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Fluorescence emission spectra for (A) Fe3O4-H@hpbtz in the presence of 7.8 equivalent, 300 μL and (B) MSN-Et3N-IPTMS-hpbtz-f1 in the presence of 15.4 equivalent, 350 μL of various metal ions at λ = 350 and 305 nm, respectively, in ethanol.
