Figure 2.

Absorption and photoswitching behavior of selected Het‐HTIs 1, 5, and 9. a) Molar extinction coefficients. Photographs show cuvettes containing the respective toluene solutions after irradiation to the pss with green (left) and blue light (right). b) Quantified photoswitching of Het‐HTIs using ¹H NMR spectroscopy (from left to right; Het‐HTI 1 (1.95 mm, benzene‐d₆ ), Het‐HTI 5 (4.05 mM, THF‐d₈ ), Het‐HTI 9 (3.85 mM, toluene‐d₈ ). Spectra were recorded after reaching the pss at the indicated wavelengths of irradiation.