Fig. 3. (a) Fluorescence spectra of gold(iii)-MOFs and the unsubstituted terphenyl building unit recorded with an excitation wavelength at 290 nm; (b and c) emission spectra of Me-TPDC-[Au1] and Me-TPDC-[Au2] dissolved in degassed MeCN and emission spectra of UiO-68[Au1]4.5% and UiO-68[Au2]2.6% suspended in MeCN under argon, with an excitation wavelength of 380 nm for (b) and 390 nm for (c); (d) absorption spectrum of Me-TPDC-[Au1] in MeCN and emission spectra of Me-TPDC in MeCN and UiO-68-Me suspended in MeCN; (e) singlet oxygen emission spectra generated by 5,10,15,20-tetraphenylporphyrin (H2TPP) used as a reference and by UiO-68[Au1]4.5% and UiO-68[Au2]2.6% in oxygen-saturated MeCN; (f) emission spectra of UiO-68[Au1]2.4% (suspended in MeCN) in the presence of different concentrations of nitrobenzene (0.0245–0.145 mol dm−3), with an excitation wavelength of 355 nm; inset: plot of emission quenching of UiO-68[Au1]2.4% by nitrobenzene at different concentrations.
