Abstract
A new, simple, sensitive and selective spectrofluorimetric method for the determination of Hydrochlorothiazide was developed in acetonitrile at pH 6.2. The Hydrochlorothiazide can remarkably enhance the luminescence intensity of the Tb(3+) ion doped in sol-gel matrix at λ(ex) = 370 nm. The intensity of the emission band of Tb(3+) ion doped in sol-gel matrix was increased due to the energy transfer from the triplet excited state of Hydrochlorothiazide to ((5)D(4)) excited energy state of Tb(3) ion. The enhancement of the emission band of Tb(3+) ion doped in sol-gel matrix at ((5)D(4)→(7)F(5)) 545 nm was directly proportion to the concentration of Hydrochlorothiazide with a dynamic ranges of 5.0 × 10(-10)-5.0 × 10(-6) mol L(-1) and detection limit of 2.2 × 10(-11) mol L(-1).
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