Abstract
AbstractAn isopyrazole (4H‐pyrazole)‐embedded nonane‐2,4,6,8‐tetraone derivative was synthesized as a masked‐tetraketone for stepwise and multiple functionalization. The masked‐tetraketone has six possible tautomers, but exists predominantly as a 12π‐electron conjugated keto‐enamine‐imine‐enol form, which was also observed in the solid state by single crystal X‐ray analysis. Stepwise functionalization to introduce metal‐coordination and fluorescence‐enhancement sites into the masked tetraketone furnished a fluorescent chromophore that indicates metal coordination on a microgram scale by considerably changing the solid‐state emission.
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