Development of 1,2- and 1,3-Ketohydrazones Derived Rhodamine Chromophores Sensitive to Metal Ions and pH
New Rhodamine derivatives were developed from ketohydrazones. 2,4-Pentanedione and 1,3-cyclohexanedione condensation of rhodamine-hydrazine afforded a stable enol hydrazone and enamine rhodamines via equilibrium shifts. Enamine rhodamine exhibited strong pH sensitivity. 2-Cyclohexanedione
rhodamine emitted a strong fluorescence as a selective Al3+ sensing probe. The binding constants of the enol hydrazone rhodamine were 2.0 × 104 M-1 (Al3+) and 5.4 × 104 (Cu2+).
Keywords: Al3+ Detection; Fluorescence; Ketohydrazone; Rhodamine Chemosensor
Document Type: Research Article
Affiliations: 1: Department of Chemical Materials, Pusan National University, Busan 46241, Korea 2: Department of Chemistry Education, Pusan National University, Busan 46241, Korea
Publication date: 01 August 2017
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