Abstract
AbstractCoumarin pyridyl ketone 1 was designed and synthesized as a new chromogenic sensor for transition‐metal ions. Remarkably, the chemosensor showed ion discrimination by exhibiting different extents of bathochromic shifts: 118 nm for Cu2+, 80 nm for Ni2+, and 55 nm for Cd2+. This ion‐dependent redshift in the visible region allows the selective detection of these three transition‐metal ions by the naked eye. Studies of reference compounds and IR and NMR spectroscopy revealed that the pyridyl ketone moiety was the metal‐binding site, whereas the carbonyl group on the coumarin moiety did not participate in the metal‐binding process.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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