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Fluorescence spectra of P2 quenched by various amounts of (A) Fe3+ (ranging from 0 to 12.6 μM) and (B) Cr3+ (ranged from 0 to 20 μM) in THF. Additionally, plots of the relative intensity of FL ((F0 − F)/F) versus the (C) Fe3+, and (D) Cr3+ concentrations are shown.
