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Squaramide-based reagent for selective chromogenic sensing of Cu(II) through a zwitterion radical.

Organic letters (2010-08-10)
Elena Sanna, Luis Martínez, Carmen Rotger, Salvador Blasco, Jorge González, Enrique García-España, Antoni Costa
RESUMEN

A minimalist squaramide-based chemodosimeter for Cu(2+) is described. Upon selective chelation to 2, Cu(2+) induces the formation of a highly colored zwitterionic radical, which is kinetically stable for hours. The presence of a radical is confirmed by EPR and ESI-MS. It is then possible to use reagent 2 for visual and selective sensing of Cu(2+) at neutral pH.

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Sigma-Aldrich
3,4-Dihydroxy-3-cyclobutene-1,2-dione, ≥99.0% (HPLC)