Porphyrins / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D020099:Coated Materials, Biocompatible; D011166:Porphyrins; D014874:Water Pollutants, Chemical; D014867:Water; D008628:Mercury