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Emission spectroscopic titrations of 7•7 (1.00 × 10−6 M in anhydrous THF) involving the incremental addition of up to 600 equiv of oxalic acid (a), maleic acid (b), and malonic acid (c), and 100 equiv of TBAF (d) at 298 K. An excitation wavelength (λex) of 320 nm was used in all cases. Insets: Photographs of the host-based emission as seen in the presence of the indicated guests with irradiation provided by a 365 nm UV lamp.
