Next, different reaction parameters were optimised using [(Ti-MOF)0.75(IG)0.25] material. More concretely, the effect of the solvent (Table ), the amount of the catalytic material (Table ), and the irradiation source (Figures ) were studied. These experiments showed that the best catalytic performance of [(Ti-MOF)0.75(IG)0.25] was reached using 0.5 mg of the composite, acetonitrile as solvent and a 420 nm LED system for irradiating the reaction. With the optimized conditions in hand, we next studied the scope of the reaction using different aromatic amines (Figure ). Composite [(Ti-MOF)0.75(IG)0.25] was able to catalyse the oxidative coupling of benzyl amines 1 having both electron-donating and electron-withdrawing groups in the aromatic ring, affording the corresponding imines 2 in good yields (52-85%). One of the most important factors to assess in heterogeneous catalysis is the recyclability of the catalyst. For this purpose, the oxidative coupling of benzylamine 1a using [(Ti-MOF)0.75(IG)0.25] under optimized conditions was stopped after 48 h. The material was separated from the reaction mixture by filtration, and it was washed and dried. Then, the recovered material was used for a second reaction run by adding new benzylamine (1a) and solvent, and the reaction is submitted to irradiation. As can be seen in Figure , the catalytic activity of the recovered material is maintained, which indicates not only the recyclability of the composite but also its stability under the photocatalytic conditions.