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Structural formula of {2‐(5‐oxo‐2,3,4,5‐tetrahydro‐2H‐pyrano‐[3,2‐c]chromen‐2‐yl)‐5,10,15,20‐tetraphenylporphyrinato}zinc(II) (162), caffeine (163), nicotine (164), and cotinine (165). a, b) Naked‐eye picture and under a UV lamp (λ ex=365 nm) of 162 (left) and 162+cotinine (right). c) Hypothetical coordination structure of cotinine as an example of the alkaloids studied and probe 162.
