Chemodosimetric Detection of the Acetate Anion by Using the Template Reaction Method via a Fluorescence “Turn-Off” Signal

The compartmental ligand 2,6-bis[2-(N-ethyl)thiopheneiminomethyl]- 4-chlorophenol (HL) undergoes Cu(ClO4)2 induced partial hydrolysis to yield a monoamine ligand 4-chloro-2-formyl-6-[2-(thiophen-2-yl)ethyliminomethyl]- phenol (HL ). On further reaction with Cu(ClO4)2, HL produces a dinuclear complex, [Cu2(L )2(ClO4)2] (2), which has been characterized in solution by UV/Vis, ATR, NMR, and ESI-MS spectral techniques and in the solid state by X-ray single-crystal structure analysis. The in situ generated 2 is highly fluorescent.