Fig. 2.

The host–guest interactions between Zn–TCTA and substrate/reagent. a Normalized absorption and emission spectra of Zn–TCTA (ν^0–0 = 19,274 cm⁻¹, E^0–0 = 2.39 eV) and MOF−150 (ν^0–0 = 23,468 cm⁻¹, E^0–0 = 2.91 eV) excited at 390 and 350 nm, respectively. b Fluorescence spectrum of Zn–TCTA upon the addition of trifluoromethanesulfonyl chloride (TfCl) and the corresponding simulated Stern–Volmer curve (inset of b) excited at 390 nm; the intensity was recorded at 546 nm. c ¹H NMR spectrum of the crystals of Zn−TCTA and 1a@Zn−TCTA (digested in DMSO-d₆/DCl). Peaks marked with inverted red triangles represent the aromatic signals of the encapsulated substrate 1a. d Comparison of the infrared (IR) spectrum of 1a (red line), Zn−TCTA (black line), and 1a@Zn−TCTA (blue line)