Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 122, Issue 2, Pages 347-350Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2006.07.010
Keywords
diaryl-oxadiazole-aza-crown synthesis; optical spectral studies; fluorescence; photoinduced electron transfer; Mg2+ sensor
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Synthesis of fluoroionophores MOX and BOX incorporating one and two monoaza-15-crown-5, respectively, on photoemittive diaryl-1,3,4-oxadiazoles is reported. Neither absorption nor emission spectra of MOX and BOX were significantly altered in the presence of alkali metal ions. However, alkaline-earth metal ions, Mg2+, Ca2+ and Ba2+ produced high fluorescence enhancements, the order of enhancement being Mg2+ > Ca2+ > Ba2+. BOX, which is a poor emitter (Phi(f) = 0.039) than MOX (Phi(f) = 0.065) experienced the highest emission revival by 24-folds upon Mg2+ complexation. Potential, therefore is available in BOX to function as a sensitive Mg2+ sensor in biological systems. (c) 2006 Elsevier B.V. All rights reserved.
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