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Job’s plot indicating the 2:1 stoichiometry for [Zn2+: Fe3O4-H@hpbtz] (A) and 1:2 for [Zn2+: MSN-Et3N-IPTMS-hpbtz-f1] (B). The total concentration of (L) and Zn2+ is 10 µM (λex = 350 and 305 for Fe3O4-H@hpbtz and MSN-Et3N-IPTMS-hpbtz-f1, respectively).
