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An effective colorimetric chemosensor, 2,4‐dichloro‐6‐((E)‐(((Z)‐3‐methylbenzo[d]thiazol‐2(3H)‐ylidene)hydrazono)methyl)phenol (HMD), was synthesised for Cu2+ detection. HMD with benzothiazole moiety showed a large bathochromic shift (153 nm) and a definite colour change for Cu2+. HMD could detect Cu2+ down to 0.47 μmol/L in the solution phase and could clearly distinguish it from other metal ions, even in the test strip. The binding mode between HMD and Cu2+ was determined to be 1:1 using Job plot and electrospray ionisation mass spectrometry. The sensing mechanism of HMD for Cu2+ was illustrated as the combination of metal‐to‐ligand charge transfer and intramolecular charge transfer via theoretical calculation.

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