A colorless sensor with pyridyl and carbohydrazide components shows a unique photoresponse when exposed to Fe2+, Cu2+ and Co2+. The sensor's colorimetric response is unique to these metal ions and is stable around neutral pH.

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A highly effective colorimetric chemosensor DPKP, N'-(di (pyridin-2-yl)methylene)-6-hydroxypicolinohydrazide, was synthesized. DPKP sensed Fe 2 + and Co 2 + with the changes of color from colorless to blue and yellow, respectively, without severe inhibition from other metal ions. Binding interactions of DPKP with Fe 2 + and Co 2 + were analyzed to be 1:1 and 2:1 with Job plot and ESI-MS analyses, respectively. In particular, DPKP has low detection limits for Fe 2 + (0.60 μM) and for Co 2 + (0.22 μM).In addition, DPKP could be used for quantification of Fe 2 + and Co 2 + in environmental samples.[a] H.