General procedure for the synthesis of tris(dipyrrinato)Al(III) complexes. Synthesis of the tris(dipyrrinato)aluminum(III) complexes was adapted to literature procedures by using aluminum salt for the complexation. In a dry Schlenk tube the corresponding 5-substituted dipyrrin (3 eq.) and AlCl3 (1.2-1.4 eq.) were added and dried under vacuum for 1 h. Then, chloroform was added under argon atmosphere and the resulting slur/solution was degassed with argon for 30 min. DIPEA (3 eq.) was added dropwise and the reaction mixture was stirred overnight at 70 °C under reflux. Color changed from dark yellow/brown to dark red. Then the reaction mixture was allowed to reach r.t. and DCM was added. Organic phase was washed with brine (×2), NaHCO3 (×2) and water (×2), dried over Na2SO4, filtered, and the resulting solution was evaporated in vacuo to give a dark brown/red crude mixture. The product was purified via column chromatography.