Abstract
A novel, sulfonyl rhodamine hydrazide chemodosimeter displayed highly selective and sensitive recognition of Cu 2+ in aqueous media, via colour change from colorless to pink. The colour change that occurred as a result of complexation with Cu 2+ can be attributed to spirolactam ring-opening and hydrolysis of the hydrazide unit to afford C.I. Acid Red 52 (Rhodamine B) in the presence of Cu 2+. An analytical method was developed and successfully used for the determination of the copper content in a sample.
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