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An illustration showing the fluorescent heteroditopic ligand and its three coordination states. Diamond on top: high-affinity Zn2+ binding site, also the electron donor in photoinduced electron transfer (PET). Nicked rectangle: the fluorophore which contains the low-affinity Zn2+ binding site, shown as the nick. λ – emission wavelength; φ – fluorescence quantum yield; subscripts denote the coordination status. The relevant values of compound 1 in CH3 CN are listed in the parentheses.
