For the photocatalysis, the previously established conditions were used, namely a 6:3:1 solvent mixture (v:v:v, acetonitrile: TEA: water). The catalytic solution (8 mL, 50 µM catalyst) was sealed in a Schlenk tube using a silicon rubber septum in an Ar-filled glovebox and irradiated using four LED strips equipped with blue LEDs (470±20 nm, 45±5 mW•cm -1 ) which were anchored in a 3Dprinted setup to keep them in equal fixed positions during all catalytic experiments (for more details see SI in Chapter 10). For every data point, a sample of 100 µL was drawn from the headspace of the solution using a gas-tight syringe and injected into a calibrated GC apparatus. This way, the amount of hydrogen was extracted, which is depicted in Figure and the catalytic experiments were continued until the production of hydrogen had ceased.